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Zheng M, Li H, Guo X, Chen B, Wang M. A semi-continuous efficient strategy for removing phosphorus and nitrogen from eel aquaculture wastewater using the self-flocculating microalga Desmodesmus sp. PW1. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 346:118970. [PMID: 37716168 DOI: 10.1016/j.jenvman.2023.118970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 08/29/2023] [Accepted: 09/09/2023] [Indexed: 09/18/2023]
Abstract
The phosphorus content in eel aquaculture wastewater exceeds the discharge standard, and the amount of wastewater discharged is substantial. Therefore, there is an urgent need to explore an economical and efficient method of treating aquaculture wastewater. This study explored the use of Desmodesmus sp. PW1, a type of microalgae, to treat eel aquaculture wastewater. By optimizing the conditions, Desmodesmus sp. PW1 achieved a total phosphorus (TP) removal efficiency of 92.3%, as well as total nitrogen (TN) and ammonia nitrogen (NH4+-N) removal efficiency of 99%, using a photoperiod of 24:0, a temperature of 25 °C, and an inoculation amount of 15%. Furthermore, Desmodesmus sp. PW1 demonstrated a high self-flocculating efficiency (>90%) within 100 min of settling, which facilitated biomass recovery. Subsequently, a semi-continuous treatment process mode was established with a sewage renewal rate of 90%. The results showed that after four rounds of sewage renewal operations, the microalgae biomass in the sewage treatment system could be maintained between 160.0 and 220.0 mg/L, and the average removal rate of TP was 0.13 mg/(L * h). The lipid content of algae cells collected in the semi-continuous treatment system for eel aquaculture wastewater was as high as 36.5%, and the biodiesel properties met the biodiesel standards authorized by Europe and the United States. Overall, this study provides an economical and effective strategy for converting wastewater into high-value microalgae products.
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Affiliation(s)
- Mingmin Zheng
- College of Life Science, Fujian Normal University, Fuzhou 350117, China; Engineering Research Center of Industrial Microbiology, Ministry of Education, Fujian Normal University, Fuzhou 350117,China
| | - Huixian Li
- College of Life Science, Fujian Normal University, Fuzhou 350117, China
| | - Xu Guo
- College of Life Science, Fujian Normal University, Fuzhou 350117, China
| | - Bilian Chen
- College of Life Science, Fujian Normal University, Fuzhou 350117, China; Engineering Research Center of Industrial Microbiology, Ministry of Education, Fujian Normal University, Fuzhou 350117,China
| | - Mingzi Wang
- College of Life Science, Fujian Normal University, Fuzhou 350117, China; Engineering Research Center of Industrial Microbiology, Ministry of Education, Fujian Normal University, Fuzhou 350117,China.
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2
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Althobaiti F, Sahyon HA, Shanab MMAH, Aldhahrani A, Helal MA, Khireldin A, Shoair AGF, Almalki ASA, Fathy AM. A comparative study of novel ruthenium(III) and iron(III) complexes containing uracil; docking and biological studies. J Inorg Biochem 2023; 247:112308. [PMID: 37441923 DOI: 10.1016/j.jinorgbio.2023.112308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 06/25/2023] [Accepted: 06/27/2023] [Indexed: 07/15/2023]
Abstract
Structural and biological studies were conducted on the novel complexes [Fe(U)2(H2O)2]Cl3 (FeU) and [Ru(U)2(H2O)2]Cl3 (RuU) (U = 5,6-Diamino-1,3-dimethylpyrimidine-2,4(1H,3H)-dione) to develop an anticancer drug candidate. The two complexes have been synthesized and characterized. Based on our findings, these complexes have octahedral geometry. The DNA-binding study proved that both complexes coordinated with CT-DNA. The docking study confirmed the potency of both complexes in downregulating the topoisomerase I protein through their high binding affinity. Biological studies have established that both complexes can act as potent anticancer agents against three cancer cell lines. RuU or FeU complexes induce apoptosis in breast cancer cells by increasing caspase9 protein and inhibiting proliferating cell nuclear antigen (PCNA) activity. In addition, both complexes down-regulate topoisomerase I expression in breast cancer cells. Therefore, the RuU and FeU complexes' anticancer activities were mediated via both apoptosis induction and topoisomerase I down-regulation. In conclusion, both complexes have dual anticancer activity pathways that may be responsible for the selective cytotoxicity of the complexes. This makes them more suitable for the development of novel cancer treatment strategies.
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Affiliation(s)
- Fayez Althobaiti
- Department of Biotechnology, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia.
| | - Heba A Sahyon
- Chemistry Department, Faculty of Science, Kafrelsheikh University, 33516 Kafrelsheikh, Egypt.
| | - Mai M A H Shanab
- Department of Chemistry, College of Sciences and Humanities Studies (Girls section), Hawtat Bani Tamim 11149, Prince Sattam Bin Abdulaziz University, P.O. Box:13, Saudi Arabia.
| | - Adil Aldhahrani
- Clinical Laboratory Science Department, Turabah University College, Taif University, Taif 21995, Saudi Arabia.
| | - Marihan A Helal
- Chemistry Department, Faculty of Science, Damietta University, Damietta, Egypt
| | - Awad Khireldin
- Air transport management, Singapore Institute of Technology (SIT), Singapore.
| | - Abdel Ghany F Shoair
- Department of Science and Technology, University College-Ranyah, postcode 21975, Taif University, Saudi Arabia; High Altitude Research Center, Taif University, 21944, Saudi Arabia.
| | | | - Ahmed M Fathy
- Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt
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3
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Staerz AF, van Leeuwen M, Priamushko T, Saatkamp T, Endrődi B, Plankensteiner N, Jobbagy M, Pahlavan S, Blom MJW, Janáky C, Cherevko S, Vereecken PM. Effects of Iron Species on Low Temperature CO 2 Electrolyzers. Angew Chem Int Ed Engl 2023:e202306503. [PMID: 37466922 DOI: 10.1002/anie.202306503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 07/15/2023] [Accepted: 07/17/2023] [Indexed: 07/20/2023]
Abstract
Electrochemical energy conversion devices are considered key in reducing CO2 emissions and significant efforts are being applied to accelerate device development. Unlike other technologies, low temperature electrolyzers have the ability to directly convert CO2 into a range of value-added chemicals. To make them commercially viable, however, device efficiency and durability must be increased. Although their design is similar to more mature water electrolyzers and fuel cells, new cell concepts and components are needed. Due to the complexity of the system, singular component optimization is common. As a result, the component interplay is often overlooked. The influence of Fe-species clearly shows that the cell must be considered holistically during optimization, to avoid future issues due to component interference or cross-contamination. Fe-impurities are ubiquitous, and their influence on single components is well-researched. The activity of non-noble anodes has been increased through the deliberate addition of iron. At the same time, however, Fe-species accelerate cathode and membrane degradation. Here, we interpret literature on single components to gain an understanding of how Fe-species influence low temperature CO2 electrolyzers holistically. The role of Fe-species serves to highlight the need for considerations regarding component interplay in general.
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Affiliation(s)
- Anna F Staerz
- IMEC Leuven, Kapeldreef 75, 3001, Leuven, Belgium
- Energyville, Thor Park 8320, 3600, Genk, Belgium
- Department of Microbial and Micromolecular systems (M2S), cMACS, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium
| | - Marieke van Leeuwen
- IMEC Leuven, Kapeldreef 75, 3001, Leuven, Belgium
- Energyville, Thor Park 8320, 3600, Genk, Belgium
- Department of Microbial and Micromolecular systems (M2S), cMACS, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium
| | - Tatiana Priamushko
- Forschungszentrum Jülich GmbH, Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11) Cauerstraße 1, 91058, Erlangen, Germany
| | - Torben Saatkamp
- Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
| | - Balázs Endrődi
- Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich sq. 1., 6720, Szeged, Hungary
| | - Nina Plankensteiner
- IMEC Leuven, Kapeldreef 75, 3001, Leuven, Belgium
- Energyville, Thor Park 8320, 3600, Genk, Belgium
- Department of Microbial and Micromolecular systems (M2S), cMACS, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium
| | - Matias Jobbagy
- IMEC Leuven, Kapeldreef 75, 3001, Leuven, Belgium
- Energyville, Thor Park 8320, 3600, Genk, Belgium
| | - Sohrab Pahlavan
- IMEC Leuven, Kapeldreef 75, 3001, Leuven, Belgium
- Energyville, Thor Park 8320, 3600, Genk, Belgium
- Department of Microbial and Micromolecular systems (M2S), cMACS, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium
| | - Martijn J W Blom
- IMEC Leuven, Kapeldreef 75, 3001, Leuven, Belgium
- Energyville, Thor Park 8320, 3600, Genk, Belgium
| | - Csaba Janáky
- Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich sq. 1., 6720, Szeged, Hungary
- eChemicles Zrt., Alsó Kikötő sor 11, 6726, Szeged, Hungary
| | - Serhiy Cherevko
- Forschungszentrum Jülich GmbH, Helmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11) Cauerstraße 1, 91058, Erlangen, Germany
| | - Philippe M Vereecken
- IMEC Leuven, Kapeldreef 75, 3001, Leuven, Belgium
- Energyville, Thor Park 8320, 3600, Genk, Belgium
- Department of Microbial and Micromolecular systems (M2S), cMACS, KU Leuven, Celestijnenlaan 200F, 3001, Leuven, Belgium
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4
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Popa DG, Lupu C, Constantinescu-Aruxandei D, Oancea F. Humic Substances as Microalgal Biostimulants—Implications for Microalgal Biotechnology. Mar Drugs 2022; 20:md20050327. [PMID: 35621978 PMCID: PMC9143693 DOI: 10.3390/md20050327] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 05/11/2022] [Accepted: 05/12/2022] [Indexed: 02/01/2023] Open
Abstract
Humic substances (HS) act as biostimulants for terrestrial photosynthetic organisms. Their effects on plants are related to specific HS features: pH and redox buffering activities, (pseudo)emulsifying and surfactant characteristics, capacity to bind metallic ions and to encapsulate labile hydrophobic molecules, ability to adsorb to the wall structures of cells. The specific properties of HS result from the complexity of their supramolecular structure. This structure is more dynamic in aqueous solutions/suspensions than in soil, which enhances the specific characteristics of HS. Therefore, HS effects on microalgae are more pronounced than on terrestrial plants. The reported HS effects on microalgae include increased ionic nutrient availability, improved protection against abiotic stress, including against various chemical pollutants and ionic species of potentially toxic elements, higher accumulation of value-added ingredients, and enhanced bio-flocculation. These HS effects are similar to those on terrestrial plants and could be considered microalgal biostimulant effects. Such biostimulant effects are underutilized in current microalgal biotechnology. This review presents knowledge related to interactions between microalgae and humic substances and analyzes the potential of HS to enhance the productivity and profitability of microalgal biotechnology.
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Affiliation(s)
- Daria Gabriela Popa
- Faculty of Biotechnologies, University of Agronomic Sciences and Veterinary Medicine of Bucharest, Mărăști Blv, No. 59, Sector 1, 011464 Bucharest, Romania;
- Bioproducts Team, Bioresources Department, National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, Splaiul Independenței No. 202, Sector 6, 060021 Bucharest, Romania;
| | - Carmen Lupu
- Bioproducts Team, Bioresources Department, National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, Splaiul Independenței No. 202, Sector 6, 060021 Bucharest, Romania;
| | - Diana Constantinescu-Aruxandei
- Bioproducts Team, Bioresources Department, National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, Splaiul Independenței No. 202, Sector 6, 060021 Bucharest, Romania;
- Correspondence: (D.C.-A.); (F.O.)
| | - Florin Oancea
- Faculty of Biotechnologies, University of Agronomic Sciences and Veterinary Medicine of Bucharest, Mărăști Blv, No. 59, Sector 1, 011464 Bucharest, Romania;
- Bioproducts Team, Bioresources Department, National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, Splaiul Independenței No. 202, Sector 6, 060021 Bucharest, Romania;
- Correspondence: (D.C.-A.); (F.O.)
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5
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Sathishkumar K, Li Y, Alsalhi MS, Muthukumar B, Gaurav GK, Devanesan S, Rajasekar A, Manikandan R. Enhanced biological nitrate removal by gC 3N 4/TiO 2 composite and role of extracellular polymeric substances. ENVIRONMENTAL RESEARCH 2022; 207:112158. [PMID: 34606840 DOI: 10.1016/j.envres.2021.112158] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/17/2021] [Accepted: 09/27/2021] [Indexed: 06/13/2023]
Abstract
The biological denitrification in the presence of gC3N4 doped TiO2 composite was investigated through series of batch experiment. gC3N4 doped TiO2 was synthesized and characterized by FT-IR, XRD, SEM-EDAX and the prepared composite used as electron donor for the enhancement biological denitrification. The role of extracellular polymeric substances in the biological nitrate reduction and electron transfer process has been elucidated. The XRD result confirms that TiO2 nanoparticle has 80% anatase and 20% rutile phase. The gC3N4 shows the diffraction peaks at 27.57°, corresponds to the diffraction planes of (002) the hexagonal graphitic carbon nitride. The SEM image of modified gC3N4/TiO2 nanocomposites showed agglomerated small spherical TiO2 nanoparticles attached on the surface of gC3N4. The highest level of nitrate removal was 90% (from 100 mg/L to 10 mg/L nitrate) in gC3N4/TiO2 nanocomposite in the 15% wt TiO2 doped gC3N4. The nitrate reduction in the biofilm with gC3N4 doped TiO2 composite have significantly enhanced the nitrate reduction than the control. Photoexcited electrons were generated from gC3N4 doped TiO2 photocatalyst act as excellent electron donor to the microbial communities. Extracellular polymeric substances acted as a passing media for microbial extracellular electron transfer and protective barrier for microbes. The electroactive microbes were harvested electrons from the gC3N4 doped TiO2 composite under irradiation and enhancing the biological nitrate reduction. Overall, the present study suggests that insight into the mechanism of photoexcited electron facilitated biological nitrate reduction and role of extracellular polymeric substances. The successful integration of gC3N4 doped TiO2 photocatalyst and biofilm is a promising technology for nitrate removal.
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Affiliation(s)
- Kuppusamy Sathishkumar
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China
| | - Yi Li
- Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, PR China.
| | - Mohamad S Alsalhi
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Balakrishnan Muthukumar
- Environmental Molecular Microbiology Research Laboratory, Department of Biotechnology, Thiruvalluvar University, Vellore, 632 115, India
| | - Gajendra Kumar Gaurav
- Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes and College of Civil, Hohai University, Nanjing, 210098, PR China
| | - Sandhanasamy Devanesan
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Aruliah Rajasekar
- Environmental Molecular Microbiology Research Laboratory, Department of Biotechnology, Thiruvalluvar University, Vellore, 632 115, India
| | - Ramalingam Manikandan
- Department of Energy & Materials Engineering, Dongguk University, Seoul, South Korea
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6
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Henríquez A, Salgado P, Albornoz M, Melín V, Mansilla HD, Cornejo-Ponce L, Contreras D. Determination of equilibrium constants of iron( iii)-1,2-dihydroxybenzene complexes and the relationship between calculated iron speciation and degradation of rhodamine B. NEW J CHEM 2021. [DOI: 10.1039/d1nj01579f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The contribution of the monocomplex [Fe(DHB)]+ to the percentage of rhodamine B degradation is statistically significant.
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Affiliation(s)
- Adolfo Henríquez
- Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Tarapacá, Avda. General Velásquez 1775, Arica 1000007, Chile
| | - Pablo Salgado
- Departamento de Ingeniería Civil, Facultad de Ingeniería, Universidad Católica de la Santísima Concepción, Alonso de Ribera 2850, Concepción, Chile
| | - Milenka Albornoz
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción 4070386, Chile
| | - Victoria Melín
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción 4070386, Chile
| | - Héctor D. Mansilla
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción 4070386, Chile
| | - Lorena Cornejo-Ponce
- Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Tarapacá, Avda. General Velásquez 1775, Arica 1000007, Chile
| | - David Contreras
- Facultad de Ciencias Químicas, Universidad de Concepción, Concepción 4070386, Chile
- ANID-Millennium Science Initiative Program-Millennium Nuclei on Catalytic Process towards Sustainable Chemistry (CSC), Chile
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7
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Liu J, Qiu Y, He L, Luo K, Wang Z. Effect of iron and phosphorus on the microalgae growth in co-culture. Arch Microbiol 2020; 203:733-740. [PMID: 33044622 DOI: 10.1007/s00203-020-02074-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 07/12/2020] [Accepted: 10/01/2020] [Indexed: 11/28/2022]
Abstract
Iron and phosphorus (P) are the important micro- and macro-nutrient for microalgae growth, respectively. However, the effect of iron and P on microalgae growth in co-culture associating with the formation of dominate algae has not been investigated before. In the current study, Anabaene flos-aquae, Chlorella vulgaris and Melosira sp. were co-cultivated under the addition of different initial iron and P to reveal the effect of iron and phosphorus on the growth of microalgae. The results showed that the mean growth rate of A. flos-aquae, C. vulgaris and Melosira was 0.270, 0.261 and 0.062, respectively, indicating that the A. flos-aquae and C. vulgaris algae are liable to be the dominant algae while the growth of Melosira was restrained when co-cultured. The ratio of Fe to P has a significant impact on the growth of microalgae and could be regarded as an indicator of algae growth. Microalgae showed a much more obvious uptake of iron compared to that of P. The information obtained in the current study was useful for the forecast of water quality and the control of microalgae bloom.
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Affiliation(s)
- Junxia Liu
- School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Yongting Qiu
- School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
| | - Linjuan He
- School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Keshu Luo
- School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, China
| | - Zhihong Wang
- School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou, 510006, China.
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8
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Revealing the main factors and two-way interactions contributing to food discolouration caused by iron-catechol complexation. Sci Rep 2020; 10:8288. [PMID: 32427917 PMCID: PMC7237488 DOI: 10.1038/s41598-020-65171-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 04/24/2020] [Indexed: 11/29/2022] Open
Abstract
Fortification of food with iron is considered to be an effective approach to counter the global health problem caused by iron deficiency. However, reactivity of iron with the catechol moiety of food phenolics leads to discolouration and impairs bioavailability. In this study, we investigated the interplay between intrinsic and extrinsic factors on food discolouration caused by iron-catechol complexation. To this end, a three-level fractional factorial design was implemented. Absorbance spectra were analysed using statistical methods, including PCA, HCA, and ANOVA. Furthermore, a direct link between absorbance spectra and stoichiometry of the iron-catechol complexes was confirmed by ESI-Q-TOF-MS. All statistical methods confirm that the main effects affecting discolouration were type of iron salt, pH, and temperature. Additionally, several two-way interactions, such as type of iron salt × pH, pH × temperature, and type of iron salt × concentration significantly affected iron-catechol complexation. Our findings provide insight into iron-phenolic complexation-mediated discolouration, and facilitate the design of iron-fortified foods.
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Guan J, Qi K, Wang J, Zhuang J, Yuan X, Yan B, Lu N, Qu J. Effects of conversion from boreal natural wetlands to rice paddy fields on the dynamics of total dissolved iron during extreme precipitation events. CHEMOSPHERE 2020; 242:125153. [PMID: 31669999 DOI: 10.1016/j.chemosphere.2019.125153] [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: 08/04/2019] [Revised: 10/13/2019] [Accepted: 10/18/2019] [Indexed: 06/10/2023]
Abstract
Natural wetlands play a critical role in increasing the total dissolved Fe (TDFe) concentration in boreal fluvial systems. In the Sanjiang Plain, which is the largest concentrated distribution area of natural wetlands in China, over 80% of the natural wetlands have been converted to rice paddy fields (RPFs) during the last six decades; the altered hydrological processes are hypothesized to influence the dynamics of TDFe, particularly during extreme precipitation events (EPEs). In the current study, the TDFe dynamics in typical natural freshwater wetlands in the Sanjiang Plain were elucidated. The TDFe species including Fe(II), Fe(III) and colloidal Fe, were monitored in a Deyeucia angustifolia wetland (DAW), Carex lasiocarpa wetland (CLW), and RPF during the rainy season from 2012 to 2014. Compared to normal precipitation days, the average TDFe concentration increased significantlys in all wetlands during the EPEs, among which the fluctuation of TDFe during the EPEs was more largely in the RPF than in the natural wetlands. The dynamics of the TDFe speciation in the different wetlands also showed different patterns; moreover, TDFe and its species showed a significantly positive relationship with dissolved organic matter. With an increasing frequency of EPEs anticipated by climate change models, our results suggest higher levels of TDFe will be transported to the Amur River and Okhotsk Sea, which may potentially affect TDFe cycling, water quality and ecosystem dynamics.
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Affiliation(s)
- Jiunian Guan
- School of Environment, Northeast Normal University, Changchun, 130024, PR China; Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, PR China
| | - Kun Qi
- School of Environment, Northeast Normal University, Changchun, 130024, PR China
| | - Junyang Wang
- School of Environment, Northeast Normal University, Changchun, 130024, PR China
| | - Jiahui Zhuang
- School of Environment, Northeast Normal University, Changchun, 130024, PR China
| | - Xing Yuan
- School of Environment, Northeast Normal University, Changchun, 130024, PR China
| | - Baixing Yan
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, PR China
| | - Nan Lu
- School of Environment, Northeast Normal University, Changchun, 130024, PR China.
| | - Jiao Qu
- School of Environment, Northeast Normal University, Changchun, 130024, PR China.
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Xing G, Garg S, Waite TD. Is Superoxide-Mediated Fe(III) Reduction Important in Sunlit Surface Waters? ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:13179-13190. [PMID: 31638396 DOI: 10.1021/acs.est.9b04718] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Two major pathways are reported to account for photochemical reduction of Fe(III) in sunlit surface waters, namely, ligand-to-metal charge transfer (LMCT) and superoxide-mediated iron reduction (SMIR). In this study, we investigate the impact of Fe(III) speciation (organically complexed (Fe(III)L versus iron oxyhydroxide (AFO)) on Fe(III) reducibility by photogenerated superoxide (O2•-) and LMCT. To simulate conditions typical of fresh, estuarine, and coastal waters, we have used Suwannee River Fulvic Acid (SRFA) as a representative of the natural organic matter likely to associate with Fe(III). Our results show that the photolabile Fe(III)SRFA complex is reduced rapidly by LMCT, while O2•- does not play a role in reduction of these entities. In contrast, the relatively less photolabile AFO is reduced by both O2•- and LMCT. The reduction of AFO by O2•- occurs following the dissolution of AFO, and hence, the contribution of O2•- to reductive dissolution of AFO is dependent on conditions such as the age of the AFO and initial AFO concentration affecting the rate of dissolution of AFO. Our results further show that while colloidal Fe(III) (in this work, particles >0.025 μm) is reduced by O2•-, there is no involvement of O2•- in dissolved Fe(III) reduction. Overall, our results show that superoxide-mediated iron reduction will be important only in natural waters containing limited concentrations of Fe binding ligands.
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Affiliation(s)
- Guowei Xing
- School of Civil and Environmental Engineering , The University of New South Wales , Sydney , NSW 2052 , Australia
| | - Shikha Garg
- School of Civil and Environmental Engineering , The University of New South Wales , Sydney , NSW 2052 , Australia
| | - T David Waite
- School of Civil and Environmental Engineering , The University of New South Wales , Sydney , NSW 2052 , Australia
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11
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Indira S, Vinoth G, Bharathi M, Bharathi S, Kalilur Rahiman A, Shanmuga Bharathi K. Catechol oxidase and phenoxazinone synthase mimicking activities of mononuclear Fe(III) and Co(III) complexes of amino-bis(phenolate)-based mixed ligands: Synthesis, spectral and electrochemical studies. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.118988] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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Abinandan S, Subashchandrabose SR, Panneerselvan L, Venkateswarlu K, Megharaj M. Potential of acid-tolerant microalgae, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, in heavy metal removal and biodiesel production at acidic pH. BIORESOURCE TECHNOLOGY 2019; 278:9-16. [PMID: 30669030 DOI: 10.1016/j.biortech.2019.01.053] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Revised: 01/11/2019] [Accepted: 01/12/2019] [Indexed: 05/28/2023]
Abstract
Metals in traces are vital for microalgae but their occurrence at high concentrations in habitats is a serious ecological concern. We investigated the potential of two acid-tolerant microalgae, Desmodesmus sp. MAS1 and Heterochlorella sp. MAS3, isolated from neutral environments, for simultaneous removal of heavy metals such as copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn), and production of biodiesel when grown at pH 3.5. Excepting Cu, the selected metals at concentrations of 10-20 mg L-1 supported good growth of both the strains. Cellular analysis for metal removal revealed the predominance of intracellular mechanism in both the strains resulting in 40-80 and 40-60% removal of Fe and Mn, respectively. In-situ transesterification of biomass indicated enhanced biodiesel yield with increasing concentrations of metals suggesting that both these acid-tolerant microalgae may be the suitable candidates for simultaneous remediation, and sustainable biomass and biodiesel production in environments like metal-rich acid mine drainages.
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Affiliation(s)
- Sudharsanam Abinandan
- Global Centre for Environmental Remediation (GCER), Faculty of Science, ATC Building, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Suresh R Subashchandrabose
- Global Centre for Environmental Remediation (GCER), Faculty of Science, ATC Building, University of Newcastle, Callaghan, NSW 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), University of Newcastle, ATC Building, Callaghan, NSW 2308, Australia
| | - Logeshwaran Panneerselvan
- Global Centre for Environmental Remediation (GCER), Faculty of Science, ATC Building, University of Newcastle, Callaghan, NSW 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), University of Newcastle, ATC Building, Callaghan, NSW 2308, Australia
| | - Kadiyala Venkateswarlu
- Formerly Department of Microbiology, Sri Krishnadevaraya University, Anantapur 515055, India
| | - Mallavarapu Megharaj
- Global Centre for Environmental Remediation (GCER), Faculty of Science, ATC Building, University of Newcastle, Callaghan, NSW 2308, Australia; Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), University of Newcastle, ATC Building, Callaghan, NSW 2308, Australia.
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Krachler R, Krachler R, Valda A, Keppler BK. Natural iron fertilization of the coastal ocean by "blackwater rivers". THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 656:952-958. [PMID: 30625681 DOI: 10.1016/j.scitotenv.2018.11.423] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2018] [Revised: 11/16/2018] [Accepted: 11/28/2018] [Indexed: 05/23/2023]
Abstract
The present study elucidates the role of natural iron fertilization of the coastal ocean by so-called "blackwater rivers". Areas of marsh, fen, peatland, boreal forest etc. are characterized by organic-rich soils. From those soils, humic substances (humic and fulvic acids) are leached to the aquatic system resulting in river water that is low in pH and dark-brown in color. The point is that "blackwater rivers" tend to be rich in dissolved iron due to the unique chelating properties of humic and fulvic acids which bind Fe(III) and keep it in solution. We performed algal physiological (growth rate) experiments under conditions of iron deficiency with the marine unicellular phytoplankton algae Chlorella salina and Diacronema lutheri in 0.2 μm cut-off filtered mixtures of natural "blackwater river" water and synthetic seawater. Our results demonstrate that the iron naturally present in "blackwater rivers" is readily bioavailable to both marine algal species. Furthermore, the humic and fulvic acids exert an additional stimulatory effect on the marine algae. Both algae thrive much better in the presence of natural humic and fulvic acids as compared to a medium where EDTA is used as an iron-chelating agent. Our results indicate that "blackwater rivers", in sharp contrast to other types of rivers, are excellent sources of bioavailable iron to marine phytoplankton. This natural iron fertilization may give rise to photosynthesis-driven sequestration of CO2 from the atmosphere to the sea, as can be seen from the visualization of CO2 surface concentrations by NASA (NASA GEOS-5 model) which shows the global sources and sinks of CO2 localized in time and space. The results by NASA suggest that strong marine CO2 sinks in coastal waters tend to occur close to "blackwater river" estuaries. It is thus evident that "blackwater rivers" act as important sources of a limiting nutrient (iron) to the ocean.
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Affiliation(s)
- Regina Krachler
- University of Vienna, Faculty of Chemistry, Institute of Inorganic Chemistry, Währingerstrasse 42, A-1090 Vienna, Austria.
| | - Rudolf Krachler
- University of Vienna, Faculty of Chemistry, Institute of Inorganic Chemistry, Währingerstrasse 42, A-1090 Vienna, Austria
| | - Alexander Valda
- University of Vienna, Faculty of Chemistry, Institute of Inorganic Chemistry, Währingerstrasse 42, A-1090 Vienna, Austria
| | - Bernhard K Keppler
- University of Vienna, Faculty of Chemistry, Institute of Inorganic Chemistry, Währingerstrasse 42, A-1090 Vienna, Austria
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14
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Kügler S, Cooper RE, Wegner CE, Mohr JF, Wichard T, Küsel K. Iron-organic matter complexes accelerate microbial iron cycling in an iron-rich fen. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 646:972-988. [PMID: 30235650 DOI: 10.1016/j.scitotenv.2018.07.258] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 07/09/2018] [Accepted: 07/18/2018] [Indexed: 06/08/2023]
Abstract
The accessibility of iron (Fe) species for microbial processes is dependent on solubility and redox state, which are influenced by complexation with dissolved organic matter (DOM) and water-extractable organic matter (WEOM). We evaluated the complexation of these pools of organic matter to soluble Fe(II) and Fe(III) in the slightly acidic Schlöppnerbrunnen fen and subsequent effects on Fe(II) oxidation and Fe(III) reduction. We found the majority of soluble Fe(II) and Fe(III) is complexed to DOM. High-resolution mass spectrometry identified potential complexing partners in peat-derived water extracts (PWE), including compound classes known to function as ligands or electron shuttles, like tannins and sulfur-containing compounds. Furthermore, we observed clear differences in the stability of Fe(II)- and Fe(III)-DOM, with more labile complexes dominating the upper, oxic layers (0-10 cm) and more stable complexes in lower, anoxic layers (15-30 cm). Metal isotope-coded profiling identified a single potential chemical formula (C42H57O13N9Fe2) associated with a stable Fe-DOM complex. Fe(III) reduction and Fe(II) oxidation incubations with Geobacter sulfurreducens PCA and Shewanella oneidensis MR-1 or Sideroxydans CL-21, respectively, were used to determine the influence of Fe-DOM complexes on Fe cycling rates. The addition of PWE led to a 2.3-fold increase in Fe(III) reduction rates and 0.5-fold increase in Fe(II) oxidation rates, indicating Fe-DOM complexes greatly influence microbial Fe cycling by potentially serving as electron shuttles. Molecular analyses revealed Fe(III)-reducing and Fe(II)-oxidizing bacteria co-exist across all depths, in approximately equal proportions (representing 0.1-1.0% of the total microbial community), despite observed changes in redox potential. The activity of Fe(III)-reducing bacteria might explain the presence of the detected Fe(II) stabilized via complexation with DOM even under oxic conditions in upper peat layers. Therefore, these Fe(II)-DOM complexes can be recycled by microaerophilic Fe(II)-oxidizers. Taken together, these results suggest Fe-DOM complexation in the fen accelerates microbial-mediated redox processes across the entire redox continuum.
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Affiliation(s)
- Stefan Kügler
- Institute for Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Jena 07743, Germany; Aquatic Geomicrobiology, Institute of Biodiversity, Friedrich Schiller University Jena, Jena 07743, Germany
| | - Rebecca E Cooper
- Aquatic Geomicrobiology, Institute of Biodiversity, Friedrich Schiller University Jena, Jena 07743, Germany
| | - Carl-Eric Wegner
- Aquatic Geomicrobiology, Institute of Biodiversity, Friedrich Schiller University Jena, Jena 07743, Germany
| | - Jan Frieder Mohr
- Institute for Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Jena 07743, Germany
| | - Thomas Wichard
- Institute for Inorganic and Analytical Chemistry, Friedrich Schiller University Jena, Jena 07743, Germany
| | - Kirsten Küsel
- Aquatic Geomicrobiology, Institute of Biodiversity, Friedrich Schiller University Jena, Jena 07743, Germany; The German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Leipzig 04103, Germany.
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15
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Zhu N, Wu Y, Tang J, Duan P, Yao L, Rene ER, Wong PK, An T, Dionysiou DD. A New Concept of Promoting Nitrate Reduction in Surface Waters: Simultaneous Supplement of Denitrifiers, Electron Donor Pool, and Electron Mediators. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:8617-8626. [PMID: 29966090 DOI: 10.1021/acs.est.8b01605] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The efficiency of biological nitrate reduction depends on the community composition of microorganisms, the electron donor pool, and the electron mediators participating in the biological reduction process. This study aims at creating an in situ system comprising of denitrifiers, electron donors, and electron mediators to reduce nitrate in surface waters. The ubiquitous periphytic biofilm in waters was employed to promote in situ nitrate reduction in the presence of titanium dioxide (TiO2) nanoparticles (NPs). The nitrate removal rate in the periphytic biofilm and TiO2 NPs system was significantly higher than the control (only periphytic biofilm or TiO2 NPs). TiO2 NPs optimized the community composition of periphytic biofilm for nitrate reduction by increasing the relative abundance of four dominant denitrifying bacteria. Periphytic biofilm showed a substantial increase in extracellular polymeric substance, especially the humic acid and protein content, due to the presence of TiO2 NPs. The synergistic action of humic acid, protein, denitrifying bacteria of the periphytic biofilm, and TiO2 NPs contributed to 80% of the nitrate reduction. The protein and humic acid, acting as electron mediators, facilitated the transfer of exogenous electrons from photoexcited TiO2 NPs to periphytic biofilm containing denitrifiers, which enhanced nitrate reduction in surface waters.
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Affiliation(s)
- Ningyuan Zhu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Sciences , Chinese Academy of Sciences , 71 East Beijing Road , Nanjing 210008 , China
- College of Resource and Environment , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Yonghong Wu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Sciences , Chinese Academy of Sciences , 71 East Beijing Road , Nanjing 210008 , China
| | - Jun Tang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Sciences , Chinese Academy of Sciences , 71 East Beijing Road , Nanjing 210008 , China
- College of Resource and Environment , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Pengfei Duan
- Collaborative Innovation Center of Water Security for Water Source, Region of Mid-line of South-to-North Diversion Project , Nanyang Normal University , Nanyang 473061 , Henan , China
| | - Lunguang Yao
- Collaborative Innovation Center of Water Security for Water Source, Region of Mid-line of South-to-North Diversion Project , Nanyang Normal University , Nanyang 473061 , Henan , China
| | - Eldon R Rene
- Department of Environmental Engineering and Water Technology , IHE Delft Institute for Water Education , Westvest 7 , 2611 AX Delft , The Netherlands
| | - Po Keung Wong
- School of Life Sciences , The Chinese University of Hong Kong , Shatin, NT, Hong Kong , SAR , China
| | - Taicheng An
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control , Guangdong University of Technology , Guangzhou , 510006 , China
| | - Dionysios D Dionysiou
- Department of Chemical and Environmental Engineering (ChEE), 705 Engineering Research Center , University of Cincinnati , Cincinnati , Ohio 45221-0012 , United States
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16
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Spiegel MT, Hoogerbrugge A, Truksa S, Smith AG, Shuford KL, Klausmeyer KK, Farmer PJ. Synthesis of first row transition metal selenomaltol complexes. Dalton Trans 2018; 47:9030-9037. [DOI: 10.1039/c8dt01170b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Complexation of selenomaltol to transition metal ions promotes a zwitterionic resonance form.
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Affiliation(s)
| | | | - Shamus Truksa
- Department of Chemistry and Biochemistry
- Baylor University
- Waco
- USA
| | - Andrew G. Smith
- Department of Chemistry and Biochemistry
- Baylor University
- Waco
- USA
| | - Kevin L. Shuford
- Department of Chemistry and Biochemistry
- Baylor University
- Waco
- USA
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17
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Yang R, Su H, Qu S, Wang X. Capacity of humic substances to complex with iron at different salinities in the Yangtze River estuary and East China Sea. Sci Rep 2017; 7:1381. [PMID: 28469240 PMCID: PMC5431113 DOI: 10.1038/s41598-017-01533-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 03/30/2017] [Indexed: 11/09/2022] Open
Abstract
The iron binding capacities (IBC) of fulvic acid (FA) and humic acid (HA) were determined in the salinity range from 5 to 40. The results indicated that IBC decreased while salinity increased. In addition, dissolved iron (dFe), FA and HA were also determined along the Yangtze River estuary’s increasing salinity gradient from 0.14 to 33. The loss rates of dFe, FA and HA in the Yangtze River estuary were up to 96%, 74%, and 67%, respectively. The decreases in dFe, FA and HA, as well as the change in IBC of humic substances (HS) along the salinity gradient in the Yangtze River estuary were all well described by a first-order exponential attenuation model: y(dFe/FA/HA, S) = a0 × exp(kS) + y0. These results indicate that flocculation of FA and HA along the salinity gradient resulted in removal of dFe. Furthermore, the exponential attenuation model described in this paper can be applied in the major estuaries of the world where most of the removal of dFe and HS occurs where freshwater and seawater mix.
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Affiliation(s)
- Rujun Yang
- College of Chemistry and Chemical Engineering, Ocean University of China, Songling Road 238, Qingdao, 266100, P.R. China.
| | - Han Su
- College of Chemistry and Chemical Engineering, Ocean University of China, Songling Road 238, Qingdao, 266100, P.R. China
| | - Shenglu Qu
- College of Chemistry and Chemical Engineering, Ocean University of China, Songling Road 238, Qingdao, 266100, P.R. China
| | - Xuchen Wang
- College of Chemistry and Chemical Engineering, Ocean University of China, Songling Road 238, Qingdao, 266100, P.R. China
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18
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Orlowska E, Enyedy ÉA, Pignitter M, Jirsa F, Krachler R, Kandioller W, Keppler BK. β-O-4 type dilignol compounds and their iron complexes for modeling of iron binding to humic acids: synthesis, characterization, electrochemical studies and algal growth experiments. NEW J CHEM 2017. [DOI: 10.1039/c7nj02328f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of β-O-4 type dilignols and their iron(iii) complexes were evaluated as model compounds for humic acids.
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Affiliation(s)
- Ewelina Orlowska
- Institute of Inorganic Chemistry
- Faculty of Chemistry
- University of Vienna
- A-1090 Vienna
- Austria
| | - Éva A. Enyedy
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- H-6720 Szeged
- Hungary
| | - Marc Pignitter
- Department of Physiological Chemistry
- Faculty of Chemistry
- University of Vienna
- A-1090 Vienna
- Austria
| | - Franz Jirsa
- Institute of Inorganic Chemistry
- Faculty of Chemistry
- University of Vienna
- A-1090 Vienna
- Austria
| | - Regina Krachler
- Institute of Inorganic Chemistry
- Faculty of Chemistry
- University of Vienna
- A-1090 Vienna
- Austria
| | - Wolfgang Kandioller
- Institute of Inorganic Chemistry
- Faculty of Chemistry
- University of Vienna
- A-1090 Vienna
- Austria
| | - Bernhard K. Keppler
- Institute of Inorganic Chemistry
- Faculty of Chemistry
- University of Vienna
- A-1090 Vienna
- Austria
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