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Measurements of gaseous mercury exchanges at the sediment-water, water-atmosphere and sediment-atmosphere interfaces of a tidal environment (Arcachon Bay, France).
J Environ Monit. 2011 May; 13(5):1351-9.JE

Abstract

The elemental mercury evasion from non-impacted natural areas is of significant importance in the global Hg cycle due to their large spatial coverage. Intertidal areas represent a dynamic environment promoting the transformations of Hg species and their subsequent redistribution. A major challenge remains in providing reliable data on Hg species variability and fluxes under typical transient tidal conditions found in such environment. Field experiments were thus carried out to allow the assessment and comparison of the magnitude of the gaseous Hg fluxes at the three interfaces, sediment-water, sediment-atmosphere and water-atmosphere of a mesotidal temperate lagoon (Arcachon Bay, Aquitaine, France) over three distinct seasonal conditions. The fluxes between the sediment-water and the sediment-atmosphere interfaces were directly evaluated with field flux chambers, respectively static or dynamic. Water-atmosphere fluxes were evaluated from ambient concentrations using a gas exchange model. The fluxes at the sediment-water interface ranged from -5.0 to 5.1 ng m(-2) h(-1) and appeared mainly controlled by diffusion. The occurrence of macrophytic covers (i.e.Zostera noltii sp.) enhanced the fluxes under light radiations. The first direct measurements of sediment-atmosphere fluxes are reported here. The exchanges were more intense and variable than the two other interfaces, ranging between -78 and 40 ng m(-2) h(-1) and were mostly driven by the overlying atmospheric Hg concentrations and superficial sediment temperature. The exchanges between the water column and the atmosphere, computed as a function of wind speed and gaseous mercury saturation ranged from 0.4 to 14.5 ng m(-2) h(-1). The flux intensities recorded over the intertidal sediments periodically exposed to the atmosphere were roughly 2 to 3 times higher than the fluxes of the other interfaces. The evasion of elemental mercury from emerged intertidal sediments is probably a significant pathway for Hg evasion in such tidal environments exhibiting background contamination level.

Authors+Show Affiliations

IPREM-LCABIE, UMR 5254 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc 2, av P Angot, 64053 Pau Cedex 9, France.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21380428

Citation

Bouchet, Sylvain, et al. "Measurements of Gaseous Mercury Exchanges at the Sediment-water, Water-atmosphere and Sediment-atmosphere Interfaces of a Tidal Environment (Arcachon Bay, France)." Journal of Environmental Monitoring : JEM, vol. 13, no. 5, 2011, pp. 1351-9.
Bouchet S, Tessier E, Monperrus M, et al. Measurements of gaseous mercury exchanges at the sediment-water, water-atmosphere and sediment-atmosphere interfaces of a tidal environment (Arcachon Bay, France). J Environ Monit. 2011;13(5):1351-9.
Bouchet, S., Tessier, E., Monperrus, M., Bridou, R., Clavier, J., Thouzeau, G., & Amouroux, D. (2011). Measurements of gaseous mercury exchanges at the sediment-water, water-atmosphere and sediment-atmosphere interfaces of a tidal environment (Arcachon Bay, France). Journal of Environmental Monitoring : JEM, 13(5), 1351-9. https://doi.org/10.1039/c0em00358a
Bouchet S, et al. Measurements of Gaseous Mercury Exchanges at the Sediment-water, Water-atmosphere and Sediment-atmosphere Interfaces of a Tidal Environment (Arcachon Bay, France). J Environ Monit. 2011;13(5):1351-9. PubMed PMID: 21380428.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Measurements of gaseous mercury exchanges at the sediment-water, water-atmosphere and sediment-atmosphere interfaces of a tidal environment (Arcachon Bay, France). AU - Bouchet,Sylvain, AU - Tessier,Emmanuel, AU - Monperrus,Mathilde, AU - Bridou,Romain, AU - Clavier,Jacques, AU - Thouzeau,Gerard, AU - Amouroux,David, Y1 - 2011/03/07/ PY - 2011/3/8/entrez PY - 2011/3/8/pubmed PY - 2011/8/9/medline SP - 1351 EP - 9 JF - Journal of environmental monitoring : JEM JO - J Environ Monit VL - 13 IS - 5 N2 - The elemental mercury evasion from non-impacted natural areas is of significant importance in the global Hg cycle due to their large spatial coverage. Intertidal areas represent a dynamic environment promoting the transformations of Hg species and their subsequent redistribution. A major challenge remains in providing reliable data on Hg species variability and fluxes under typical transient tidal conditions found in such environment. Field experiments were thus carried out to allow the assessment and comparison of the magnitude of the gaseous Hg fluxes at the three interfaces, sediment-water, sediment-atmosphere and water-atmosphere of a mesotidal temperate lagoon (Arcachon Bay, Aquitaine, France) over three distinct seasonal conditions. The fluxes between the sediment-water and the sediment-atmosphere interfaces were directly evaluated with field flux chambers, respectively static or dynamic. Water-atmosphere fluxes were evaluated from ambient concentrations using a gas exchange model. The fluxes at the sediment-water interface ranged from -5.0 to 5.1 ng m(-2) h(-1) and appeared mainly controlled by diffusion. The occurrence of macrophytic covers (i.e.Zostera noltii sp.) enhanced the fluxes under light radiations. The first direct measurements of sediment-atmosphere fluxes are reported here. The exchanges were more intense and variable than the two other interfaces, ranging between -78 and 40 ng m(-2) h(-1) and were mostly driven by the overlying atmospheric Hg concentrations and superficial sediment temperature. The exchanges between the water column and the atmosphere, computed as a function of wind speed and gaseous mercury saturation ranged from 0.4 to 14.5 ng m(-2) h(-1). The flux intensities recorded over the intertidal sediments periodically exposed to the atmosphere were roughly 2 to 3 times higher than the fluxes of the other interfaces. The evasion of elemental mercury from emerged intertidal sediments is probably a significant pathway for Hg evasion in such tidal environments exhibiting background contamination level. SN - 1464-0333 UR - https://www.unboundmedicine.com/medline/citation/21380428/Measurements_of_gaseous_mercury_exchanges_at_the_sediment_water_water_atmosphere_and_sediment_atmosphere_interfaces_of_a_tidal_environment__Arcachon_Bay_France__ L2 - https://doi.org/10.1039/c0em00358a DB - PRIME DP - Unbound Medicine ER -