1
|
Dai Y, Ma S, Lu H, Zhang Z, Xu J, Zhu K, Wang Z, Zhu L, Jia H. Arsenite adsorption and oxidation affected by soil humin: The significant role of persistent free radicals and reactive oxygen species. JOURNAL OF HAZARDOUS MATERIALS 2024; 468:133799. [PMID: 38377907 DOI: 10.1016/j.jhazmat.2024.133799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 01/10/2024] [Accepted: 02/13/2024] [Indexed: 02/22/2024]
Abstract
Humin (HM), as the main component of soil organic matter, carries various reactive groups and plays a crucial regulatory role in the transformation of arsenic (As). However, current research on the redox pathway of As and its interactions with HM is relatively limited. This study aimed to explore the impact of different HM samples on the redox characteristics of As. The results showed that HM can not only adsorb arsenite [As(III)] but also oxidize As(III) into arsenate [As(V)]. However, once As(III) is adsorbed on the HM, it cannot undergo further oxidation. HMNM (extracted from peat soil) exhibited the highest adsorption capacity of As(III), with a maximum amount of 1.95 mg/kg. The functional groups of HM involved in As complexation were primarily phenolic hydroxyl and carboxyl groups. The adsorption capacity of HM samples for As(III) was consistent with their carboxyl group contents. The oxygen-containing functional groups and environmentally persistent free radicals (EPFRs) on HM can directly oxidize As(Ⅲ) through electron transfer, or indirectly induce the production of reactive oxygen species (ROS), such as hydroxyl radicals, to further oxidize As(Ⅲ). This study provides new insight into the transport and transformation process of As mediated by soil HM, and establishes a theoretical basis for As remediation.
Collapse
Affiliation(s)
- Yunchao Dai
- College of Resource and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China
| | - Sirui Ma
- College of Resource and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Haodong Lu
- College of Resource and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Zixuan Zhang
- College of Resource and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Jun Xu
- College of Resource and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Kecheng Zhu
- College of Resource and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China
| | - Zhiqiang Wang
- College of Resource and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Lingyan Zhu
- College of Resource and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China.
| | - Hanzhong Jia
- College of Resource and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China.
| |
Collapse
|
2
|
Chakraborty P, Manek A, Chakraborty S, Hudson J, Niyogi S. Investigating the combined effects of pH changes and UV radiation exposure on dissolved metal-humate complexes: an important process in aquatic systems. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:58189-58199. [PMID: 36976468 DOI: 10.1007/s11356-023-26178-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 02/24/2023] [Indexed: 05/10/2023]
Abstract
An in vitro study was carried out to examine the impact of UV exposure on metal-dissolved humic material (M-DHM) complexes in aqueous systems at different pH. Complexation reactions of dissolved M (Cu, Ni, and Cd) with DHM increased with the increasing pH of the solution. Kinetically inert M-DHM complexes dominated at higher pH in the test solutions. Exposure to UV radiation did affect the chemical speciation of M-DHM complexes at different pH of the systems. The overall observation suggests that exposure to increasing UV radiation increased the lability, mobility, and bioavailability of M-DHM complexes in aquatic environments. The dissociation rate constant of Cu-DHM was found to be slower than Ni-DHM and Cd-DHM complexes (both before and after UV exposure). At a higher pH range, Cd-DHM complexes dissociated after exposure to UV radiation and a part of this dissociated Cd precipitated out from the system. No change in the lability of the produced Cu-DHM and Ni-DHM complexes after UV radiation exposure was observed. They did not appear to form new kinetically inert complexes even after 12 h of exposure. The outcome of this research has important global implications. The results of this study helped to understand DHM leachability from soil and its effect on dissolved metal concentrations in the Northern Hemisphere water bodies. The results of this study also facilitated to comprehend the fate of M-DHM complexes at photic depths (where pH changes are accompanied by high UV radiation exposure) in tropical marine/freshwater systems during summer.
Collapse
Affiliation(s)
- Parthasarathi Chakraborty
- Marine Trace Metal Biogeochemistry Laboratory, The Centre for Ocean, River, Atmosphere and Land Sciences (CORAL), Indian Institute of Technology, Kharagpur, West Bengal, 721302, India.
| | - Aditya Manek
- Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Sucharita Chakraborty
- Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, West Bengal, 721302, India
| | - Jeff Hudson
- Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Som Niyogi
- Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
- Toxicology Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| |
Collapse
|
3
|
Lenzi M, Franchi E, Leporatti-Persiano M, D'Agostino A, Gennaro P, Marsili L. Assessment of the causes of Hg bioaccumulation in the fish of a Mediterranean lagoon subject to environmental management interventions. MARINE POLLUTION BULLETIN 2021; 162:111907. [PMID: 33338927 DOI: 10.1016/j.marpolbul.2020.111907] [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: 08/11/2020] [Revised: 11/24/2020] [Accepted: 11/30/2020] [Indexed: 06/12/2023]
Abstract
In a Mediterranean lagoon characterized by high levels of Hg in the sediment, Hg content in commercial fish species was determined, and, in order to establish Hg concentration in the water column, Diffusive Gradient in Thin films technique (DGT) was used. The results allowed to state (1) the disturbance of the surface sediment and its resuspension in the water column did not cause detectable increase in Hg releases, (2) the East basin acted more than the West one in contamination of fish species, (3) the small-sized sea-breams (<400 g) were more contaminated than larger sizes ones (>400 g). We concluded: (1) fish contamination may also depend on direct contact with releases of the contaminant and small, gregarious and less sedentary subjects are more likely to incur releases of Hg; (2) Hg releases can be greater in areas with a relatively low sedimentary organic matter load compared to areas subjected to high density macroalgal mat, regardless of the amount of Hg present in the sediments; (3) wind transport of plant masses in low energy storage areas, may constitute an increase factor of Hg in the sediment. A critical review of the results was made in comparison with the available literature reports and some hypotheses were proposed regarding the possible dynamics and availability of the contaminant.
Collapse
Affiliation(s)
- M Lenzi
- Lagoon Ecology and Aquaculture Laboratory (LEALab - WWF Oasi), Strada Provinciale Giannella 154, 58015 Orbetello, Italy.
| | - E Franchi
- Department of Physical Sciences, Earth and Environment, University of Siena, Via Mattioli 4, Siena, Italy
| | | | - A D'Agostino
- Department of Business and Quantitative Studies, University of Naples Parthenope, Italy
| | - P Gennaro
- ISPRA, Italian Institute for Environmental Protection and Research, Leghorn, Italy
| | - L Marsili
- Department of Physical Sciences, Earth and Environment, University of Siena, Via Mattioli 4, Siena, Italy.
| |
Collapse
|
4
|
Klučáková M. Agarose Hydrogels Enriched by Humic Acids as the Complexation Agent. Polymers (Basel) 2020; 12:polym12030687. [PMID: 32204449 PMCID: PMC7182926 DOI: 10.3390/polym12030687] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 03/16/2020] [Accepted: 03/17/2020] [Indexed: 01/27/2023] Open
Abstract
The transport properties of agarose hydrogels enriched by humic acids were studied. Methylene blue, rhodamine 6G and Cu(II) ions were incorporated into hydrogel as diffusion probes, and then their release into water was monitored. Cu(II) ions as well as both the dyes studied in this work have high affinity to humic substances and their interactions strongly affected their diffusion in hydrogels. It was confirmed that humic acids retarded the transport of diffusion probes. Humic acids' enrichment caused the decrease in the values of effective diffusion coefficients due to their complexation with diffusion probes. In general, the diffusion of dyes was more affected by the complexation with humic acids in comparison with Cu(II) ions. The effect of complexation was selective for the particular diffusion probe. The strongest effect was obtained for the diffusion of methylene blue. It was assumed that metal ions interacted preferentially with acidic functional groups. In contrast to Cu(II) ions, dyes can interact with acidic functional groups, and the condensed cyclic structures of the dye probes supported their interactions with the hydrophobic domains of humic substances.
Collapse
Affiliation(s)
- Martina Klučáková
- Faculty of Chemistry, Brno University of Technology, Purkyňova 118/464, 612 00 Brno, Czech Republic
| |
Collapse
|
5
|
Klučáková M, Kalina M, Smilek J, Laštůvková M. The transport of metal ions in hydrogels containing humic acids as active complexation agent. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.02.042] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
6
|
Li H, Wang J, Zhao B, Gao M, Shi W, Zhou H, Xie Z, Zhou B, Lü C, He J. The role of major functional groups: Multi-evidence from the binding experiments of heavy metals on natural fulvic acids extracted from lake sediments. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 162:514-520. [PMID: 30015198 DOI: 10.1016/j.ecoenv.2018.07.038] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 07/08/2018] [Accepted: 07/09/2018] [Indexed: 06/08/2023]
Abstract
Fulvic acid (FA) plays a key role in governing the environmental geochemistry behavior of heavy metals. In this work, the roles of major functional groups were investigated based on binding experiments of heavy metals on natural FA extracted from lake sediments. The results showed that the adsorption capacities were ranked as Cu2+ > Pb2+ >Cd2+. The differences of peak area at 3412, 1713, 617and 2430 cm-1 pre- and post-binding reactions in FTIR spectra suggested that phenolic, carboxyl and nitrogen-containing groups were the major functional groups providing sites binding heavy metals. Moreover, the results of bi-Langmuir model and the ionic strength effects jointly indicated that electrostatic attraction was the key mechanism during the adsorption process. The fitted results of Ligand-binding model suggested that the major functional groups in FA were classified into two types binding sites: weak (i.e. phenolic and carboxyl groups) and strong binding sites (i.e. nitrogen-containing groups). Additionally, there might be p-benzoquinone-like formed in FA which were then reduced to hydroquinone during the adsorption process, corresponding to the changing of peak area at 1614 and 830 cm-1 in FTIR spectra, the occurrence of Peak C in Fluorescence excitation-emission matrix (EEM) spectra and the ratios of H/C (<1) and O/C (≈1). The organic matter in sediments from Lake Wuliangsuhai presented similar characteristics with terrestrial plants due to the lake characterized by Phragmites australis and Potamogeton pectinatus L. being the dominant species, which shared large proportions of woody tissues as well as waxy hydrocarbons resembling that of terrestrial plants. This work is useful to insight the environmental effects of FA on heavy metals in environment.
Collapse
Affiliation(s)
- Hao Li
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China
| | - Jinghua Wang
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China
| | - Boyi Zhao
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China
| | - Manshu Gao
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China
| | - Wenjing Shi
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China
| | - Haijun Zhou
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Environmental Monitoring Center of Inner Mongolia, Hohhot 010011, China
| | - Zhilei Xie
- Environmental Monitoring Center of Inner Mongolia, Hohhot 010011, China
| | - Bin Zhou
- Tianjin Academy of Environmental Sciences, Tianjin 300191, China
| | - Changwei Lü
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China.
| | - Jiang He
- Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China; Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China.
| |
Collapse
|
7
|
Menegário AA, Yabuki LNM, Luko KS, Williams PN, Blackburn DM. Use of diffusive gradient in thin films for in situ measurements: A review on the progress in chemical fractionation, speciation and bioavailability of metals in waters. Anal Chim Acta 2017; 983:54-66. [DOI: 10.1016/j.aca.2017.06.041] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 06/23/2017] [Accepted: 06/24/2017] [Indexed: 11/16/2022]
|
8
|
Mangal V, Zhu Y, Shi YX, Guéguen C. Assessing cadmium and vanadium accumulation using diffusive gradient in thin-films (DGT) and phytoplankton in the Churchill River estuary, Manitoba. CHEMOSPHERE 2016; 163:90-98. [PMID: 27521643 DOI: 10.1016/j.chemosphere.2016.08.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 07/15/2016] [Accepted: 08/01/2016] [Indexed: 06/06/2023]
Abstract
Diffusive gradient in thin films (DGT) and phytoplankton communities were evaluated for the measurement of Cd and V at environmentally relevant concentrations in laboratory settings and in the Churchill River estuary (Manitoba, Canada) during an annual spring melt. Despite rapid changes in hydrology and water quality, DGT samplers and intracellular Cd and V concentrations were positively correlated (0.79 < r(2) < 0.99), suggesting comparable accumulation trends between both DGT-labile and intracellular monitoring techniques. The largest accumulated concentrations of both Cd and V by DGT and phytoplankton accumulation methods were found later into the river discharge period. In controlled settings, accumulated Cd and V concentrations by the diatom Attheya septentrionalis displayed a strong correlation with metals accumulated by DGTs (r(2) > 0.99). Principal component analysis (PCA) reinforced similarities between both metal monitoring techniques and assessed how changing environmental variables during the river discharge period influenced each monitoring technique. Cd accumulation was influenced by DOC concentrations and protein-like DOM whereas ionic strength (i.e. conductivity) and humic-like DOM influenced V accumulation. The present findings suggest that (1) DGT is a versatile tool for monitoring bioaccumulation of Cd and V in highly dynamic environmental systems and (2) DOC concentration, DOM composition, conductivity, pH, and river discharge influence the bioavailability of Cd and V in estuarine and riverine waters.
Collapse
Affiliation(s)
- V Mangal
- Environmental and Life Sciences Graduate Program, Trent University, ON, Canada
| | - Y Zhu
- Environmental and Life Sciences Graduate Program, Trent University, ON, Canada
| | - Y X Shi
- Environmental and Life Sciences Graduate Program, Trent University, ON, Canada
| | - C Guéguen
- Chemistry Department, Trent University, ON, Canada.
| |
Collapse
|
9
|
He E, Lü C, He J, Zhao B, Wang J, Zhang R, Ding T. Binding characteristics of Cu 2+ to natural humic acid fractions sequentially extracted from the lake sediments. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:22667-22677. [PMID: 27557969 DOI: 10.1007/s11356-016-7487-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 08/16/2016] [Indexed: 06/06/2023]
Abstract
Humic acids (HAs) determine the distribution, toxicity, bioavailability, and ultimate fate of heavy metals in the environment. In this work, ten HA fractions (F1-F10) were used as adsorbent, which were sequentially extracted from natural sediments of Lake Wuliangsuhai, to investigate the binding characteristics of Cu2+ to HA. On the basis of the characterization results, differences were found between the ten extracted HA fractions responding to their elemental compositions and acidic functional groups. The characterization results reveal that the responses of ten extracted HA fractions to their elemental compositions and acidic functional groups were different. The O/C and (O + N)/C ratio of F1-F8 approximately ranged from 0.66 to 0.53 and from 0.72 to 0.61, respectively; the measured results showed that the contents of phenolic groups and carboxyl groups decreased from 4.46 to 2.60 mmol/g and 1.60 to 0.58 mmol/g, respectively. The binding characteristics of Cu2+ to the ten HA fractions were well modeled by the bi-Langmuir model; the binding behavior of Cu2+ to all the ten HA fractions were strongly impacted by pH and ionic strength. The FTIR and SEM-EDX image of HA fractions (pre- and post-adsorption) revealed that carboxyl and phenolic groups were responsible for the Cu2+ sorption on the ten sequentially extracted HA fractions process, which is the same with the analysis of the ligand binding and bi-Langmuir models Accordingly, the adsorption capacity of the former HA fractions on Cu2+ were higher than the latter ones, which may be attributed to the difference of carboxyl and phenolic group contents between the former and latter extracted HA fractions. Additionally, the functional groups with N and S should not be neglected. This work is hopeful to understand the environmental effect of humic substances, environmental geochemical behavior, and bioavailability of heavy metals in lakes.
Collapse
Affiliation(s)
- En He
- College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China
- Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China
| | - Changwei Lü
- College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China.
- Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China.
| | - Jiang He
- College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China.
- Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China.
- College of Life Sciences, Inner Mongolia University, Hohhot, 010021, China.
| | - Boyi Zhao
- College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China
- Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China
- College of Life Sciences, Inner Mongolia University, Hohhot, 010021, China
| | - Jinghua Wang
- College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China
- Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China
- College of Life Sciences, Inner Mongolia University, Hohhot, 010021, China
| | - Ruiqing Zhang
- College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China
- Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China
| | - Tao Ding
- College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, China
- Institute of Environmental Geology, Inner Mongolia University, Hohhot, 010021, China
| |
Collapse
|
10
|
Chakraborty P, Chakraborty S, Jayachandran S, Madan R, Sarkar A, Linsy P, Nath BN. Effects of bottom water dissolved oxygen variability on copper and lead fractionation in the sediments across the oxygen minimum zone, western continental margin of India. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 566-567:1052-1061. [PMID: 27267721 DOI: 10.1016/j.scitotenv.2016.05.125] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 05/17/2016] [Accepted: 05/17/2016] [Indexed: 06/06/2023]
Abstract
This study describes the effect of varying bottom-water oxygen concentration on geochemical fractionation (operational speciation) of Cu and Pb in the underneath sediments across the oxygen minimum zone (Arabian Sea) in the west coast of India. Both, Cu and Pb were redistributed among the different binding phases of the sediments with changing dissolved oxygen level (from oxic to hypoxic and close to suboxic) in the bottom water. The average lability of Cu-sediment complexes gradually decreased (i.e., stability increased) with the decreasing dissolved oxygen concentrations of the bottom water. Decreasing bottom-water oxygen concentration increased Cu association with sedimentary organic matter. However, Pb association with Fe/Mn-oxyhydroxide phases in the sediments gradually decreased with the decreasing dissolved oxygen concentration of the overlying bottom water (due to dissolution of Fe/Mn oxyhydroxide phase). The lability of Pb-sediment complexes increased with the decreasing bottom-water oxygen concentration. This study suggests that bottom-water oxygen concentration is one of the key factors governing stability and lability of Cu and Pb complexes in the underneath sediment. Sedimentary organic matter and Fe/Mn oxyhydroxide binding phases were the major hosting phases for Cu and Pb respectively in the study area. Increasing lability of Pb-complexes in bottom sediments may lead to positive benthic fluxes of Pb at low oxygen environment.
Collapse
Affiliation(s)
- Parthasarathi Chakraborty
- Geological Oceanography Division, National Institute of Oceanography (CSIR), Dona Paula 403004, Goa, India.
| | - Sucharita Chakraborty
- Geological Oceanography Division, National Institute of Oceanography (CSIR), Dona Paula 403004, Goa, India
| | - Saranya Jayachandran
- Geological Oceanography Division, National Institute of Oceanography (CSIR), Dona Paula 403004, Goa, India
| | - Ritu Madan
- Geological Oceanography Division, National Institute of Oceanography (CSIR), Dona Paula 403004, Goa, India
| | - Arindam Sarkar
- Geological Oceanography Division, National Institute of Oceanography (CSIR), Dona Paula 403004, Goa, India; Regional Research Station (Red & Laterite Zone), Bidhan Chandra Krishi Viswavidyalaya, Jhargram-721507, Paschim Medinipur, West Bengal, India
| | - P Linsy
- Geological Oceanography Division, National Institute of Oceanography (CSIR), Dona Paula 403004, Goa, India
| | - B Nagender Nath
- Geological Oceanography Division, National Institute of Oceanography (CSIR), Dona Paula 403004, Goa, India
| |
Collapse
|
11
|
Laborda E, Olmos JM, Molina Á. Transfer of complexed and dissociated ionic species at soft interfaces: a voltammetric study of chemical kinetic and diffusional effects. Phys Chem Chem Phys 2016; 18:10158-72. [DOI: 10.1039/c6cp00780e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ACDT mechanism is considered in which two different ionic species of the same charge can be transferred across a soft interface while they interconvert each other through a homogeneous chemical reaction.
Collapse
Affiliation(s)
- Eduardo Laborda
- Departamento de Química Física
- Facultad de Química
- Regional Campus of International Excellence “Campus Mare Nostrum”
- Universidad de Murcia
- 30100 Murcia
| | - José Manuel Olmos
- Departamento de Química Física
- Facultad de Química
- Regional Campus of International Excellence “Campus Mare Nostrum”
- Universidad de Murcia
- 30100 Murcia
| | - Ángela Molina
- Departamento de Química Física
- Facultad de Química
- Regional Campus of International Excellence “Campus Mare Nostrum”
- Universidad de Murcia
- 30100 Murcia
| |
Collapse
|
12
|
Chakraborty P, Ramteke D, Chakraborty S, Chennuri K, Bardhan P. Relationship between the lability of sediment-bound Cd and its bioaccumulation in edible oyster. MARINE POLLUTION BULLETIN 2015; 100:344-351. [PMID: 26359116 DOI: 10.1016/j.marpolbul.2015.08.027] [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: 06/25/2015] [Revised: 08/13/2015] [Accepted: 08/16/2015] [Indexed: 06/05/2023]
Abstract
A linkage between Cd speciation in sediments and its bioaccumulation in edible oyster (Crassostrea sp.) from a tropical estuarine system was established. Bioaccumulation of Cd in edible oyster increased with the increasing lability and dissociation rate constants of Cd-sediment complexes in the bottom sediments. Total Cd concentration in sediment was not a good indicator of Cd-bioavailability. Increasing trace metal competition in sediments increased lability and bioavailability of Cd in the tropical estuarine sediment. Low thermodynamic stability and high bioavailability of Cd in the estuarine sediment were responsible for high bioaccumulation of Cd in edible oysters (3.2-12.2mgkg(-1)) even though the total concentration of Cd in the bottom sediment was low (0.17-0.49mgkg(-1)).
Collapse
Affiliation(s)
- Parthasarathi Chakraborty
- Geological Oceanography Division, CSIR-National Institute of Oceanography, Dona Paula, Goa 403004, India.
| | - Darwin Ramteke
- Geological Oceanography Division, CSIR-National Institute of Oceanography, Dona Paula, Goa 403004, India
| | - Sucharita Chakraborty
- Geological Oceanography Division, CSIR-National Institute of Oceanography, Dona Paula, Goa 403004, India
| | - Kartheek Chennuri
- Geological Oceanography Division, CSIR-National Institute of Oceanography, Dona Paula, Goa 403004, India
| | - Pratirupa Bardhan
- Geological Oceanography Division, CSIR-National Institute of Oceanography, Dona Paula, Goa 403004, India
| |
Collapse
|
13
|
Klučáková M, Kalina M. Diffusivity of Cu(II) ions in humic gels – influence of reactive functional groups of humic acids. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.05.041] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
14
|
Fakour H, Lin TF. Experimental determination and modeling of arsenic complexation with humic and fulvic acids. JOURNAL OF HAZARDOUS MATERIALS 2014; 279:569-578. [PMID: 25108831 DOI: 10.1016/j.jhazmat.2014.07.039] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 07/17/2014] [Accepted: 07/18/2014] [Indexed: 06/03/2023]
Abstract
The complexation of humic acid (HA) and fulvic acid (FA) with arsenic (As) in water was studied. Experimental results indicate that arsenic may form complexes with HA and FA with a higher affinity for arsenate than for arsenite. With the presence of iron oxide based adsorbents, binding of arsenic to HA/FA in water was significantly suppressed, probably due to adsorption of As and HA/FA. A two-site ligand binding model, considering only strong and weak site types of binding affinity, was successfully developed to describe the complexation of arsenic on the two natural organic fractions. The model showed that the numbers of weak sites were more than 10 times those of strong sites on both HA and FA for both arsenic species studied. The numbers of both types of binding sites were found to be proportional to the HA concentrations, while the apparent stability constants, defined for describing binding affinity between arsenic and the sites, are independent of the HA concentrations. To the best of our knowledge, this is the first study to characterize the impact of HA concentrations on the applicability of the ligand binding model, and to extrapolate the model to FA. The obtained results may give insights on the complexation of arsenic in HA/FA laden groundwater and on the selection of more effective adsorption-based treatment methods for natural waters.
Collapse
Affiliation(s)
- Hoda Fakour
- Department of Environmental Engineering and Global Water Quality Research Center, National Cheng Kung University, Tainan City, Taiwan
| | - Tsair-Fuh Lin
- Department of Environmental Engineering and Global Water Quality Research Center, National Cheng Kung University, Tainan City, Taiwan.
| |
Collapse
|