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Hall LA, Woo I, Marvin-DiPasquale M, Takekawa JY, Krabbenhoft DP, Yee D, Grenier L, De La Cruz SEW. Linking Mesoscale Spatial Variation in Methylmercury Production to Bioaccumulation in Tidal Marsh Food Webs. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:19263-19273. [PMID: 37956992 DOI: 10.1021/acs.est.3c04907] [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: 11/21/2023]
Abstract
Differences in sediment biogeochemistry among tidal marsh features with different hydrological and geomorphological characteristics, including marsh interiors, marsh edges, first-order channels, and third-order channels, can result in spatial variation in MeHg production and availability. To better understand the link between MeHg production in sediments and bioaccumulation in primary and secondary consumer invertebrates and fish, we characterized mesoscale spatial variation in sediment biogeochemistry and MeHg concentrations of sediments, water, and consumer tissues among marsh features. Our results indicated that marsh interiors had biogeochemical conditions, including greater concentrations of organic matter and sulfate reduction rates, that resulted in greater MeHg concentrations in sediments and surface water particulates from marsh interiors compared to other features. Tissue MeHg concentrations of consumers also differed among features, with greater concentrations from marsh edges and interiors compared to channels. This spatial mismatch of MeHg concentrations in sediments and water compared to those in consumers may have resulted from differences in behavior and physiology among consumers that influenced the spatial scale over which MeHg was integrated into tissues. Our results highlight the importance of sampling across a suite of marsh features and considering the behavioral and physiological traits of sentinel taxa for contaminant monitoring studies.
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Affiliation(s)
- Laurie A Hall
- U.S. Geological Survey, Western Ecological Research Center, San Francisco Bay Estuary Field Station, NASA Research Park Bldg. 19, N. Akron Road, Moffett Field, California 94035, United States
| | - Isa Woo
- U.S. Geological Survey, Western Ecological Research Center, San Francisco Bay Estuary Field Station, NASA Research Park Bldg. 19, N. Akron Road, Moffett Field, California 94035, United States
| | - Mark Marvin-DiPasquale
- U.S. Geological Survey, Water Mission Area, Earth System Processes Division, 345 Middlefield Road, Menlo Park, California 94025, United States
| | - John Y Takekawa
- U.S. Geological Survey, Western Ecological Research Center, San Francisco Bay Estuary Field Station, NASA Research Park Bldg. 19, N. Akron Road, Moffett Field, California 94035, United States
| | - David P Krabbenhoft
- U.S. Geological Survey, Mercury Research Laboratory, 8505 Research Way, Middleton, Wisconsin 53562, United States
| | - Donald Yee
- San Francisco Estuary Institute, 4911 Central Avenue, Richmond, California 94804, United States
| | - Letitia Grenier
- San Francisco Estuary Institute, 4911 Central Avenue, Richmond, California 94804, United States
| | - Susan E W De La Cruz
- U.S. Geological Survey, Western Ecological Research Center, San Francisco Bay Estuary Field Station, NASA Research Park Bldg. 19, N. Akron Road, Moffett Field, California 94035, United States
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Quiroga-Flores R, Guédron S, Achá D. High methylmercury uptake by green algae in Lake Titicaca: Potential implications for remediation. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 207:111256. [PMID: 32920312 DOI: 10.1016/j.ecoenv.2020.111256] [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: 10/30/2019] [Revised: 04/20/2020] [Accepted: 08/25/2020] [Indexed: 06/11/2023]
Abstract
Anthropogenic pressure in the high altitude lakes such as Titicaca and Uru (Bolivia) may favor the production of methylmercury (MeHg) known to accumulate in trophic chains. Periphyton associated with emerged aquatic plants (totoras) from the lake shores accumulates and demethylates MeHg providing a potential cost-effective water treatment technique. In this laboratory study, we measured the MeHg uptake kinetics of a consortium of green algae isolated from Lake Titicaca totora's periphyton. The most abundant algal consortium, composed of Oedogonium spp., Chlorella spp., Scenedesmus spp., was exposed to rising MeHg concentrations (from 5 to 200 ng·L-1) to assess their maximum potential capacity for MeHg accumulation. Various algal biomass concentrations were tested to choose the optimal one. Results provided a net MeHg uptake rate by this algal consortium of 2.38 amol ng-1·h-1·nM-1 (the total uptake was 2863 ng MeHg·g-1) for an initial concentration of 200 ng MeHg·L-1 with an algal biomass concentration of 0.02 g·L-1. This initial MeHg concentration is 1000 times higher than the one measured in the eutrophic Cohana Bay of Lake Titicaca, which shows the high accumulation potential of these green algae. Our data suggest that periphyton has a high potential for the treatment of Hg contaminated waters in constructing wetlands in the Andean Altiplano.
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Affiliation(s)
- Roxana Quiroga-Flores
- Instituto de Investigaciones Fármaco Bioquímicas, Universidad Mayor de San Andrés, La Paz, Bolivia; Division of Biotechnology, Department of Chemistry, P.O. Box 124, Lund University, SE-223 62, Lund, Sweden.
| | - Stéphane Guédron
- Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, 38000, Grenoble, France
| | - Dario Achá
- Laboratorio de Calidad Ambiental, Instituto de Ecología, Universidad Mayor de San Andrés, Campus Universitario de Cota Cota, Casilla, 3161, La Paz, Bolivia
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Bouchet S, Goñi-Urriza M, Monperrus M, Guyoneaud R, Fernandez P, Heredia C, Tessier E, Gassie C, Point D, Guédron S, Achá D, Amouroux D. Linking Microbial Activities and Low-Molecular-Weight Thiols to Hg Methylation in Biofilms and Periphyton from High-Altitude Tropical Lakes in the Bolivian Altiplano. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:9758-9767. [PMID: 30037219 DOI: 10.1021/acs.est.8b01885] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The sources and factors controlling concentrations of monomethylmercury (MMHg) in aquatic ecosystems need to be better understood. Here, we investigated Hg transformations in sediments, periphyton associated with green algae's or aquatic plants, and benthic biofilms from the Lake Titicaca hydrosystem and compared them to the occurrence of active methylating microorganisms and extracellular Hg ligands. Intense Hg methylation was found in benthic biofilms and green algae's periphyton, while it remained low in sediments and aquatic plants' periphyton. Demethylation varied between compartments but remained overall in the same range. Hg methylation was mainly carried out by sulfate reducers, although methanogens also played a role. Its variability between compartments was first explained by the presence or absence of the hgcAB genes. Next, both benthic biofilm and green algae's periphyton exhibited a great diversity of extracellular low-molecular-weight (LMW) thiols (13 or 14 compounds) present at a range of a few nmol L-1 or μmol L-1 but clearly dominated by cysteine and 3-mercaptopropionic acid. Hg methylation was overall positively correlated to the total thiol concentrations, albeit to different extents according to the compartment and conditions. This work is the first examining the interplay between active methylating bacterial communities and extracellular ligands in heterotrophic biofilms and supports the involvement of LMW thiols in Hg methylation in real aquatic systems.
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Affiliation(s)
- Sylvain Bouchet
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - Marisol Goñi-Urriza
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - Mathilde Monperrus
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - Rémy Guyoneaud
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - Pablo Fernandez
- Unidad de Calidad Ambiental (UCA) , Instituto de Ecologia, Universidad Mayor de San Andres, Campus Universitario de Cota Cota , Calle 27 , 00000 La Paz , Bolivia
| | - Carlos Heredia
- Unidad de Calidad Ambiental (UCA) , Instituto de Ecologia, Universidad Mayor de San Andres, Campus Universitario de Cota Cota , Calle 27 , 00000 La Paz , Bolivia
| | - Emmanuel Tessier
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - Claire Gassie
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
| | - David Point
- Unidad de Calidad Ambiental (UCA) , Instituto de Ecologia, Universidad Mayor de San Andres, Campus Universitario de Cota Cota , Calle 27 , 00000 La Paz , Bolivia
- Géosciences Environnement Toulouse, UMR5563, IRD UR 234 , Université Paul Sabatier , 14 Avenue Edouard Belin , 31400 Toulouse , France
| | - Stéphane Guédron
- Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre , 38000 Grenoble , France
- Laboratorio de Hidroquímica , Instituto de Investigaciones Químicas, Universidad Mayor de San Andrés, Campus Universitario de Cota-Cota , casilla 3161 , 00000 La Paz , Bolivia
| | - Dario Achá
- Unidad de Calidad Ambiental (UCA) , Instituto de Ecologia, Universidad Mayor de San Andres, Campus Universitario de Cota Cota , Calle 27 , 00000 La Paz , Bolivia
| | - David Amouroux
- CNRS/Univ Pau & Pays Adour , Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux , UMR5254, 64000 , Pau , France
- Unidad de Calidad Ambiental (UCA) , Instituto de Ecologia, Universidad Mayor de San Andres, Campus Universitario de Cota Cota , Calle 27 , 00000 La Paz , Bolivia
- Géosciences Environnement Toulouse, UMR5563, IRD UR 234 , Université Paul Sabatier , 14 Avenue Edouard Belin , 31400 Toulouse , France
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Álvarez CR, Jiménez-Moreno M, Bernardo FJG, Martín-Doimeadios RCR, Nevado JJB. Using species-specific enriched stable isotopes to study the effect of fresh mercury inputs in soil-earthworm systems. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 147:192-199. [PMID: 28843190 DOI: 10.1016/j.ecoenv.2017.08.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 07/29/2017] [Accepted: 08/04/2017] [Indexed: 06/07/2023]
Abstract
The fate of mercury (Hg) in the soil-earthworm system is still far from being fully understood, especially regarding recurrent and challenging questions about the importance of the reactivity of exogenous Hg species. Thus, to predict the potential effect of Hg inputs in terrestrial ecosystems, it is necessary to evaluate separately the reactivity of the endogenous and exogenous Hg species and, for this purpose, the use of enriched stable isotope tracers is a promising tool. In the present work, earthworms (Lumbricus terrestris) were exposed to historically Hg contaminated soils from the Almadén mining district, Spain. The soils were either non-spiked, which contain only endogenous or native Hg naturally occurring in the soil, or spiked with isotopically enriched inorganic Hg (199IHg), representing exogenous or spiked Hg apart from the native one. The differential reactivity of endogenous and exogenous Hg in the soil conditioned the processes of methylation, mobilization, and assimilation of inorganic Hg by earthworms. Both endogenous and exogenous Hg species also behave distinctly regarding their bioaccumulation in earthworms, as suggested by the bioaccumulation factors, being the endogenous methylmercury (MeHg) the species more readily bioaccumulated by earthworms and in a higher extent. To the best of our knowledge, this work demonstrates for the first time the potential of enriched stable isotopes to study the effects of fresh Hg inputs in soil-earthworm systems. The findings of this work can be taken as a case study on the dynamics of Hg species in complex terrestrial systems and open a new door for future experiments.
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Affiliation(s)
- C Rodríguez Álvarez
- Department of Analytical Chemistry and Food Technology, Faculty of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, E-45071 Toledo, Spain
| | - M Jiménez-Moreno
- Department of Analytical Chemistry and Food Technology, Faculty of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, E-45071 Toledo, Spain
| | - F J Guzmán Bernardo
- Department of Analytical Chemistry and Food Technology, Faculty of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, E-45071 Toledo, Spain
| | - R C Rodríguez Martín-Doimeadios
- Department of Analytical Chemistry and Food Technology, Faculty of Environmental Sciences and Biochemistry, University of Castilla-La Mancha, E-45071 Toledo, Spain.
| | - J J Berzas Nevado
- Department of Analytical Chemistry and Food Technology, Faculty of Chemistry, University of Castilla-La Mancha, E-16071 Ciudad Real, Spain
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Creswell JE, Shafer MM, Babiarz CL, Tan SZ, Musinsky AL, Schott TH, Roden EE, Armstrong DE. Biogeochemical controls on mercury methylation in the Allequash Creek wetland. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:15325-15339. [PMID: 28502050 DOI: 10.1007/s11356-017-9094-2] [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: 10/11/2016] [Accepted: 04/24/2017] [Indexed: 06/07/2023]
Abstract
We measured mercury methylation potentials and a suite of related biogeochemical parameters in sediment cores and porewater from two geochemically distinct sites in the Allequash Creek wetland, northern Wisconsin, USA. We found a high degree of spatial variability in the methylation rate potentials but no significant differences between the two sites. We identified the primary geochemical factors controlling net methylmercury production at this site to be acid-volatile sulfide, dissolved organic carbon, total dissolved iron, and porewater iron(II). Season and demethylation rates also appear to regulate net methylmercury production. Our equilibrium speciation modeling demonstrated that sulfide likely regulated methylation rates by controlling the speciation of inorganic mercury and therefore its bioavailability to methylating bacteria. We found that no individual geochemical parameter could explain a significant amount of the observed variability in mercury methylation rates, but we found significant multivariate relationships, supporting the widely held understanding that net methylmercury production is balance of several simultaneously occurring processes.
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Affiliation(s)
- Joel E Creswell
- Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 N. Park St, Madison, WI, 53706, USA.
- U.S. House of Representatives, 2346 Rayburn House Office Building, Washington DC, 20515, USA.
| | - Martin M Shafer
- Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 N. Park St, Madison, WI, 53706, USA
- Wisconsin State Laboratory of Hygiene, 2601 Agriculture Dr, Madison, WI, 53718, USA
| | - Christopher L Babiarz
- Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 N. Park St, Madison, WI, 53706, USA
- Wisconsin Water Science Center,U.S. Geological Survey, 8505 Research Way, Middleton, WI, 53562, USA
| | - Sue-Zanne Tan
- Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 N. Park St, Madison, WI, 53706, USA
| | - Abbey L Musinsky
- Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 N. Park St, Madison, WI, 53706, USA
| | - Trevor H Schott
- Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 N. Park St, Madison, WI, 53706, USA
| | - Eric E Roden
- Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 N. Park St, Madison, WI, 53706, USA
- Department of Geoscience, University of Wisconsin - Madison, 1215 W. Dayton St, Madison, WI, 53706, USA
| | - David E Armstrong
- Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 N. Park St, Madison, WI, 53706, USA
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Bareket MM, Bookman R, Katsman R, de Stigter H, Herut B. The role of transport processes of particulate mercury in modifying marine anthropogenic secondary sources, the case of Haifa bay, Israel. MARINE POLLUTION BULLETIN 2016; 105:286-291. [PMID: 26892200 DOI: 10.1016/j.marpolbul.2016.02.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2015] [Revised: 01/29/2016] [Accepted: 02/04/2016] [Indexed: 06/05/2023]
Abstract
We have assessed the redistribution of a secondary source of sedimentary anthropogenic mercury in the Haifa bay (HB) area (SE Levantine basin), which is the northern sink for Nile-driven sand. A long-term (30years) ~80% decrease of the total sedimentary mercury concentrations (THg) was recorded in the inner bay, while an up to 3-fold increase was recorded in the top sediments of the outer bay. Sedimentary THg depth profiles and their temporal variability were used to model the main re-distribution processes, mainly resuspension associated with winter storm-derived transport. This mechanism transforms a secondary, sandy and well-aerated sink into a tertiary, more silty and hypoxic source at adjacent peripheral areas, affecting mercury bioavailability. We revisited the concept of environmental relaxation, i.e. the rate of return of a polluted environment to an acceptable state, showing that sedimentary transport processes may affect the associated ecological risks, mainly at shallow-water coastal sites.
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Affiliation(s)
- Merav M Bareket
- Dr. Moses Strauss Department of Marine Geosciences, Leon H.Charney School of Marine Sciences, University of Haifa, Haifa 31905, Israel; Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa 31080, Israel
| | - Revital Bookman
- Dr. Moses Strauss Department of Marine Geosciences, Leon H.Charney School of Marine Sciences, University of Haifa, Haifa 31905, Israel.
| | - Regina Katsman
- Dr. Moses Strauss Department of Marine Geosciences, Leon H.Charney School of Marine Sciences, University of Haifa, Haifa 31905, Israel
| | - Henko de Stigter
- Royal Netherlands Institute for Sea Research (NIOZ), NL-1790 AB, Den Burg, Texel, Netherlands
| | - Barak Herut
- Dr. Moses Strauss Department of Marine Geosciences, Leon H.Charney School of Marine Sciences, University of Haifa, Haifa 31905, Israel; Israel Oceanographic and Limnological Research, National Institute of Oceanography, Haifa 31080, Israel.
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Conder JM, Fuchsman PC, Grover MM, Magar VS, Henning MH. Critical review of mercury sediment quality values for the protection of benthic invertebrates. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2015; 34:6-21. [PMID: 25319944 DOI: 10.1002/etc.2769] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 03/29/2014] [Accepted: 10/01/2014] [Indexed: 06/04/2023]
Abstract
Sediment quality values (SQV) are commonly used-and misused-to characterize the need for investigation, understand causes of observed effects, and derive management strategies to protect benthic invertebrates from direct toxic effects. The authors compiled more than 40 SQVs for mercury, nearly all of which are "co-occurrence" SQVs derived from databases of paired chemistry and benthic invertebrate effects data obtained from field-collected sediment. Co-occurrence SQVs are not derived in a manner that reflects cause-effect, concentration-response relationships for individual chemicals such as mercury, because multiple potential stressors often co-occur in the data sets used to derive SQVs. The authors assembled alternative data to characterize mercury-specific effect thresholds, including results of 7 laboratory studies with mercury-spiked sediments and 23 studies at mercury-contaminated sites (e.g., chloralkali facilities, mercury mines). The median (± interquartile range) co-occurrence SQVs associated with a lack of effects (0.16 mg/kg [0.13-0.20 mg/kg]) or a potential for effects (0.88 mg/kg [0.50-1.4 mg/kg]) were orders of magnitude lower than no-observed-effect concentrations reported in mercury-spiked toxicity studies (3.3 mg/kg [1.1-9.4 mg/kg]) and mercury site investigations (22 mg/kg [3.8-66 mg/kg]). Additionally, there was a high degree of overlap between co-occurrence SQVs and background mercury levels. Although SQVs are appropriate only for initial screening, they are commonly misused for characterizing or managing risks at mercury-contaminated sites. Spiked sediment and site data provide more appropriate and useful alternative information for characterization and management purposes. Further research is recommended to refine mercury effect thresholds for sediment that address the bioavailability and causal effects of mercury exposure. Environ Toxicol Chem 2015;34:6-21. © 2014 SETAC.
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Emili A, Carrasco L, Acquavita A, Covelli S. A laboratory-incubated redox oscillation experiment to investigate Hg fluxes from highly contaminated coastal marine sediments (Gulf of Trieste, Northern Adriatic Sea). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2014; 21:4124-33. [PMID: 24122269 DOI: 10.1007/s11356-013-2225-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Accepted: 10/07/2013] [Indexed: 05/17/2023]
Abstract
Mercury (Hg) mobility at the sediment-water interface was investigated during a laboratory incubation experiment conducted with highly contaminated sediments (13 μg g(-1)) of the Gulf of Trieste. Undisturbed sediment was collected in front of the Isonzo River mouth, which inflows Hg-rich suspended material originating from the Idrija (NW Slovenia) mining district. Since hypoxic and anoxic conditions at the bottom are frequently observed and can influence the Hg biogeochemical behavior, a redox oscillation was simulated in the laboratory, at in situ temperature, using a dark flux chamber. Temporal variations of several parameters were monitored simultaneously: dissolved Hg (DHg) and methylmercury (MeHg), O2, NH4 (+), NO3 (-) + NO2 (-), PO4 (3-), H2S, dissolved Mn(2+), dissolved inorganic and organic carbon (DIC and DOC). Under anoxic conditions, both Hg (665 ng m(2) day(-1)) and MeHg (550 ng m(2) day(-1)) fluxed from sediments into the water column, whereas re-oxygenation caused concentrations of MeHg and Hg to rapidly drop, probably due to re-adsorption onto Fe/Mn-oxyhydroxides and enhanced demethylation processes. Hence, during anoxic events, sediments of the Gulf of Trieste may be considered as an important source of DHg species for the water column. On the contrary, re-oxygenation of the bottom compartment mitigates Hg and MeHg release from the sediment, thus acting as a natural "defence" from possible interaction between the metal and the aquatic organisms.
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Affiliation(s)
- A Emili
- Department of Mathematics and Geoscience, University of Trieste, Via Weiss 2, 34128, Trieste, Italy,
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Suzuki K, Machado E, Machado W, Bellido A, Bellido L, Osso J, Lopes R. Kinetics of trace metal removal from tidal water by mangrove sediments under different redox conditions. Radiat Phys Chem Oxf Engl 1993 2014. [DOI: 10.1016/j.radphyschem.2013.02.027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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10
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Removal efficiency of 75Se, 51Cr and 60Co from tidal water by mangrove sediments from Sepetiba Bay (SE Brazil). J Radioanal Nucl Chem 2013. [DOI: 10.1007/s10967-013-2760-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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11
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Rodriguez-Gonzalez P, Bouchet S, Monperrus M, Tessier E, Amouroux D. In situ experiments for element species-specific environmental reactivity of tin and mercury compounds using isotopic tracers and multiple linear regression. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:1269-1280. [PMID: 22678549 DOI: 10.1007/s11356-012-1019-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Accepted: 05/28/2012] [Indexed: 06/01/2023]
Abstract
The fate of mercury (Hg) and tin (Sn) compounds in ecosystems is strongly determined by their alkylation/dealkylation pathways. However, the experimental determination of those transformations is still not straightforward and methodologies need to be refined. The purpose of this work is the development of a comprehensive and adaptable tool for an accurate experimental assessment of specific formation/degradation yields and half-lives of elemental species in different aquatic environments. The methodology combines field incubations of coastal waters and surface sediments with the addition of species-specific isotopically enriched tracers and a mathematical approach based on the deconvolution of isotopic patterns. The method has been applied to the study of the environmental reactivity of Hg and Sn compounds in coastal water and surface sediment samples collected in two different coastal ecosystems of the South French Atlantic Coast (Arcachon Bay and Adour Estuary). Both the level of isotopically enriched species and the spiking solution composition were found to alter dibutyltin and monomethylmercury degradation yields, while no significant changes were measurable for tributyltin and Hg(II). For butyltin species, the presence of light was found to be the main source of degradation and removal of these contaminants from surface coastal environments. In contrast, photomediated processes do not significantly influence either the methylation of mercury or the demethylation of methylmercury. The proposed method constitutes an advancement from the previous element-specific isotopic tracers' approaches, which allows for instance to discriminate the extent of net and oxidative Hg demethylation and to identify which debutylation step is controlling the environmental persistence of butyltin compounds.
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Affiliation(s)
- Pablo Rodriguez-Gonzalez
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux, UMR 5254 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc, 64053, Pau, France.
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12
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Bouchet S, Rodriguez-Gonzalez P, Bridou R, Monperrus M, Tessier E, Anschutz P, Guyoneaud R, Amouroux D. Investigations into the differential reactivity of endogenous and exogenous mercury species in coastal sediments. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:1292-1301. [PMID: 22821341 DOI: 10.1007/s11356-012-1068-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Accepted: 07/04/2012] [Indexed: 06/01/2023]
Abstract
Stable isotopic tracer methodologies now allow the evaluation of the reactivity of the endogenous (ambient) and exogenous (added) Hg to further predict the potential effect of Hg inputs in ecosystems. The differential reactivity of endogenous and exogenous Hg was compared in superficial sediments collected in a coastal lagoon (Arcachon Bay) and in an estuary (Adour River) from the Bay of Biscay (SW France). All Hg species (gaseous, aqueous, and solid fraction) and ancillary data were measured during time course slurry experiments under variable redox conditions. The average endogenous methylation yield was higher in the estuarine (1.2 %) than in the lagoonal sediment (0.5 %), although both methylation and demethylation rates were higher in the lagoonal sediment in relation with a higher sulfate-reducing activity. Demethylation was overall more consistent than methylation in both sediments. The endogenous and exogenous Hg behaviors were always correlated but the exogenous inorganic Hg (IHg) partitioning into water was 2.0-4.3 times higher than the endogenous one. Its methylation was just slightly higher (1.4) in the estuarine sediment while the difference in the lagoonal sediment was much larger (3.6). The relative endogenous and exogenous methylation yields were not correlated to IHg partitioning, demonstrating that the bioavailable species distributions were different for the two IHg pools. In both sediments, the exogenous IHg partitioning equaled the endogenous one within a week, while its higher methylation lasted for months. Such results provide an original assessment approach to compare coastal sediment response to Hg inputs.
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Affiliation(s)
- S Bouchet
- Laboratoire de Chimie Analytique Bio-inorganique et Environnement, Institut Pluridisciplinaire de Recherche sur l'Environnement et les Matériaux, UMR 5254 CNRS-Université de Pau et des Pays de l'Adour, Hélioparc Pau Pyrénées, 2, av. P. Angot, 64053, Pau cedex 9, France
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Suzuki KN, Machado EC, Machado W, Bellido LF, Bellido AVB, Lopes RT. Radiotracer estimates of benthic activity effects on trace metal diffusion into mangrove sediments. MARINE ENVIRONMENTAL RESEARCH 2013; 83:96-100. [PMID: 23174087 DOI: 10.1016/j.marenvres.2012.10.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Revised: 10/14/2012] [Accepted: 10/21/2012] [Indexed: 06/01/2023]
Abstract
Potential influences of the whole benthic organisms' activity (i.e., coupled faunal and microbial effects) on (58)Co, (51)Cr and (65)Zn diffusion into surface mangrove sediment layers (0-6 cm depth) were evaluated in 36 h experiments. Benthic activity indices (BAI) were proposed, calculated as the relative percent difference between untreated sediments and formaldehyde-treated sediments data in relation to untreated sediments data. Benthic activity was estimated as responsible for 32%-44% of total inventories within sediments, being the chromate anion spiked the less affected radiotracer, while (65)Zn was the most sensitive. Benthic activity was quantitatively evidenced as a control on trace metal diffusion into the sediments, contributing to determine the sediment role as a metal sink. This influence can also affect metal potential bioavailability, considering that recently diffused metals can be more readily available to biological uptake.
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Affiliation(s)
- K N Suzuki
- Laboratório de Instrumentação Nuclear, COPPE, Universidade Federal do Rio de Janeiro, RJ, Brazil.
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