Investigations into the differential reactivity of endogenous and exogenous mercury species in coastal sediments

Autor: Romain Bridou, Pierre Anschutz, Rémy Guyoneaud, David Amouroux, Pablo Rodríguez-González, Mathilde Monperrus, Sylvain Bouchet, Emmanuel Tessier
Přispěvatelé: Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM), Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Environnements et Paléoenvironnements OCéaniques (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2012
Předmět:
Geologic Sediments
Time Factors
010504 meteorology & atmospheric sciences
Speciation
Health
Toxicology and Mutagenesis
chemistry.chemical_element
010501 environmental sciences
Methylation
01 natural sciences
chemistry.chemical_compound
[CHIM.ANAL]Chemical Sciences/Analytical chemistry
[CHIM]Chemical Sciences
Environmental Chemistry
Ecotoxicology
14. Life underwater
Methylmercury
Stable isotopes
0105 earth and related environmental sciences
Demethylation
geography
Mercury loading
geography.geographical_feature_category
Mercury Compounds
Stable isotope ratio
Chemistry
Spectrophotometry
Atomic
demethylation
Sediment
methylmercury
Estuary
[CHIM.MATE]Chemical Sciences/Material chemistry
General Medicine
Pollution
Mercury (element)
Mercury Isotopes
Biodegradation
Environmental
13. Climate action
Environmental chemistry
France
Estuaries
Oxidation-Reduction
Bay
Water Pollutants
Chemical
Zdroj: Environmental Science and Pollution Research
Environmental Science and Pollution Research, Springer Verlag, 2013, 20 (3), pp.1292--1301. ⟨10.1007/s11356-012-1068-9⟩
ISSN: 1614-7499
0944-1344
DOI: 10.1007/s11356-012-1068-9
Popis: International audience; 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.
Databáze: OpenAIRE
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