1
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Garcia-Arevalo I, Bérard JB, Bieser J, Le Faucheur S, Hubert C, Lacour T, Thomas B, Cossa D, Knoery J. Mercury Accumulation Pathways in a Model Marine Microalgae: Sorption, Uptake, and Partition Kinetics. ACS ES&T WATER 2024; 4:2826-2835. [PMID: 39021579 PMCID: PMC11251459 DOI: 10.1021/acsestwater.3c00795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 04/25/2024] [Accepted: 04/26/2024] [Indexed: 07/20/2024]
Abstract
The accumulation of dissolved mercury (Hg) by phytoplankton is the largest concentration step along aquatic food chains. However, the cell uptake mechanisms remain unclear. In this study, the marine haptophyteTisochrysis lutea, a model phytoplankton species, was examined for its interactions with picomolar levels of dissolved inorganic divalent Hg (iHg) and monomethyl Hg (MMHg). For both these Hg species, the study observed their successive sorption and internalization over time, yielding Hg partition coefficients as well as sorption, uptake, and release rates. These results were integrated into a time-dependent, three-compartment model for marine cellular Hg accumulation that included exposure medium, phycosphere, and internalized mercury. Assuming equilibria and pseudo-first-order kinetics between compartments, this study obtained transfer rates of Hg between compartments. The results provide insight into the phycosphere as an intermediate compartment for Hg species accumulation and quantify its role in the internalization of Hg. Ultimately, the new model and its parametrization were successfully applied to literature data showing Hg cellular accumulation in different groups of marine phytoplankton, lending confidence in its robustness and potential contributions to help model the uptake of Hg in the aquatic food web.
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Affiliation(s)
| | | | - Johannes Bieser
- Institute
of Coastal Research, Helmholtz-Zentrum Hereon, Max-Planck-Str. 1, 21502 Geesthacht, Germany
| | - Séverine Le Faucheur
- Université
de Pau et des Pays de l’Adour, E2S-UPPA, CNRS, IPREM, 64000 Pau, France
| | - Clarisse Hubert
- IFREMER,
PHYTOX Physiology and Toxins of Microalgae, F-44300 Nantes, France
| | - Thomas Lacour
- IFREMER,
PHYTOX Physiology and Toxins of Microalgae, F-44300 Nantes, France
| | - Bastien Thomas
- IFREMER,
CCEM Contamination Chimique des Écosystèmes Marins, F-44300 Nantes, France
| | - Daniel Cossa
- Université
Grenoble Alpes, ISTerre, CS 40700, 38058 Grenoble Cedex 9, France
| | - Joël Knoery
- IFREMER,
CCEM Contamination Chimique des Écosystèmes Marins, F-44300 Nantes, France
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2
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Tian X, Wang Y, Xu T, Guo Y, Bi Y, Liu Y, Liang Y, Cui W, Liu Y, Hu L, Yin Y, Cai Y, Jiang G. Bioconcentration of Inorganic and Methyl Mercury by Algae Revealed Using Dual-Mass Single-Cell ICP-MS with Double Isotope Tracers. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:7860-7869. [PMID: 38647522 DOI: 10.1021/acs.est.3c10884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Algae are an entry point for mercury (Hg) into the food web. Bioconcentration of Hg by algae is crucial for its biogeochemical cycling and environmental risk. Herein, considering the cell heterogeneity, we investigated the bioconcentration of coexisting isotope-labeled inorganic (199IHg) and methyl Hg (201MeHg) by six typical freshwater and marine algae using dual-mass single-cell inductively coupled plasma mass spectrometry (scICP-MS). First, a universal pretreatment procedure for the scICP-MS analysis of algae was developed. Using the proposed method, the intra- and interspecies heterogeneities and the kinetics of Hg bioconcentration by algae were revealed at the single-cell level. The heterogeneity in the cellular Hg contents is largely related to cell size. The bioconcentration process reached a dynamic equilibrium involving influx/adsorption and efflux/desorption within hours. Algal density is a key factor affecting the distribution of Hg between algae and ambient water. Cellular Hg contents were negatively correlated with algal density, whereas the volume concentration factors almost remained constant. Accordingly, we developed a model based on single-cell analysis that well describes the density-driven effects of Hg bioconcentration by algae. From a novel single-cell perspective, the findings improve our understanding of algal bioconcentration governed by various biological and environmental factors.
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Affiliation(s)
- Xiangwei Tian
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences (UCAS), Beijing 100049, China
| | - Ying Wang
- Institute of Environment and Health, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China
| | - Tao Xu
- Institute of Environment and Health, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China
| | - Yingying Guo
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yonghong Bi
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Yanqun Liu
- School of Medicine, Jianghan University, Wuhan 430056, China
- Hubei Key Laboratory of Environmental and Health Effects of Persistent Toxic Substances, School of Environment and Health, Jianghan University, Wuhan 430056, China
| | - Yong Liang
- Hubei Key Laboratory of Environmental and Health Effects of Persistent Toxic Substances, School of Environment and Health, Jianghan University, Wuhan 430056, China
| | - Wenbin Cui
- R&D Center, Shandong Yingsheng Biotechnology Co., Ltd., Beijing 100088, China
| | - Yanwei Liu
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Ligang Hu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yongguang Yin
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences (UCAS), Beijing 100049, China
- Institute of Environment and Health, Hangzhou Institute for Advanced Study, UCAS, Hangzhou 310024, China
- Hubei Key Laboratory of Environmental and Health Effects of Persistent Toxic Substances, School of Environment and Health, Jianghan University, Wuhan 430056, China
| | - Yong Cai
- Laboratory of Environmental Nanotechnology and Health Effect, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - Guibin Jiang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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3
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Santos JP, Li W, Keller AA, Slaveykova VI. Mercury species induce metabolic reprogramming in freshwater diatom Cyclotella meneghiniana. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133245. [PMID: 38150761 DOI: 10.1016/j.jhazmat.2023.133245] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 12/06/2023] [Accepted: 12/10/2023] [Indexed: 12/29/2023]
Abstract
Mercury is a hazardous pollutant of global concern. While advances have been made in identifying the detrimental effects caused by Hg species in phytoplankton, knowledge gaps remain regarding the metabolomic perturbations induced by inorganic mercury (Hg(II)) and monomethylmercury (MeHg) in these organisms. Diatoms represent a major phytoplankton group essential in various global biogeochemical cycles. The current study combined targeted metabolomics, bioaccumulation, and physiological response assays to investigate metabolic perturbations in diatom Cyclotella meneghiniana exposed for 2 h to nanomolar concentrations of Hg(II) and MeHg. Our findings highlight that such exposures induce reprogramming of the metabolism of amino acids, nucleotides, fatty acids, carboxylic acids and antioxidants. These alterations were primarily mercury-species dependent. MeHg exposure induced more pronounced reprogramming of the metabolism of diatoms than Hg(II), which led to less pronounced effects on ROS generation, membrane permeability and chlorophyll concentrations. Hg(II) treatments presented distinct physiological responses, with more robust metabolic perturbations at higher exposures. The present study provides first-time insights into the main metabolic alterations in diatom C. meneghiniana during short-term exposure to Hg species, deepening our understanding of the molecular basis of these perturbations.
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Affiliation(s)
- João P Santos
- University of Geneva, Faculty of Sciences, Earth and Environment Sciences, Department F.-A. Forel for Environmental and Aquatic Sciences, Environmental Biogeochemistry and Ecotoxicology, 66 Blvd Carl-Vogt, CH 1211 Geneva, Switzerland.
| | - Weiwei Li
- Bren School of Environmental Science & Management, University of California, Santa Barbara, CA 93106-5131, United States
| | - Arturo A Keller
- Bren School of Environmental Science & Management, University of California, Santa Barbara, CA 93106-5131, United States
| | - Vera I Slaveykova
- University of Geneva, Faculty of Sciences, Earth and Environment Sciences, Department F.-A. Forel for Environmental and Aquatic Sciences, Environmental Biogeochemistry and Ecotoxicology, 66 Blvd Carl-Vogt, CH 1211 Geneva, Switzerland.
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4
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Li S, Li Z, Wu M, Zhou Y, Tang W, Zhong H. Mercury transformations in algae, plants, and animals: The occurrence, mechanisms, and gaps. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 911:168690. [PMID: 38000748 DOI: 10.1016/j.scitotenv.2023.168690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 11/16/2023] [Accepted: 11/16/2023] [Indexed: 11/26/2023]
Abstract
Mercury (Hg) is a global pollutant showing potent toxicity to living organisms. The transformations of Hg are critical to global Hg cycling and Hg exposure risks, considering Hg mobilities and toxicities vary depending on Hg speciation. Though currently well understood in ambient environments, Hg transformations are inadequately explored in non-microbial organisms. The primary drivers of in vivo Hg transformations are far from clear, and the impacts of these processes on global Hg cycling and Hg associated health risks are not well understood. This hinders a comprehensive understanding of global Hg cycling and the effective mitigation of Hg exposure risks. Here, we focused on Hg transformations in non-microbial organisms, particularly algae, plants, and animals. The process of Hg oxidation/reduction and methylation/demethylation in organisms were reviewed since these processes are the key transformations between the dominant Hg species, i.e., elemental Hg (Hg0), divalent inorganic Hg (IHgII), and methylmercury (MeHg). By summarizing the current knowledge of Hg transformations in organisms, we proposed the potential yet overlooked drivers of these processes, along with potential challenges that hinder a full understanding of in vivo Hg transformations. Knowledge summarized in this review would help achieve a comprehensive understanding of the fate and toxicity of Hg in organisms, providing a basis for predicting Hg cycles and mitigating human exposure.
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Affiliation(s)
- Shouying Li
- School of the Environment, Nanjing University, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing 210023, China
| | - Zhuoran Li
- School of the Environment, Nanjing University, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing 210023, China
| | - Mengjie Wu
- School of the Environment, Nanjing University, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing 210023, China
| | - Yang Zhou
- School of the Environment, Nanjing University, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing 210023, China
| | - Wenli Tang
- School of the Environment, Nanjing University, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing 210023, China.
| | - Huan Zhong
- School of the Environment, Nanjing University, State Key Laboratory of Pollution Control and Resource Reuse, Nanjing 210023, China.
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5
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Sanniyasi E, Gopal RK, Damodharan R, Thirumurugan T, Mahendran V. Bioaccumulation of Titanium in diatom Cyclotella atomus Hust. Biometals 2024; 37:71-86. [PMID: 37566151 DOI: 10.1007/s10534-023-00528-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Accepted: 08/01/2023] [Indexed: 08/12/2023]
Abstract
Diatomaceous earth or diatomite is a fossil rock deposit of diatoms made up of silica and other minerals. A distinguishing feature of diatoms that placed them in the single class of microalgae Bacillariophyceae, is the frustule, a transparent, hard-shelled cell wall. It's interesting to note that the diatom has specific proteins and enzymes for heavy metal detoxification and can intake and store more heavy metals in its frustule. Consequently, an attempt has been made in this study to determine the bioaccumulation of metals in the frustules of the diatom. Hence, a centric diatom was isolated from the freshwater sample collected from the Adyar River, Chennai, Tamil Nadu. The diameter of the cell was 5-7.5 µm and 20-23 striations with radial arrangement. A single, dark off-center fultoportula and marginal fultoportula on the striae are found in the diatom. Additionally, one rimoportula between two marginal fultoportula distributed on the striae between the costa was also seen. As a result, the isolated diatom was morphologically identified as Cyclotella atomus Hust. Simultaneously, the bioaccumulation study reveals that the Titanium (Ti) was found accumulated in the frustules of the diatom incubated in the Ti-supplemented culture medium based on the scanning electron microscope-energy-dispersive X-ray analysis (SEM-EDAX). Therefore, the biogenic accumulation and fabrication of Titanium frustules in diatom have advantages in enhancing the efficiency of solar cells.
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Affiliation(s)
- Elumalai Sanniyasi
- Department of Biotechnology, University of Madras, Guindy Campus, Chennai, 600 025, India.
| | - Rajesh Kanna Gopal
- Department of Microbiology, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences (SIMATS), Chennai, 600077, India
| | - Rajesh Damodharan
- Department of Biotechnology, University of Madras, Guindy Campus, Chennai, 600 025, India
| | - Tarani Thirumurugan
- Department of Biotechnology, Rajalakshmi Engineering College (Autonomous), Thandalam, Chennai, 602 105, India
| | - Vishali Mahendran
- Department of Biotechnology, Rajalakshmi Engineering College (Autonomous), Thandalam, Chennai, 602 105, India
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6
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Millet RT, Santos JP, Slaveykova VI. Exploring the subcellular distribution of mercury in green alga Chlamydomonas reinhardtii and diatom Cyclotella meneghiniana: A comparative study. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2024; 267:106836. [PMID: 38232614 DOI: 10.1016/j.aquatox.2024.106836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 01/09/2024] [Accepted: 01/11/2024] [Indexed: 01/19/2024]
Abstract
Mercury (Hg) is a priority pollutant of global concern because of its toxicity, its ability to bioaccumulate throughout the food web and reach significant concentrations in top predators. Phytoplankton bioconcentrate large amounts of Hg and play a key role in the entry of Hg into the aquatic food web. However, the subcellular distribution of Hg in freshwater phytoplankton, known to affect it toxicity and trophic transfer is understudied. The present study aimed at investigating the accumulation of inorganic Hg (iHg) and its subcellular distribution in freshwater phytoplankton species. To this end green alga Chlamydomonas reinhardtii and diatom Cyclotella meneghiniana were exposed to 10 and 100 nM of iHg for 2 h. The concentrations of Hg in the adsorbed, intracellular and subcellular (granules, debris, organelles, heat-stable peptides (HSP) and heat-denaturable proteins (HDP)) fractions were determined. The results showed that C. meneghiniana accumulated more Hg compared to C. reinhardtii at both iHg exposure concentrations (10 nM: 4.41 ± 0.74 vs. 1.10 ± 0.25 amol cell-1; 100 nM: 79.35 ± 10.78 vs. 38.31 ± 4.15 amol cell-1). The evaluation of the subcellular distribution of Hg, revealed that the majority of Hg was concentrated in the organelles fraction (59.7 % and 74.6 %) in the green algae. In the diatom, Hg was mainly found in the organelles (40.9 % and 33.3%) and in the HSP fractions (26.8 % and 40.1 %). The proportion of Hg in HDP fraction decreased in favor of the organelles fraction in C. reinhardtii when the exposure concentration increased, whereas the proportions in the debris and organelles fractions decreased in favor of HSP fraction in C. meneghiniana. This study provides pioneering information on the subcellular distribution of Hg within in freshwater phytoplankton, a knowledge that is essential to understand the toxicity and trophic transfer of Hg in contaminated aquatic environment.
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Affiliation(s)
- Rémy T Millet
- University of Geneva, Faculty of Sciences, Earth and Environment Sciences, Department F.-A. Forel for Environmental and Aquatic Sciences, Environmental Biogeochemistry and Ecotoxicology, 66 Blvd Carl-Vogt, CH 1211 Geneva, Switzerland
| | - João P Santos
- University of Geneva, Faculty of Sciences, Earth and Environment Sciences, Department F.-A. Forel for Environmental and Aquatic Sciences, Environmental Biogeochemistry and Ecotoxicology, 66 Blvd Carl-Vogt, CH 1211 Geneva, Switzerland
| | - Vera I Slaveykova
- University of Geneva, Faculty of Sciences, Earth and Environment Sciences, Department F.-A. Forel for Environmental and Aquatic Sciences, Environmental Biogeochemistry and Ecotoxicology, 66 Blvd Carl-Vogt, CH 1211 Geneva, Switzerland.
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7
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Negi S, Han T, Park J, Bergey EA, Sangeeta, Chaubey J, Kumar A, Gupta D, Gupta M, Singh S, Pandey LK. Qualitative and quantitative assessment of diatom deformities and protoplasmic condition under metal and metalloid stress. PROTOPLASMA 2023; 260:1501-1513. [PMID: 37212895 DOI: 10.1007/s00709-023-01864-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Accepted: 05/05/2023] [Indexed: 05/23/2023]
Abstract
Metals and metalloids are toxic, persistent, and non-biodegradable and can be biomagnified (e.g., Hg), and therefore pose a serious threat to the algal flora of aquatic ecosystems. This laboratory study tested the effects of metals (Zn, Fe, and Hg) and a metalloid (As) on the cell wall morphology and protoplasmic content of living cells of six widespread diatom genera over 28 days. Diatoms exposed to Zn and Fe had a higher frequency of deformed diatom frustules (> 1%) compared to the As, Hg, and control treatments (< 1%). Deformities in the valve outline and striae were found in all treatments, including the control, whereas deformed raphes and more than one type of deformity were more prevalent under Zn and Hg stress. The order of toxicity is as follows: Zn > Fe > Hg≈As. Deformities were more frequent in Achnanthes and Diploneis (adnate forms) than in the motile genera of Nitzschia and Navicula. The correlation between the % healthy diatoms and % deformities in all six genera showed a negative relationship with the integrity of protoplasmic content (i.e., greater alteration in protoplasmic content was associated with greater frustule deformation). We conclude that diatom deformities can be a good indicator of metal and metalloid stress in waterbodies and are very useful in the rapid biomonitoring of aquatic ecosystems.
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Affiliation(s)
- Sudeeksha Negi
- Department of Plant Science, Faculty of Applied Sciences, MJP Rohilkhand University, Bareilly, 243006, India
| | - Taejun Han
- Bio Environmental Science and Technology (BEST) Lab, Ghent University Global Campus, 119-5, Songdomunhwa-ro, Incheon, 21985, Republic of Korea
- Department of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653-Block F, 9000, Ghent, Belgium
| | - Jihae Park
- Bio Environmental Science and Technology (BEST) Lab, Ghent University Global Campus, 119-5, Songdomunhwa-ro, Incheon, 21985, Republic of Korea
- Department of Animal Sciences and Aquatic Ecology, Ghent University, Coupure Links 653-Block F, 9000, Ghent, Belgium
- Center for Environmental and Energy Research, Ghent University Global Campus, 119-5, Songdomunhwa-ro, Yeonsu-Gu, Incheon, 21985, Republic of Korea
| | - Elizabeth A Bergey
- Oklahoma Biological Survey and Department of Biology, University of Oklahoma, Norman, OK, 73019, USA
| | - Sangeeta
- Department of Plant Science, Faculty of Applied Sciences, MJP Rohilkhand University, Bareilly, 243006, India
| | - Jyoti Chaubey
- Department of Plant Science, Faculty of Applied Sciences, MJP Rohilkhand University, Bareilly, 243006, India
| | - Abhishek Kumar
- Department of Plant Science, Faculty of Applied Sciences, MJP Rohilkhand University, Bareilly, 243006, India
| | - Divyanshi Gupta
- Department of Plant Science, Faculty of Applied Sciences, MJP Rohilkhand University, Bareilly, 243006, India
| | - Mahima Gupta
- Department of Plant Science, Faculty of Applied Sciences, MJP Rohilkhand University, Bareilly, 243006, India
| | - Shivangi Singh
- Department of Plant Science, Faculty of Applied Sciences, MJP Rohilkhand University, Bareilly, 243006, India
| | - Lalit Kumar Pandey
- Department of Plant Science, Faculty of Applied Sciences, MJP Rohilkhand University, Bareilly, 243006, India.
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8
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Gojkovic Z, Simansky S, Sanabria A, Márová I, Garbayo I, Vílchez C. Interaction of Naturally Occurring Phytoplankton with the Biogeochemical Cycling of Mercury in Aquatic Environments and Its Effects on Global Hg Pollution and Public Health. Microorganisms 2023; 11:2034. [PMID: 37630594 PMCID: PMC10458190 DOI: 10.3390/microorganisms11082034] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2023] [Revised: 08/02/2023] [Accepted: 08/05/2023] [Indexed: 08/27/2023] Open
Abstract
The biogeochemical cycling of mercury in aquatic environments is a complex process driven by various factors, such as ambient temperature, seasonal variations, methylating bacteria activity, dissolved oxygen levels, and Hg interaction with dissolved organic matter (DOM). As a consequence, part of the Hg contamination from anthropogenic activity that was buried in sediments is reinserted into water columns mainly in highly toxic organic Hg forms (methylmercury, dimethylmercury, etc.). This is especially prominent in the coastal shallow waters of industrial regions worldwide. The main entrance point of these highly toxic Hg forms in the aquatic food web is the naturally occurring phytoplankton. Hg availability, intake, effect on population size, cell toxicity, eventual biotransformation, and intracellular stability in phytoplankton are of the greatest importance for human health, having in mind that such Hg incorporated inside the phytoplankton cells due to biomagnification effects eventually ends up in aquatic wildlife, fish, seafood, and in the human diet. This review summarizes recent findings on the topic of organic Hg form interaction with natural phytoplankton and offers new insight into the matter with possible directions of future research for the prevention of Hg biomagnification in the scope of climate change and global pollution increase scenarios.
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Affiliation(s)
- Zivan Gojkovic
- Algae Biotechnology Group, CIDERTA, University of Huelva, 21007 Huelva, Spain; (A.S.); (I.G.); (C.V.)
| | - Samuel Simansky
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic; (S.S.); (I.M.)
| | - Alain Sanabria
- Algae Biotechnology Group, CIDERTA, University of Huelva, 21007 Huelva, Spain; (A.S.); (I.G.); (C.V.)
| | - Ivana Márová
- Faculty of Chemistry, Brno University of Technology, Purkynova 118, 61200 Brno, Czech Republic; (S.S.); (I.M.)
| | - Inés Garbayo
- Algae Biotechnology Group, CIDERTA, University of Huelva, 21007 Huelva, Spain; (A.S.); (I.G.); (C.V.)
| | - Carlos Vílchez
- Algae Biotechnology Group, CIDERTA, University of Huelva, 21007 Huelva, Spain; (A.S.); (I.G.); (C.V.)
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9
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Wu Y, Zhao Y, Liu Y, Niu J, Zhao T, Bai X, Hussain A, Li YY. Insights into heavy metals shock on anammox systems: Cell structure-based mechanisms and new challenges. WATER RESEARCH 2023; 239:120031. [PMID: 37172374 DOI: 10.1016/j.watres.2023.120031] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 01/31/2023] [Accepted: 05/01/2023] [Indexed: 05/14/2023]
Abstract
Anaerobic ammonium oxidation (anammox) as a low-carbon and energy-saving technology, has shown unique advantages in the treatment of high ammonia wastewater. However, wastewater usually contains complex heavy metals (HMs), which pose a potential risk to the stable operation of the anammox system. This review systematically re-evaluates the HMs toxicity level from the inhibition effects and the inhibition recovery process, which can provide a new reference for engineering. From the perspective of anammox cell structure (extracellular, anammoxosome membrane, anammoxosome), the mechanism of HMs effects on cellular substances and metabolism is expounded. Furthermore, the challenges and research gaps for HMs inhibition in anammox research are also discussed. The clarification of material flow, energy flow and community succession under HMs shock will help further reveal the inhibition mechanism. The development of new recovery strategies such as bio-accelerators and bio-augmentation is conductive to breaking through the engineered limitations of HMs on anammox. This review provides a new perspective on the recognition of toxicity and mechanism of HMs in the anammox process, as well as the promotion of engineering applicability.
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Affiliation(s)
- Yichen Wu
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Yingxin Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
| | - Yinuo Liu
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Jiaojiao Niu
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Tianyang Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Xinhao Bai
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Arif Hussain
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Yu-You Li
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan; Department of Frontier Sciences for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, 6-6-20 Aoba, Aramaki-Aza, Sendai, Miyagi 980-8579, Japan.
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10
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Han M, Xie Y, Wang R, Li Y, Bian C, Xia S. 4-Mercaptopyridine-Modified Sensor for the Sensitive Electrochemical Detection of Mercury Ions. MICROMACHINES 2023; 14:739. [PMID: 37420972 DOI: 10.3390/mi14040739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 03/16/2023] [Accepted: 03/25/2023] [Indexed: 07/09/2023]
Abstract
As a highly toxic heavy metal ion, mercury ion (Hg2+) pollution has caused serious harm to the environment and human health. In this paper, 4-mercaptopyridine (4-MPY) was selected as the sensing material and decorated on the surface of a gold electrode. Trace Hg2+ could be detected by both differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) methods. The proposed sensor displayed a wide detection range from 0.01 μg/L to 500 μg/L with a low limit of detection (LOD) of 0.002 μg/L by EIS measurements. Combined with molecular simulations and electrochemical analyses, the chelating mechanism between Hg2+ and 4-MPY was explored. Through the analysis of binding energy (BE) values and stability constants, 4-MPY showed an excellent selectivity for Hg2+. In the presence of Hg2+, the coordination of Hg2+ with the pyridine nitrogen of 4-MPY was generated at the sensing region, which caused a change in the electrochemical activity of the electrode surface. Due to the strong specific binding capability, the proposed sensor featured excellent selectivity and an anti-interference capability. Furthermore, the practicality of the sensor for Hg2+ detection was validated with the samples of tap water and pond water, which demonstrated its potential application for on-site environmental detection.
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Affiliation(s)
- Mingjie Han
- State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Yong Xie
- State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Ri Wang
- State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100190, China
| | - Yang Li
- State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
| | - Chao Bian
- State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
| | - Shanhong Xia
- State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
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11
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Qin F, Amyot M, Bertolo A. The relationship between zooplankton vertical distribution and the concentration of aqueous Hg in boreal lakes: A comparative field study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 858:159793. [PMID: 36374726 DOI: 10.1016/j.scitotenv.2022.159793] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 10/23/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
The production of the highly toxic monomethylmercury (MeHg) is heterogenous throughout the water column. Multiple factors have been identified to significantly affect this process, such as an extended anoxic water layer and a deep-water phytoplankton maximum. However, the role of water column heterogeneity on mercury (Hg) cycling is still poorly known, especially concerning the role of zooplankton grazers. Here, four boreal lakes with contrasting characteristics were sampled (i.e., transparency and the presence/absence of fish) at both day and night in order to maximize the heterogeneity in zooplankton abundance both among and within lakes, and to investigate their potential links with Hg vertical heterogeneity. Diel variation of the concentrations of both dissolved total Hg (DTHg) and total Hg (THg) were observed, with night samples significantly higher than day samples. Although this pattern was not related to diel changes in the vertical distribution of zooplankton, results showed that the presence of large copepods (>1.2 mm) and medium-sized (0.6 to 1.2 mm) cladocerans was significantly associated with lower concentrations of DTHg in the water at a given depth, whereas the presence of medium-sized copepods was significantly associated with the concentration of THg. The presence of cladocerans was significantly associated with the ratio between the dissolved MeHg and DTHg (conventionally used as a proxy of methylation potential). Phytoplankton biomass was directly correlated with the concentration of both dissolved and total MeHg and the methylation potential. At the same time, phytoplankton biomass was inversely related to the fraction of DTHg. These results suggest a potential key role of the heterogeneity of biotic factors in the water column, especially of phytoplankton and zooplankton, in the cycling of total Hg and MeHg in boreal lakes.
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Affiliation(s)
- Fan Qin
- Centre de recherche sur les interactions bassins versants-écosystèmes aquatiques (RIVE) et Département des sciences de l'environnement, Université du Québec à Trois-Rivières, 3351 Boul. des Forges, C.P. 500, Trois-Rivières, QC G8Z 4M3, Canada; Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Université de Montréal, Campus MIL, C.P. 6128, Succ. Centre-ville, Montréal, QC H3C 3J7, Canada.
| | - Marc Amyot
- Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Université de Montréal, Campus MIL, C.P. 6128, Succ. Centre-ville, Montréal, QC H3C 3J7, Canada; Département de sciences biologiques (GRIL), Université de Montréal, Campus MIL, C.P. 6128, Succ. Centre-ville, Montréal, QC H3C 3J7, Canada
| | - Andrea Bertolo
- Centre de recherche sur les interactions bassins versants-écosystèmes aquatiques (RIVE) et Département des sciences de l'environnement, Université du Québec à Trois-Rivières, 3351 Boul. des Forges, C.P. 500, Trois-Rivières, QC G8Z 4M3, Canada; Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Université de Montréal, Campus MIL, C.P. 6128, Succ. Centre-ville, Montréal, QC H3C 3J7, Canada
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12
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Pinto EP, Paredes E, Bellas J. Influence of microplastics on the toxicity of chlorpyrifos and mercury on the marine microalgae Rhodomonas lens. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 857:159605. [PMID: 36273570 DOI: 10.1016/j.scitotenv.2022.159605] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 10/03/2022] [Accepted: 10/17/2022] [Indexed: 06/16/2023]
Abstract
The growing use of plastics, including microplastics (MPs), has enhanced their potential release into aquatic environments, where microalgae represent the basis of food webs. Due to their physicochemical properties, MPs may act as carriers of organic and inorganic pollutants. The present study aimed to determine the toxicity of polyethylene MPs (plain and oxidized) and the model pollutants chlorpyrifos (CPF) and mercury (Hg) on the red microalgae Rhodomonas lens, to contribute to the understanding of the effects of MPs and associated pollutants on marine ecosystems, including the role of MPs as vectors of potentially harmful pollutants to marine food webs. R. lens cultures were exposed to MPs (1-1000 μg/L; 25-24,750 particles/mL), CPF (1-4900 μg/L), Hg (1-500 μg/L), and to CPF- and Hg-loaded MPs, for 96 h. Average specific growth rate (ASGR, day-1), cellular viability and pigment concentration (chlorophyll a, c2 and carotenoids) were measured at 48 and 96 h. No significant effects were observed on the growth pattern of the microalgae after 96-h exposure to plain and oxidized MPs. However, a significant increase in cell concentration was detected after 48-h exposure to plain MPs. A decrease of the ASGR was noticed after exposure to CPF, Hg and to CPF/Hg-loaded MPs, whereas viability was affected by exposure to MPs, CPF and Hg, alone and in combination. Chlorophyll a and c2 significantly decreased when microalgae were exposed to plain MPs and CPF, while both pigments significantly increased when exposed to CPF-loaded MPs. Similarly, chlorophyll and carotenoids content significantly decreased after exposure to Hg, whereas a significant increase in chlorophyll a was observed after 48-h exposure to Hg-loaded MPs, at the higher tested concentration. Overall, the presence of MPs modulates the toxicity of Hg and CPF to these microalgae, decreasing the toxic effects on R. lens, probably due to a lower bioavailability of the contaminants.
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Affiliation(s)
- Estefanía P Pinto
- Centro de investigación Mariña (CIM), Departamento de Ecoloxía e Bioloxía Animal, Laboratorio de Ecoloxía Costeira (ECOCOST), Universidade de Vigo, Spain.
| | - Estefanía Paredes
- Centro de investigación Mariña (CIM), Departamento de Ecoloxía e Bioloxía Animal, Laboratorio de Ecoloxía Costeira (ECOCOST), Universidade de Vigo, Spain
| | - Juan Bellas
- Centro Oceanográfico de Vigo, Instituto Español de Oceanografía (IEO, CSIC), Subida a Radio Faro 50, 36390 Vigo, Spain
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13
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Yoo JW, Jeon M, Lee KW, Jung JH, Jeong CB, Lee YM. The single and combined effects of mercury and polystyrene plastic beads on antioxidant-related systems in the brackish water flea: toxicological interaction depending on mercury species and plastic bead size. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2022; 252:106325. [PMID: 36242789 DOI: 10.1016/j.aquatox.2022.106325] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 08/29/2022] [Accepted: 10/09/2022] [Indexed: 06/16/2023]
Abstract
Plastics are considered as a major threat to marine environments owing their high usage, persistence, and negative effects on aquatic organisms. Although they often exist as mixtures in combination with other pollutants (e.g., mercury (Hg)) in aquatic ecosystems, the combined effects of plastics and ambient pollutants remain unclear. Therefore, in the present study, we investigated the toxicological interactions between Hg and plastics using two Hg species (HgCl2 and MeHgCl) and different-sized polystyrene (PS) beads (diameter: 0.05, 0.5, and 6-μm) in the brackish water flea Diaphanosoma celebensis. The single and combined effects of Hg and PS beads on mortality were investigated, and changes in the antioxidant system and lipid peroxidation were further analyzed. After 48-h exposure to single Hg, HgCl2 induced a higher mortality rate than MeHgCl. The combined exposure test showed that 0.05-μm PS beads can enhance the toxicity of both the Hg species. The expression of GST-mu, glutathione S-transferease (GST) activity and malondialdehyde (MDA) content increased significantly after exposure to Hg alone (HgCl2 or MeHgCl) exposure. Combined exposure with PS beads modulated the effects of Hg on the antioxidant system depending on bead size and the Hg species. In particular, the 0.05-μm beads significantly increased the expression level of GST-mu, GST activity and MDA content, regardless of Hg species. These findings suggest that toxicological interactions between Hg and PS beads depend on the type of Hg species and the size of PS beads; nano-sized 0.05-μm PS beads can induce synergistic toxicity with Hg.
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Affiliation(s)
- Je-Won Yoo
- Department of Biotechnology, College of Convergence Engineering, Sangmyung University, Seoul, 03016, Republic of Korea
| | - MinJeong Jeon
- Department of Biotechnology, College of Convergence Engineering, Sangmyung University, Seoul, 03016, Republic of Korea
| | - Kyun-Woo Lee
- Korea Institute of Ocean Science and Technology, 385, Haeyang-ro, Youngdo, Busan, 49111, South Korea
| | - Jee-Hyun Jung
- Risk Assessment Research Center, Korea Institute of Ocean Science and Technology, Geoje, 53201, Republic of Korea; Department of Ocean Science, Korea University of Science and Technology, Daejeon, 34113, Republic of Korea
| | - Chang-Bum Jeong
- Department of Marine Science, College of Natural Sciences, Incheon National University, Incheon, 22012, Republic of Korea.
| | - Young-Mi Lee
- Department of Biotechnology, College of Convergence Engineering, Sangmyung University, Seoul, 03016, Republic of Korea.
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14
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Qin F, Amyot M, Bertolo A. Grazer-mediated regeneration of methylmercury, inorganic mercury, and other metals in freshwater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 829:154553. [PMID: 35304153 DOI: 10.1016/j.scitotenv.2022.154553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Revised: 03/08/2022] [Accepted: 03/09/2022] [Indexed: 06/14/2023]
Abstract
Whereas it is well established that zooplankton can transfer various pollutants such as mercury (Hg) from primary producers to higher trophic levels, less is known on the effects of their activities on the recycling of Hg in aquatic ecosystems. Here, the impact of zooplankton grazing efficiency and excretion/egestion processes on metal concentrations in freshwater was investigated. Isotopically labeled algae (200HgCl2, Me198HgCl) was used as a food source and the transfer of the selected isotopes to the culture medium during grazing was measured. In parallel, the potential for the recycling of major ions and metals, including selected essential and non-essential metals, was investigated for this could help to track the effects of sloppy feeding. To highlight the role of feeding behavior, a large filter-feeder (Daphnia magna) was compared to a smaller selective feeder zooplankton taxon (calanoid copepods), with the latter being expected to cause more sloppy feeding than the former. The experiments demonstrated that zooplankton grazing of both taxa significantly influenced the concentrations of the particulate portion of both inorganic Hg (IHg) and monomethylmercury (MeHg) in water. In contrast, only Daphnia significantly increased the concentration of dissolved IHg, whereas the concentration of dissolved MeHg was not affected by either grazer. The results also suggested that both taxa affected the concentrations of dissolved Fe, Zn, SO42- and rare earth elements via sloppy feeding, whereas only Daphnia significantly increased the concentration of dissolved Cu via this mechanism. The effects of excretion/egestion were negligible except for dissolved IHg and Cu in Daphnia treatment. These results highlight a neglected pathway of IHg and MeHg recycling in the water column in freshwater ecosystems with potentially important consequences for trophic transfer.
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Affiliation(s)
- Fan Qin
- Centre de recherche sur les interactions bassins versants - écosystèmes aquatiques (RIVE) and Département des sciences de l'environnement, Université du Québec à Trois-Rivières, 3351 Boul. des Forges, C.P. 500, Trois-Rivières, QC G8Z 4M3, Canada; Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Université de Montréal, Campus MIL, C.P. 6128, Succ. Centre-ville, Montréal, QC H3C 3J7, Canada
| | - Marc Amyot
- Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Université de Montréal, Campus MIL, C.P. 6128, Succ. Centre-ville, Montréal, QC H3C 3J7, Canada; Département de sciences biologiques, Université de Montréal, Campus MIL, C.P. 6128, Succ. Centre-ville, Montréal, QC H3C 3J7, Canada
| | - Andrea Bertolo
- Centre de recherche sur les interactions bassins versants - écosystèmes aquatiques (RIVE) and Département des sciences de l'environnement, Université du Québec à Trois-Rivières, 3351 Boul. des Forges, C.P. 500, Trois-Rivières, QC G8Z 4M3, Canada; Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Université de Montréal, Campus MIL, C.P. 6128, Succ. Centre-ville, Montréal, QC H3C 3J7, Canada.
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15
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Li ML, Kwon SY, Poulin BA, Tsui MTK, Motta LC, Cho M. Internal Dynamics and Metabolism of Mercury in Biota: A Review of Insights from Mercury Stable Isotopes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:9182-9195. [PMID: 35723432 PMCID: PMC9261262 DOI: 10.1021/acs.est.1c08631] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Monitoring mercury (Hg) levels in biota is considered an important objective for the effectiveness evaluation of the Minamata Convention. While many studies have characterized Hg levels in organisms at multiple spatiotemporal scales, concentration analyses alone often cannot provide sufficient information on the Hg exposure sources and internal processes occurring within biota. Here, we review the decadal scientific progress of using Hg isotopes to understand internal processes that modify the speciation, transport, and fate of Hg within biota. Mercury stable isotopes have emerged as a powerful tool for assessing Hg sources and biogeochemical processes in natural environments. A better understanding of the tissue location and internal mechanisms leading to Hg isotope change is key to assessing its use for biomonitoring. We synthesize the current understanding and uncertainties of internal processes leading to Hg isotope fractionation in a variety of biota, in a sequence of better to less studied organisms (i.e., birds, marine mammals, humans, fish, plankton, and invertebrates). This review discusses the opportunities and challenges of using certain forms of biota for Hg source monitoring and the need to further elucidate the physiological mechanisms that control the accumulation, distribution, and toxicity of Hg in biota by coupling new techniques with Hg stable isotopes.
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Affiliation(s)
- Mi-Ling Li
- School
of Marine Science and Policy, University
of Delaware, 201 Robinson Hall, Newark, Delaware 19716, United
States
| | - Sae Yun Kwon
- Division
of Environmental Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro,
Nam-Gu, Pohang 37673, South Korea
- Institute
for Convergence Research and Education in Advanced Technology, Yonsei University, 85 Songdogwahak-Ro, Yeonsu-Gu, Incheon 21983, South Korea
| | - Brett A. Poulin
- Department
of Environmental Toxicology, University
of California Davis, One Shields Avenue, Davis, California 95616, United States
| | - Martin Tsz-Ki Tsui
- School
of Life Sciences, State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong SAR 999077, China
| | - Laura C. Motta
- Department
of Chemistry, University at Buffalo, 359 Natural Sciences Complex, Buffalo, New York 14260-3000, United States
| | - Moonkyoung Cho
- Division
of Environmental Science and Engineering, Pohang University of Science and Technology, 77 Cheongam-Ro,
Nam-Gu, Pohang 37673, South Korea
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16
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Kinetic Aspects of the Interactions between TiO2 Nanoparticles, Mercury and the Green Alga Chlamydomonas reinhardtii. ENVIRONMENTS 2022. [DOI: 10.3390/environments9040044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Aquatic organisms are exposed to mixtures of environmental pollutants, including engineered nanoparticles; however, the interactions underlying cocktails’ effects are poorly understood, in particular, the kinetic aspects. The present study explored the time course of the interactions between nano-sized titanium dioxide (nTiO2) with different primary particle sizes, algae and inorganic mercury (Hg) over 96 h under conditions that were representative of a highly contaminated environment. The results showed that nTiO2 with smaller primary particle size and higher concentrations rapidly reduced the adsorption and internalization of mercury by green alga Chlamydomonas reinhardtii. Such a mitigating effect on mercury bioavailability could be explained by the strong adsorbing capacity of nTiO2 for Hg and the aggregation and sedimentation of nTiO2 and bound Hg. The present study highlighted the key processes determining the bioavailability of mercury to the algae in mixture exposure under conditions representative of a highly contaminated environment, such as industrial wastewater effluents.
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17
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Cossart T, Garcia-Calleja J, Worms IAM, Tessier E, Kavanagh K, Pedrero Z, Amouroux D, Slaveykova VI. Species-specific isotope tracking of mercury uptake and transformations by pico-nanoplankton in an eutrophic lake. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 288:117771. [PMID: 34271517 DOI: 10.1016/j.envpol.2021.117771] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 07/06/2021] [Accepted: 07/08/2021] [Indexed: 06/13/2023]
Abstract
The present study aims to explore the bioaccumulation and biotic transformations of inorganic (iHg) and monomethyl mercury (MMHg) by natural pico-nanoplankton community from eutrophic lake Soppen, Switzerland. Pico-nanoplankton encompass mainly bacterioplankton, mycoplankton and phytoplankton groups with size between 0.2 and 20 μm. Species-specific enriched isotope mixture of 199iHg and 201MMHg was used to explore the accumulation, the subcellular distribution and transformations occurring in natural pico-nanoplankton sampled at 2 different depths (6.6 m and 8.3 m). Cyanobacteria, diatoms, cryptophyta, green algae and heterotrophic microorganisms were identified as the major groups of pico-nanoplankton with diatoms prevailing at deeper samples. Results showed that pico-nanoplankton accumulated both iHg and MMHg preferentially in the cell membrane/organelles, despite observed losses. The ratios between the iHg and MMHg concentrations measured in the membrane/organelles and cytosol were comparable for iHg and MMHg. Pico-nanoplankton demethylate added 201MMHg (~4 and 12% per day depending on cellular compartment), although the involved pathways are to further explore. Comparison of the concentrations of 201iHg formed from 201MMHg demethylation in whole system, medium and whole cells showed that 82% of the demethylation was biologically mediated by pico-nanoplankton. No significant methylation of iHg by pico-nanoplankton was observed. The accumulation of iHg and MMHg and the percentage of demethylated MMHg correlated positively with the relative abundance of diatoms and heterotrophic microorganisms in the pico-nanoplankton, the concentrations of TN, Mg2+, NO3-, NO2-, NH4+ and negatively with the concentrations of DOC, K+, Na+, Ca2+, SO42-. Taken together the results of the present field study confirm the role of pico-nanoplankton in Hg bioaccumulation and demethylation, however further research is needed to better understand the underlying mechanisms and interconnection between heterotrophic and autotrophic microorganisms.
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Affiliation(s)
- Thibaut Cossart
- Environmental Biogeochemistry and Ecotoxicology, Department F.-A. Forel for Environmental and Aquatic Sciences, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, Uni Carl Vogt, Bvd Carl-Vogt 66, CH-1211, Geneva 4, Switzerland
| | - Javier Garcia-Calleja
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les matériaux, Pau, France
| | - Isabelle A M Worms
- Environmental Biogeochemistry and Ecotoxicology, Department F.-A. Forel for Environmental and Aquatic Sciences, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, Uni Carl Vogt, Bvd Carl-Vogt 66, CH-1211, Geneva 4, Switzerland
| | - Emmanuel Tessier
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les matériaux, Pau, France
| | - Killian Kavanagh
- Environmental Biogeochemistry and Ecotoxicology, Department F.-A. Forel for Environmental and Aquatic Sciences, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, Uni Carl Vogt, Bvd Carl-Vogt 66, CH-1211, Geneva 4, Switzerland
| | - Zoyne Pedrero
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les matériaux, Pau, France
| | - David Amouroux
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les matériaux, Pau, France
| | - Vera I Slaveykova
- Environmental Biogeochemistry and Ecotoxicology, Department F.-A. Forel for Environmental and Aquatic Sciences, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, Uni Carl Vogt, Bvd Carl-Vogt 66, CH-1211, Geneva 4, Switzerland.
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18
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Garcia-Calleja J, Cossart T, Pedrero Z, Santos JP, Ouerdane L, Tessier E, Slaveykova VI, Amouroux D. Determination of the Intracellular Complexation of Inorganic and Methylmercury in Cyanobacterium Synechocystis sp. PCC 6803. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:13971-13979. [PMID: 34591446 DOI: 10.1021/acs.est.1c01732] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Understanding of mercury (Hg) complexation with low molecular weight (LMW) bioligands will help elucidate its speciation. In natural waters, the rate of this complexation is governed by physicochemical, geochemical, and biochemical parameters. However, the role of bioligands involved in Hg intracellular handling by aquatic microorganisms is not well documented. Here, we combine the use of isotopically labeled Hg species (inorganic and monomethylmercury, iHg and MeHg) with gas or liquid chromatography coupling to elemental and molecular mass spectrometry to explore the role of intracellular biogenic ligands involved in iHg and MeHg speciation in cyanobacterium Synechocystis sp. PCC 6803, a representative phytoplankton species. This approach allowed to track resulting metabolic and newly found intracellular Hg biocomplexes (e.g., organic thiols) in Synechocystis sp. PCC 6803 finding different intracellular Hg species binding affinities with both high and low molecular weight (HMW and LMW) bioligands in the exponential and stationary phase. Furthermore, the parallel detection with both elemental and molecular ionization sources allowed the sensitive detection and molecular identification of glutathione (GSH) as the main low molecular weight binding ligand to iHg ((GS)2-Hg) and MeHg (GS-MeHg) in the cytosolic fraction. Such a novel experimental approach expands our knowledge on the role of biogenic ligands involved in iHg and MeHg intracellular handling in cyanobacteria.
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Affiliation(s)
- Javier Garcia-Calleja
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les matériaux, Pau 64000, France
| | - Thibaut Cossart
- Faculty of Sciences, Earth and Environment Sciences, Department F.-A. Forel for Environmental and Aquatic Sciences, University of Geneva, Uni Carl Vogt, 66 Bvd. Carl Vogt, 1205 Geneva, Switzerland
| | - Zoyne Pedrero
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les matériaux, Pau 64000, France
| | - João P Santos
- Faculty of Sciences, Earth and Environment Sciences, Department F.-A. Forel for Environmental and Aquatic Sciences, University of Geneva, Uni Carl Vogt, 66 Bvd. Carl Vogt, 1205 Geneva, Switzerland
| | - Laurent Ouerdane
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les matériaux, Pau 64000, France
| | - Emmanuel Tessier
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les matériaux, Pau 64000, France
| | - Vera I Slaveykova
- Faculty of Sciences, Earth and Environment Sciences, Department F.-A. Forel for Environmental and Aquatic Sciences, University of Geneva, Uni Carl Vogt, 66 Bvd. Carl Vogt, 1205 Geneva, Switzerland
| | - David Amouroux
- Universite de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les matériaux, Pau 64000, France
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19
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Yu H, Wang K, Huang H, Zhang X, Li T. The regulatory role of root in cadmium accumulation in a high cadmium-accumulating rice line (Oryza sativa L.). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:25432-25441. [PMID: 33462687 DOI: 10.1007/s11356-021-12373-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Accepted: 01/04/2021] [Indexed: 06/12/2023]
Abstract
There are some key processes that regulate cadmium (Cd) accumulation in rice. Understanding the characteristics and mechanisms of Cd accumulation in high Cd-accumulating rice lines benefits for excavating relevant genes. Cd accumulation and distribution in roots of Lu527-8, a high Cd-accumulating rice line, were investigated by a hydroponic experiment, with a control of a normal rice line (Lu527-4). Lu527-8 showed significantly higher Cd concentrations in roots than Lu527-4. More than 81% of Cd in roots of two rice lines is distributed in soluble fraction and cell wall. In soluble fraction, there were more organic acids, amino acids, and phytochelatins in Lu527-8, benefiting Cd accumulation. Pectin and hemicellulose 1 (HC1), especially pectin, were main polysaccharides in cell wall. Lu527-8 showed more pectin and HC1 along with higher pectin methylesterase (PME) activity compared with Lu527-4, promoting Cd accumulation. Besides, Lu527-8 showed higher Cd translocation from root to shoot due to more amounts of ethanol-extractable Cd in roots than Lu527-4. In conclusion, specific characteristics of Cd chemical forms and subcellular distribution in roots of high Cd-accumulating rice line are important for Cd accumulation and translocation.
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Affiliation(s)
- Haiying Yu
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
| | - Keji Wang
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
| | - Huagang Huang
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
| | - Xizhou Zhang
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China
| | - Tingxuan Li
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, Sichuan, China.
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Rutkowska M, Namieśnik J, Konieczka P. Production of certified reference materials - homogeneity and stability study based on the determination of total mercury and methylmercury. Microchem J 2020. [DOI: 10.1016/j.microc.2019.104338] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Yu ZG, Zhang L, Wu Y, Jin B. Efflux behavior of inorganic mercury and methylmercury in the marine copepod Tigriopus japonicus. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 703:135655. [PMID: 31767324 DOI: 10.1016/j.scitotenv.2019.135655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 11/17/2019] [Accepted: 11/18/2019] [Indexed: 06/10/2023]
Abstract
Marine copepods play an important role in transferring mercury to higher trophic levels in aquatic ecosystems. Exposure time is an important environmental parameter that potentially influences the bioaccumulation and biomagnification of Hg in copepods, which increases the uncertainty in risk assessments of Hg in food chains. In the present study, we employed the radiotracer technique to evaluate the efflux behavior of inorganic mercury [Hg(II)] and methylmercury (MeHg), and the effects of exposure time in a population of Tigriopus japonicus copepods. Exposure treatments were compared to understand the effects of exposure time (1 d, 3 d, and 7 d) on the release routes and efflux rate constants (ke) of Hg in copepods. During a depuration period of 5 d, the ke value of Hg(II) in the three exposure treatments ranged from 0.190-0.330 d-1, while the ke of MeHg was generally slower and ranged from 0.031-0.051 d-1. The exposure time significantly affected the efflux rates of Hg(II), i.e., a longer exposure time caused a higher retained Hg(II) burden in copepods, while no significant changes were observed in the MeHg treatments. The release routes of Hg in T. japonicus included excretion, feces production, and reproduction. In all the treatments, the excretion of Hg was the most important release route. The relative contribution of reproduction significantly increased in the MeHg exposure treatments, while the contribution of water excretion decreased with exposure time. Our study demonstrated that the retention of Hg(II) and the maternal transfer of MeHg were time-dependent and significantly affected by exposure time. Long-term exposure caused a decrease in the ke of Hg(II) and increase in the contribution of MeHg transfer to nauplii, thereby indicating an increasing risk of biological transmission of Hg under long-term exposure.
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Affiliation(s)
- Zhi-Guo Yu
- School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, 210044 Nanjing, China; State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
| | - Le Zhang
- School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, 210044 Nanjing, China
| | - Yun Wu
- Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC), Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CIC-AEET), School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China.
| | - Biao Jin
- State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
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Metian M, Pouil S, Dupuy C, Teyssié JL, Warnau M, Bustamante P. Influence of food (ciliate and phytoplankton) on the trophic transfer of inorganic and methyl-mercury in the Pacific cupped oyster Crassostrea gigas. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 257:113503. [PMID: 31761584 DOI: 10.1016/j.envpol.2019.113503] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 10/07/2019] [Accepted: 10/27/2019] [Indexed: 06/10/2023]
Abstract
Diet is an important route of mercury (Hg) uptake in marine organisms. Trophic transfer of Hg throughout the food webs may be influenced by various factors, including diet and Hg speciation. Bivalves such as oysters are widely used as bioindicators of trace element pollution such as Hg. Nevertheless, our current knowledge regarding their ability to accumulate Hg from their diet is mainly based on experiments performed using phytoplankton. In their natural environment, oysters feed on a variety of food items including ciliates, detritus, in addition to phytoplankton. The present study aimed at examining the influence of diet composition on the trophic transfer of inorganic Hg (iHg) and methylmercury (MeHg) in the Pacific cupped oyster Crassostrea gigas. The pulse-chase feeding method was used with two radiolabeled food items: a heterotrophic protist (Uronema marinum) and a phytoplanktonic diatom (Thalassiosira pseudonana). Depuration of dietary Hg in the oysters was followed for 50 d. Kinetic parameters including assimilation efficiency (AE) and efflux rate constant (ke) were calculated. Our results showed that oysters fed on ciliates assimilated 96 ± 1% and 31 ± 2% of the ingested MeHg and iHg, respectively whereas these elements were similarly assimilated in the oysters fed on phytoplankton (78 ± 3% and 86 ± 4% for MeHg and iHg, respectively). Mercury assimilation in oyster is thus diet dependent (significant differences in AE, p < 0.05), metal species-dependent and likely resulting from variations in Hg bioavailability in the two food items tested and a gut passage time-dependent of the ingested matrix.
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Affiliation(s)
- Marc Metian
- International Atomic Energy Agency, Environment Laboratories, 4a, Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco.
| | - Simon Pouil
- International Atomic Energy Agency, Environment Laboratories, 4a, Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco
| | - Christine Dupuy
- Littoral Environnement et Sociétés (LIENSs), UMR 7266, CNRS-La Rochelle Université, 2 rue Olympe de Gouges, F-17000, La Rochelle, France
| | - Jean-Louis Teyssié
- International Atomic Energy Agency, Environment Laboratories, 4a, Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco
| | - Michel Warnau
- International Atomic Energy Agency, Environment Laboratories, 4a, Quai Antoine Ier, MC-98000, Principality of Monaco, Monaco
| | - Paco Bustamante
- Littoral Environnement et Sociétés (LIENSs), UMR 7266, CNRS-La Rochelle Université, 2 rue Olympe de Gouges, F-17000, La Rochelle, France
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Chen ZE, Zhang H, Iqbal Z. A new thiosemicarbazone fluorescent probe based on 9,9'-bianthracene for Hg 2+ and Ag . SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 215:34-40. [PMID: 30825868 DOI: 10.1016/j.saa.2019.02.036] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Revised: 01/21/2019] [Accepted: 02/16/2019] [Indexed: 06/09/2023]
Abstract
A new 9,9'-bianthracene-based thiosemicarbazone (D1) has been successfully synthesized and utilized for chemosensors. The properties of D1 were systematically investigated by UV-Vis, fluorescence titration and theoretical calculations. As a result, D1 exhibits a characteristic fluorescence quenching phenomenon in the presence of Hg2+ or Ag+ compared to other metal cations (Na+, K+, Mg2+, Ba2+, Al3+, Zn2+, Fe2+, Pb2+, Cu2+, Co2+, Cd2+, Ni2+ and Mn2+). The detection limits of Hg2+ and Ag+ reach 6.62×10-7M and 1.99×10-5M, respectively. This is mainly attributed to the Hg2+ (or Ag+) forms a stable five-membered ring with the N atom in Schiff base CN and the S atom in thiourea. The results suggest that the probe D1 is a promising candidate for chemosensors in aqueous media due to its highly selectivity for Hg2+ and Ag+.
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Affiliation(s)
- Zhen-E Chen
- School of Chemistry and Chemical Engineering, Qianbei Featured Resources Applied Research Key Laboratory, Zunyi Normal College, Zunyi 563006, China.
| | - Hai Zhang
- School of Chemistry and Chemical Engineering, Qianbei Featured Resources Applied Research Key Laboratory, Zunyi Normal College, Zunyi 563006, China
| | - Zafar Iqbal
- Applied Chemistry Research Centre, PCSIR Laboratories Complex, Feroze pur Road Lahore 54000, Pakistan
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Yuan H, Ji W, Chu S, Liu Q, Qian S, Guang J, Wang J, Han X, Masson JF, Peng W. Mercaptopyridine-Functionalized Gold Nanoparticles for Fiber-Optic Surface Plasmon Resonance Hg 2+ Sensing. ACS Sens 2019; 4:704-710. [PMID: 30785267 DOI: 10.1021/acssensors.8b01558] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
As a highly toxic heavy metal ion, divalent mercuric ion (Hg2+) is one of the most widely diffused and hazardous environmental pollutants. In this work, a simple, portable, and inexpensive fiber-optic sensor based on surface plasmon resonance (SPR) effect was developed for Hg2+ detection, which takes advantage of 4-mercaptopyridine (4-MPY)-functionalized Au nanoparticles (Au NPs/4-MPY) as a signal amplification tag. Based on the coordination between Hg2+ and nitrogen in the pyridine moiety, we developed the sensor by self-assembling 4-MPY on Au film surfaces to capture Hg2+ and then introducing Au NPs/4-MPY to generate a plasmonic coupling structure with the configuration of nanoparticle-on-mirror. The coupling between localized SPR increased changes in SPR wavelength, which allowed highly sensitive Hg2+ sensing in aqueous solution. The sensor exhibited superior selectivity for Hg2+ detection compared with other common metal ions in water. The sensor's Hg2+ detection limit is 8 nM under optimal conditions. Furthermore, we validated the sensor's practicality for Hg2+ detection in tap water samples and demonstrated its potential application for environmental water on-site monitoring.
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25
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Zhang L, Wang WX. Dominant Role of Silver Ions in Silver Nanoparticle Toxicity to a Unicellular Alga: Evidence from Luminogen Imaging. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:494-502. [PMID: 30525502 DOI: 10.1021/acs.est.8b04918] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Despite the extensive studies on silver nanoparticle (AgNP) toxicity, the contribution of released silver ions to the toxicity still remains debatable. This study investigated the toxicity of AgNPs with different sizes (20 and 60 nm) toward a phytoplankton Euglena gracilis, with a focus on evaluating the contributions of dissolved Ag to the toxicity by combining a newly developed aggregation-induced emission luminogen (AIEgen)-based imaging technique and a traditional inductively coupled plasma mass spectrometry (ICP-MS) method. Smaller AgNPs, which dissolved much faster, exhibited greater toxicity, as evidenced by lower 50% growth inhibition concentration (EC50). However, the average Ag+ concentration at each EC50 was comparable to the EC50 of AgNO3, and similar subcellular Ag distribution patterns were observed in both AgNPs and AgNO3 exposed algae. More silver ions were internalized in algae treated with smaller AgNPs. With the application of luminogen imaging technology, we for the first time demonstrated that few Ag(I) were presented intracellularly in algae exposed to AgNPs when any released Ag in the medium was complexed by cysteine. Ag(I) was mainly distributed in cellular debris, organelles, and metal-rich granules fractions. No conclusive evidence for AgNP internalization was documented. Our results strongly suggested that Ag+ released from AgNPs extracellularly dominated the AgNP toxicity. The findings of this work provide new and useful insight into the toxicity of AgNPs in aquatic environments.
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Affiliation(s)
- Luqing Zhang
- Marine Environmental Laboratory , HKUST Shenzhen Research Institute , Shenzhen 518057 , China
- Department of Ocean Science , The Hong Kong University of Science and Technology (HKUST) , Clear Water Bay , Kowloon , Hong Kong , China
| | - Wen-Xiong Wang
- Marine Environmental Laboratory , HKUST Shenzhen Research Institute , Shenzhen 518057 , China
- Department of Ocean Science , The Hong Kong University of Science and Technology (HKUST) , Clear Water Bay , Kowloon , Hong Kong , China
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26
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27
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Ahmad P, Ahanger MA, Alyemeni MN, Wijaya L, Alam P. Exogenous application of nitric oxide modulates osmolyte metabolism, antioxidants, enzymes of ascorbate-glutathione cycle and promotes growth under cadmium stress in tomato. PROTOPLASMA 2018; 255:79-93. [PMID: 28643085 DOI: 10.1007/s00709-017-1132-x] [Citation(s) in RCA: 104] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Accepted: 05/31/2017] [Indexed: 05/21/2023]
Abstract
Experiments were carried out to investigate the role of nitric oxide (NO) in ameliorating the negative effects of cadmium stress in tomato seedlings. Plants treated with cadmium (CdCl2, 150 μM) showed reduced growth, biomass yield, pigment content, chlorophyll fluorescence, and gas exchange parameters. Exogenous application of NO donor (sodium nitroprusside) with nutrient solution protected chlorophyll pigments, restored chlorophyll fluorescence and gas exchange parameters, and caused significant enhancements in growth and biomass yield. Cadmium triggered the synthesis of proline and glycine betaine; however, application of NO caused further enhancement of their accumulation, reflecting an obvious amelioration of the cadmium-induced decline in relative water content. Activities of the antioxidant enzymes superoxide dismutase, catalase, ascorbate peroxidase, and glutathione reductase, monodehydroascorbate reductase, dehydroascorbate reductase, and other enzymatic activities of ascorbate-glutathione cycle were enhanced following the application of NO, as compared with those in untreated seedlings under control and cadmium stress conditions. NO increased the flavonoid and total phenol content in Cd-stressed tomato plants. Moreover, NO application restricted the uptake of cadmium and enhanced the accumulation of nutrients in different parts of tomato plants. On the basis of the findings of the present study, we propose that NO has a potential role as a growth promoter for tomato under cadmium stress.
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Affiliation(s)
- Parvaiz Ahmad
- Department of Botany and Microbiology, Faculty of Science, King Saud University, Riyadh, 11451, Saudi Arabia.
- Department of Botany, S.P. College, Srinagar, Jammu and Kashmir, 190001, India.
| | - Mohammed Abass Ahanger
- Stress Physiology Laboratory, Department of Botany, Jiwaji University Gwalior, Gwalior, MP, 474011, India
| | - Mohammed Nasser Alyemeni
- Department of Botany and Microbiology, Faculty of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Leonard Wijaya
- Department of Botany and Microbiology, Faculty of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Pravej Alam
- Biology Department, College of Science and Humanities, Prince Sattam bin Abdulaziz University (PSAU), 11942, Alkharj, Kingdom of Saudi Arabia
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28
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Ni FJ, Kelly NE, Arhonditsis GB. Towards the development of an ecophysiological Daphnia model to examine effects of toxicity and nutrition. ECOL INFORM 2017. [DOI: 10.1016/j.ecoinf.2017.04.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Mi H, Guan M, Shan H, Fei Q, Huan Y, Zhang Z, Feng G. Highly Sensitive Fluorescence Detection of Hg 2+ Based on a Water-soluble Conjugated Polymer with Carboxylate Groups. ANAL SCI 2016; 32:1039-1045. [PMID: 27725601 DOI: 10.2116/analsci.32.1039] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A label-free, highly selective, and highly sensitive fluorescent sensor to detect Hg2+ was developed using a water-soluble conjugated polymer with carboxylate groups (poly(2,5-bis(sodium 4-oxybutyrate)-1,4-phenylethynylene-alt-1,4-phenyleneethynylene, PPE-OBS) in this work. The fluorescence of PPE-OBS would be quenched because of the effect among the unique coordination-induced aggregation and electron transfers of PPE-OBS toward Hg2+. The linear relationship between the fluorescence intensity and concentration of Hg2+ was observed within the range from 6 × 10-8 to 8 × 10-5 mol L-1 (R2 = 0.9985), and the limit of detection was 2.10 × 10-9 mol L-1. The proposed method was applied to detect Hg2+ in environmental water samples, and satisfactory results were obtained.
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Affiliation(s)
- Hongyu Mi
- Department of Analytical Chemistry, College of Chemistry, Jilin University
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30
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Lavoie M, Raven JA, Jones OAH, Qian H. Energy cost of intracellular metal and metalloid detoxification in wild-type eukaryotic phytoplankton. Metallomics 2016; 8:1097-1109. [DOI: 10.1039/c6mt00049e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Hao X, Li T, Yu H, Zhang X, Zheng Z, Chen G, Zhang S, Zhao L, Pu Y. Cd accumulation and subcellular distribution in two ecotypes of Kyllinga brevifolia Rottb as affected by Cd treatments. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:7461-7469. [PMID: 25874426 DOI: 10.1007/s11356-015-4379-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Accepted: 03/16/2015] [Indexed: 06/04/2023]
Abstract
The Cadmium (Cd) accumulation capacity and subcellular distribution in the mining ecotype (ME) and non-mining ecotype (NME) of Kyllinga brevifolia Rottb were investigated in pot experiments. The results showed that average Cd contents in shoots of the two ecotypes of K. brevifolia were higher than those in roots, whereas Cd concentrations in roots were greater than those in shoots. Also, shoot Cd contents in NME of K. brevifolia were 1.65-45.45 times greater than those in ME when the plants were grown at 5, 25, 50, and 100 mg Cd kg(-1) soil. Moreover, Cd contents in the roots in NME were 1.75-45.45 times higher than those in ME. Subcellular distribution of Cd demonstrated that the majority of Cd in the two ecotypes of K. brevifolia was distributed in the cell walls and soluble fraction, and a small percentage of Cd existed in organelle fraction. In addition, proportions of Cd distributed in shoots and roots cell walls of NME were greater than those in ME. It could be assumed that compared with ME, NME of K. brevifolia has better Cd accumulation capacity, and the subcellular distribution of Cd might be one of the mechanisms to explain such phenomena.
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Affiliation(s)
- Xiaoqing Hao
- College of Resources and Environmental Science, Sichuan Agricultural University, Huimin Road 211#, Chengdu, 611130, Sichuan, People's Republic of China
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Zeng X, Chen X, Zhuang J. The positive relationship between ocean acidification and pollution. MARINE POLLUTION BULLETIN 2015; 91:14-21. [PMID: 25534629 DOI: 10.1016/j.marpolbul.2014.12.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Revised: 11/24/2014] [Accepted: 12/03/2014] [Indexed: 06/04/2023]
Abstract
Ocean acidification and pollution coexist to exert combined effects on the functions and services of marine ecosystems. Ocean acidification can increase the biotoxicity of heavy metals by altering their speciation and bioavailability. Marine pollutants, such as heavy metals and oils, could decrease the photosynthesis rate and increase the respiration rate of marine organisms as a result of biotoxicity and eutrophication, facilitating ocean acidification to varying degrees. Here we review the complex interactions between ocean acidification and pollution in the context of linkage of multiple stressors to marine ecosystems. The synthesized information shows that pollution-affected respiration acidifies coastal oceans more than the uptake of anthropogenic carbon dioxide. Coastal regions are more vulnerable to the negative impact of ocean acidification due to large influxes of pollutants from terrestrial ecosystems. Ocean acidification and pollution facilitate each other, and thus coastal environmental protection from pollution has a large potential for mitigating acidification risk.
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Affiliation(s)
- Xiangfeng Zeng
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; University of Chinese Academy of Sciences, Beijing 100039, China
| | - Xijuan Chen
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
| | - Jie Zhuang
- Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; Department of Biosystems Engineering and Soil Science, The University of Tennessee, Knoxville, TN 37996, USA.
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Cheng J, Xu J, Huang Y, Li Y, Zhou J, Cen K. Growth optimisation of microalga mutant at high CO₂ concentration to purify undiluted anaerobic digestion effluent of swine manure. BIORESOURCE TECHNOLOGY 2015; 177:240-246. [PMID: 25496944 DOI: 10.1016/j.biortech.2014.11.099] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Revised: 11/24/2014] [Accepted: 11/25/2014] [Indexed: 06/04/2023]
Abstract
Growth rate of the microalga Chlorella PY-ZU1 mutated by nuclear irradiation was optimised for use in the purification of undiluted anaerobic digestion effluent of swine manure (UADESM) with 3745 mg L(-1) chemical oxygen demand (COD) and 1135 mg L(-1) total nitrogen content. The problem of accessible carbon in UADESM was solved by continuous introduction of 15% (v/v) CO2. Adding phosphorus to UADESM and aeration of UADESM before inoculation both markedly reduced the lag phase of microalgal growth. In addition, the biomass yield and average growth rate of Chlorella PY-ZU1 increased significantly to 4.81 g L(-1) and 601.2 mg L(-1) d(-1), respectively, while the removal efficiencies of total phosphorus, COD and ammonia nitrogen increased to 95%, 79% and 73%, respectively. Thus, the findings indicate that Chlorella PY-ZU1 can be used for effective purification of UADESM, while the biomass can be safely used as animal feed supplement.
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Affiliation(s)
- Jun Cheng
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
| | - Jiao Xu
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Yun Huang
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Yuyou Li
- Department of Civil and Environmental Engineering, Tohoku University, Sendai 9808579, Japan
| | - Junhu Zhou
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Kefa Cen
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Zhou Y, Xu YB, Xu JX, Zhang XH, Xu SH, Du QP. Combined toxic effects of heavy metals and antibiotics on a Pseudomonas fluorescens strain ZY2 isolated from swine wastewater. Int J Mol Sci 2015; 16:2839-50. [PMID: 25633105 PMCID: PMC4346868 DOI: 10.3390/ijms16022839] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 01/07/2015] [Accepted: 01/14/2015] [Indexed: 11/20/2022] Open
Abstract
A Pseudomonas fluorescens strain ZY2, isolated from swine wastewater, was used to investigate the synergistic effects of five heavy metals (Pb, Cu, Zn, Cr(VI) and Hg) on bacterial resistance to antibiotics. Results indicate that the combined effects of antibiotic type, heavy metal type and concentration were significant (p < 0.01). Cross-resistance to Hg and antibiotics was the most noticeable. Moreover, the resistance to Hg and cefradine or amoxicillin, and Cr and amoxicillin were synergistic for low heavy metal concentrations, and turned antagonistic with increasing concentrations, while the resistances to Cr or Cu and cefradine, Pb or Cu and amoxicillin, Cu and norfloxacin showed reverse effects. In addition, resistance to Zn and amoxicillin were always synergetic, while resistance to Pb and cefradine or norfloxacin, Cr or Hg and norfloxacin as well as all the heavy metals and tetracycline were antagonistic. These results indicate that bacterial resistance to antibiotics can be affected by the type and concentration of co-exposed heavy metals and may further threaten people’s health and ecological security severely via horizontal gene transfer.
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Affiliation(s)
- Yan Zhou
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Yan-Bin Xu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Jia-Xin Xu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Xiao-Hua Zhang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Shi-Hui Xu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
| | - Qing-Ping Du
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
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Silva-Filho EV, Kütter VT, Figueiredo TS, Tessier E, Rezende CE, Teixeira DC, Silva CA, Donard OFX. Mercury speciation in plankton from the Cabo Frio Bay, SE--Brazil. ENVIRONMENTAL MONITORING AND ASSESSMENT 2014; 186:8141-8150. [PMID: 25117495 DOI: 10.1007/s10661-014-3992-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Accepted: 07/31/2014] [Indexed: 06/03/2023]
Abstract
Mercury (Hg) is considered a global pollutant, and the scientific community has shown great concern about its toxicity as it may affect the biota of entire systems, through bioaccumulation and bioamplification processes of its organic form, methylmercury (MeHg), along food web. However, few research studies deal with bioaccumulation of Hg from marine primary producers and the first-order consumers. So, this study aims to determine Hg distribution and concentration levels in phytoplankton and zooplankton in the Cabo Frio Bay, Brazil, a site influenced by coastal upwelling. The results from Hg speciation analyses show that inorganic mercury Hg(II) was the predominant specie in plankton from this bay. The annual Hg species distribution in plankton shown mean concentration of 2.00 ± 1.28 ng Hg(II) g(-1) and 0.15 ± 0.08 ng MeHg g(-1) wet weight (phytoplankton) and 2.5 ± 2.03 ng Hg(II) g(-1) and 0.25 ± 0.09 ng MeHg g(-1) wet weight (zooplankton). Therefore, upwelling zones should be considered in the Hg biogeochemical cycle models as a process that enhances Hg(II) bioaccumulation in plankton, raising its bioavailability and shelf deposition.
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Affiliation(s)
- Emmanoel V Silva-Filho
- Departamento de Geoquímica, Instituto de Química, Universidade Federal Fluminense, Outeiro São João Batista s/n, 24020-141, Niterói, RJ, Brazil,
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Bravo AG, Le Faucheur S, Monperrus M, Amouroux D, Slaveykova VI. Species-specific isotope tracers to study the accumulation and biotransformation of mixtures of inorganic and methyl mercury by the microalga Chlamydomonas reinhardtii. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2014; 192:212-215. [PMID: 24932531 DOI: 10.1016/j.envpol.2014.05.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 04/30/2014] [Accepted: 05/09/2014] [Indexed: 06/03/2023]
Abstract
The present study demonstrates that species-specific isotope tracing is an useful tool to precisely measure Hg accumulation and transformations capabilities of living organisms at concentrations naturally encountered in the environment. To that end, a phytoplanktonic green alga Chlamydomonas reinhardtii Dangeard (Chlamydomonadales, Chlorophyceae) was exposed to mixtures of (199)-isotopically enriched inorganic mercury ((199)IHg) and of (201)-isotopically enriched monomethylmercury ((201)CH3Hg) at a concentration range between less than 1 pM to 4 nM. Additionally, one exposure concentration of both mercury species was also studied separately to evaluate possible interactive effects. No difference in the intracellular contents was observed for algae exposed to (199)IHg and (201)CH3Hg alone or in their mixture, suggesting similar accumulation capacity for both species at the studied concentrations. Demethylation of (201)CH3Hg was observed at the highest exposure concentrations, whereas no methylation was detected.
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Affiliation(s)
- Andrea Garcia Bravo
- University of Geneva, Earth and Environment Sciences, Institute F.-A. Forel, 10 route de Suisse, CP 416, CH-1290 Versoix, Switzerland.
| | - Séverine Le Faucheur
- University of Geneva, Earth and Environment Sciences, Institute F.-A. Forel, 10 route de Suisse, CP 416, CH-1290 Versoix, Switzerland
| | - Mathilde Monperrus
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les Matériaux, IPREM UMR 5254 CNRS - Université de Pau et des Pays de l'Adour, Hélioparc, 2, Avenue Pierre Angot, 64053 Pau Cedex, France
| | - David Amouroux
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, Institut des Sciences Analytiques et de Physico-chimie pour l'Environnement et les Matériaux, IPREM UMR 5254 CNRS - Université de Pau et des Pays de l'Adour, Hélioparc, 2, Avenue Pierre Angot, 64053 Pau Cedex, France
| | - Vera I Slaveykova
- University of Geneva, Earth and Environment Sciences, Institute F.-A. Forel, 10 route de Suisse, CP 416, CH-1290 Versoix, Switzerland.
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Le Faucheur S, Campbell PGC, Fortin C, Slaveykova VI. Interactions between mercury and phytoplankton: speciation, bioavailability, and internal handling. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2014; 33:1211-1224. [PMID: 24127330 DOI: 10.1002/etc.2424] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 06/11/2013] [Accepted: 10/03/2013] [Indexed: 06/02/2023]
Abstract
The present review describes and discusses key interactions between mercury (Hg) and phytoplankton to highlight the role of phytoplankton in the biogeochemical cycle of Hg and to understand direct or indirect Hg effects on phytoplankton. Phytoplankton are exposed to various Hg species in surface waters. Through Hg uptake, phytoplankton affect the concentration, speciation, and fate of Hg in aquatic systems. The mechanisms by which phytoplankton take up Hg are still not well known, but several studies have suggested that both facilitated transport and passive diffusion could be involved. Once internalized, Hg will impact several physiological processes, including photosynthesis. To counteract these negative effects, phytoplankton have developed several detoxification strategies, such as the reduction of Hg to elemental Hg or its sequestration by intracellular ligands. Based on the toxicological studies performed so far in the laboratory, Hg is unlikely to be toxic to phytoplankton when they are exposed to environmentally relevant Hg concentrations. However, this statement should be taken with caution because questions remain as to which Hg species control Hg bioavailability and about Hg uptake mechanisms. Finally, phytoplankton are primary producers, and accumulated Hg will be transferred to higher consumers. Phytoplankton are a key component in aquatic systems, and their interactions with Hg need to be further studied to fully comprehend the biogeochemical cycle of Hg and the impact of this ubiquitous metal on ecosystems.
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Affiliation(s)
- Séverine Le Faucheur
- Institute F.-A. Forel, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, Versoix, Switzerland
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Cosio C, Flück R, Regier N, Slaveykova VI. Effects of macrophytes on the fate of mercury in aquatic systems. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2014; 33:1225-1237. [PMID: 24375961 DOI: 10.1002/etc.2499] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 10/16/2013] [Accepted: 11/27/2013] [Indexed: 06/03/2023]
Abstract
Vegetated and shallow areas such as wetlands and salt marshes, as well as freshwater lakes and rivers, have been identified as hotspots for Hg methylation. The presence of aquatic macrophytes, the predominant primary producers in shallow waters, plays an important but still poorly understood role in the fate of Hg in these environments. The present review focuses on the influences of macrophytes on Hg speciation and distribution in sediments, the rhizosphere, and the water column; on Hg transformation; and on Hg release to the environment, including transfer to the trophic web. Future research will require an improved understanding of the mechanisms and the factors controlling these aspects as well as a broader general view. Thus, the main gaps in knowledge are also discussed.
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Affiliation(s)
- Claudia Cosio
- Institute F.-A. Forel, Earth and Environmental Sciences, Faculty of Sciences, University of Geneva, Versoix, Switzerland
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Wu Y, Wang WX. Intracellular speciation and transformation of inorganic mercury in marine phytoplankton. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2014; 148:122-129. [PMID: 24473163 DOI: 10.1016/j.aquatox.2014.01.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2013] [Revised: 01/02/2014] [Accepted: 01/06/2014] [Indexed: 06/03/2023]
Abstract
Metal speciation is closely related to toxicity in aquatic organisms, but quantitative study of mercury transformation has rarely been reported. In this study, the ability of three marine phytoplankton species, including a green alga Chlorella autotrophica, a flagellate Isochrysis galbana and a diatom Thalassiosira weissflogii, to convert inorganic mercury were examined. We found that all algae tested were able to transform Hg(II) into dissolved gaseous mercury (DGM), phytochelatin (PC) complexes and metacinnabar (β-HgS). The most tolerant species, T. weissflogii, generally produced the highest level of PCs and β-HgS. Attributed to the highest DGM production ability, C. autotrophica accumulated the least Hg, but was the most sensitive due to low PC induction and β-HgS formation. Of the added Hg(II), less than 5% was reduced to DGM per day in all species. Of the intracellular Hg, <20% and 20-90% were chelated by PCs and transformed into β-HgS, respectively. These results suggest that intracellular biotransformation might be more important than bioavailability regulation in Hg(II) detoxification in marine phytoplankton.
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Affiliation(s)
- Yun Wu
- Division of Life Science, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong
| | - Wen-Xiong Wang
- Division of Life Science, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong.
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Bravo AG, Cosio C, Amouroux D, Zopfi J, Chevalley PA, Spangenberg JE, Ungureanu VG, Dominik J. Extremely elevated methyl mercury levels in water, sediment and organisms in a Romanian reservoir affected by release of mercury from a chlor-alkali plant. WATER RESEARCH 2014; 49:391-405. [PMID: 24216231 DOI: 10.1016/j.watres.2013.10.024] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Revised: 09/17/2013] [Accepted: 10/09/2013] [Indexed: 05/25/2023]
Abstract
We examined mercury (Hg) biogeochemistry and biomagnification in the Babeni Reservoir, a system strongly affected by the release of Hg from a chlor-alkali plant. Total mercury (THg) concentrations in river water reached 88 ng L(-1) but decreased rapidly in the reservoir (to 9 ng L(-1)). In contrast, monomethylmercury (MMHg) concentrations increased from the upstream part of the reservoir to the central part (0.7 ng L(-1)), suggesting high methylation within the reservoir. Moreover, vertical water column profiles of THg and MMHg indicated that Hg methylation mainly occurred deep in the water column and at the sediment-water interface. The discharge of Hg from a chlor-alkali plant in Valcea region caused the highest MMHg concentrations ever found in non-piscivorous fish worldwide. MMHg concentrations and bioconcentration factors (BCF) of plankton and macrophytes revealed that the highest biomagnification of MMHg takes place in primary producers.
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Affiliation(s)
- Andrea Garcia Bravo
- Institute F.-A. Forel, University of Geneva, 10, Route de Suisse, 1290 Versoix, Switzerland.
| | - Claudia Cosio
- Institute F.-A. Forel, University of Geneva, 10, Route de Suisse, 1290 Versoix, Switzerland
| | - David Amouroux
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, IPREM UMR 5254 CNRS - Université de Pau et des Pays de l'Adour, Hélioparc, 64053 Pau, France
| | - Jakob Zopfi
- Environmental Geosciences, University of Basel, Bernoullistrasse 30, 4056 Basel, Switzerland
| | | | - Jorge E Spangenberg
- Institute of Earth Sciences, University of Lausanne, 1015 Lausanne, Switzerland
| | | | - Janusz Dominik
- Institute F.-A. Forel, University of Geneva, 10, Route de Suisse, 1290 Versoix, Switzerland
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Grégoire DS, Poulain AJ. A little bit of light goes a long way: the role of phototrophs on mercury cycling. Metallomics 2014; 6:396-407. [DOI: 10.1039/c3mt00312d] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Cardoso PG, Marques SC, D'Ambrosio M, Pereira E, Duarte AC, Azeiteiro UM, Pardal MÂ. Changes in zooplankton communities along a mercury contamination gradient in a coastal lagoon (Ria de Aveiro, Portugal). MARINE POLLUTION BULLETIN 2013; 76:170-7. [PMID: 24064374 DOI: 10.1016/j.marpolbul.2013.09.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 08/27/2013] [Accepted: 09/01/2013] [Indexed: 05/22/2023]
Abstract
The main objective of this paper was to evaluate the impact of mercury on the zooplankton communities' structure and functioning and their bioaccumulation patterns along a contamination gradient in a temperate coastal lagoon. Our results demonstrated that total abundance was not negatively affected by Hg contamination, since the most contaminated areas presented the highest values, being the copepod Acartia tonsa the dominant species, which means that it is a very well adapted and tolerant species to mercury. Nevertheless, negative effects were observed in terms of species diversity, since the most contaminated areas presented the lowest values of species richness, evenness and heterogeneity. Moreover, the spatial mercury gradient was reflected on the bioaccumulation patterns of the zooplankton communities. This reinforces the idea that zooplankton can be considered as an important vehicle of mercury transfer through the food pelagic web since it constitutes a primordial food resource for several commercial fish species.
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Affiliation(s)
- Patrícia Gonçalves Cardoso
- IMAR - Institute of Marine Research, Department of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal.
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Wu Y, Wang WX. Differential acclimation of a marine diatom to inorganic mercury and methylmercury exposure. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2013; 138-139:52-59. [PMID: 23707793 DOI: 10.1016/j.aquatox.2013.04.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 04/21/2013] [Accepted: 04/24/2013] [Indexed: 06/02/2023]
Abstract
Aquatic organisms originating from metal polluted water may exhibit differences in their sensitivity to metals, but the underlying physiological mechanisms resulting in such responses have not been well reported. In the present study, a marine diatom Thalassiosira weissflogii was chronically exposed to different inorganic mercury (Hg(II), 0.5 and 5 μg Hg/L) or methylmercury (MeHg, 0.02 and 0.4 μg Hg/L) concentrations for over 18 generations. We then quantified the changes in the Hg(II) or MeHg sensitivity, Hg accumulation, subcellular distribution, as well as thiol compound induction in the diatoms. We found an unchanged tolerance to Hg(II) but an enhanced tolerance to MeHg in the preconditioned T. weissflogii. The underlying mechanisms may be related to the changes in cellular mercury accumulation and the detoxification ability of the cells. Specifically, exposure to high-Hg(II) led to increased metal distribution in cellular debris fraction, as well as the induction of a variety of non-protein thiol compounds, but the uptake kinetics was not significantly modified by Hg(II) exposure. Instead, exposure to high-MeHg decreased the mercury uptake rate along with the synthesis of glutathione (GSH) and (γ-EC)₂-Gly (PC₂). All these responses contributed to the different tolerance developments between Hg(II) and MeHg. This study suggests that moderation of Hg bioavailability was probably more important than internal detoxification in the development of Hg acclimation in marine diatoms.
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Affiliation(s)
- Yun Wu
- Division of Life Science, The Hong Kong University of Science and Technology-HKUST, Clear Water Bay, Kowloon, Hong Kong
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Wang WX. Dietary toxicity of metals in aquatic animals: Recent studies and perspectives. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s11434-012-5413-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Wu Y, Wang WX. Thiol compounds induction kinetics in marine phytoplankton during and after mercury exposure. JOURNAL OF HAZARDOUS MATERIALS 2012; 217-218:271-8. [PMID: 22476094 DOI: 10.1016/j.jhazmat.2012.03.024] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Revised: 03/07/2012] [Accepted: 03/09/2012] [Indexed: 05/20/2023]
Abstract
We investigated the kinetics of Hg(II) and MeHg accumulation and the synthesis of phytochelatins (PCs), cysteine (Cys), glutathione (GSH), and γ-glutamylcysteine (γ-EC) in a marine diatom Thalassiosira weissflogii during a 3-h (short-term) and a 96-h (long-term) exposure period, and during a subsequent 96-h recovery period. MeHg induced the synthesis of a significant level of GSH, but it was Hg(II) that gave rise to significant levels of other non-protein thiol compounds. The thiol compounds Cys, γ-EC, and PC(2-3) were induced in T. weissflogii within the first 30 min of exposure, followed by PC(4), but the concentrations of all six compounds returned to the control levels after the 96-h recovery period. The kinetics of these non-protein thiol compounds pointed to a rapid cellular response to environmental mercury pollution. After a first decrease, the molar ratio of PC-SH (sulfhydryl in PCs) to intracellular Hg increased slightly which demonstrated the role of PCs in Hg(II) detoxification. However, PC-SH was bound with Hg(II) at a stoichiometric ratio of 0.1-0.3, indicating the involvement of other detoxification mechanisms. Elucidating the effects of mercury on intracellular non-protein thiol pools may help us better understand the metal detoxification in phytoplankton.
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Affiliation(s)
- Yun Wu
- Division of Life Science, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong
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Wu Y, Zeng Y, Qu JY, Wang WX. Mercury effects on Thalassiosira weissflogii: applications of two-photon excitation chlorophyll fluorescence lifetime imaging and flow cytometry. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2012; 110-111:133-140. [PMID: 22293220 DOI: 10.1016/j.aquatox.2012.01.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Revised: 12/20/2011] [Accepted: 01/03/2012] [Indexed: 05/31/2023]
Abstract
The toxic effects of inorganic mercury [Hg(II)] and methylmercury (MeHg) on the photosynthesis and population growth in a marine diatom Thalassiosira weissflogii were investigated using two methods: two-photon excitation fluorescence lifetime imaging (FLIM) and flow cytometry (FCM). For photosynthesis, Hg(II) exposure increased the average chlorophyll fluorescence lifetime, whereas such increment was not found under MeHg stress. This may be caused by the inhibitory effect of Hg(II) instead of MeHg on the electron transport chain. For population growth, modeled specific growth rate data showed that the reduction in population growth by Hg(II) mainly resulted from an increased number of injured cells, while the live cells divided at the normal rates. However, MeHg inhibitory effects on population growth were contributed by the reduced division rates of all cells. Furthermore, the cell images and the FCM data reflected the morphological changes of diatom cells under Hg(II)/MeHg exposure vividly and quantitatively. Our results demonstrated that the toxigenicity mechanisms between Hg(II) and MeHg were different in the algal cells.
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Affiliation(s)
- Yun Wu
- Division of Life Science, Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, PR China
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