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Pregled bibliografske jedinice broj: 675535

A Michaelis-Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments


Cossa, Daniel; Garnier, Cederic; Buscail, Roselyne; Elbaz-Poulichet, Francoise; Mikac, Nevenka; Patel-Sorrentino, Nathalie; Tessier, Erwan; Rigaud, Sylvain; Lenoble, Véronique; Gobeil, Charles
A Michaelis-Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments // Biogeochemistry, 119 (2014), 1/3; 35-43 doi:10.1007/s10533-013-9924-3 (međunarodna recenzija, kratko priopcenje, znanstveni)


CROSBI ID: 675535 Za ispravke kontaktirajte CROSBI podršku putem web obrasca

Naslov
A Michaelis-Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments

Autori
Cossa, Daniel ; Garnier, Cederic ; Buscail, Roselyne ; Elbaz-Poulichet, Francoise ; Mikac, Nevenka ; Patel-Sorrentino, Nathalie ; Tessier, Erwan ; Rigaud, Sylvain ; Lenoble, Véronique ; Gobeil, Charles

Izvornik
Biogeochemistry (0168-2563) 119 (2014), 1/3; 35-43

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, kratko priopcenje, znanstveni

Ključne riječi
mercury; methylmercury; aquatic sediment; methylation; demethylation

Sažetak
Methylation of mercury (Hg) is the crucial process that controls Hg biomagnification along the aquatic food chains. Aquatic sediments are of particular interest because they constitute an essential reservoir where inorganic divalent Hg (HgII) is methylated. Methylmercury (MeHg) concentrations in sediments mainly result from the balance between methylation and demethylation reactions, two opposite natural processes primarily mediated by aquatic microorganisms. Thus, Hg availability and the activity of methylating microbial communities control the MeHg abundance in sediments. Consistently, some studies have reported a significant positive correlation between MeHg and HgII or total Hg (HgT), taken as a proxy for HgII, in aquatic sediments using enzyme-catalyzed methylation/demethylation mechanisms. By compiling 1442 published and unpublished HgT-MeHg couples from lacustrine, riverine, estuarine and marine sediments covering various environmental conditions, from deep pristine abyssal to heavily contaminated riverine sediments, we show that a Michaelis-Menten type relationship is an appropriate model to relate the two parameters: MeHg = aHgT / (Km + HgT), with a = 0.277 ± 0.011 and Km = 188 ± 15 (R2 = 0.70, p < 0.001). From Km variations, which depend on the various encountered environmental conditions, it appears that MeHg formation and accumulation are favoured in marine sediments compared to freshwater ones, and under oxic/suboxic conditions compared to anoxic ones, with redox potential and organic matter lability being the governing factors.

Izvorni jezik
Engleski

Znanstvena područja
Geologija



POVEZANOST RADA


Projekti:
098-0982934-2715 - Biogeokemija metala u sedimentacijskim sustavima i tlima Hrvatske (Kniewald, Goran, MZOS ) ( POIROT)

Ustanove:
Institut "Ruđer Bošković", Zagreb

Profili:

Avatar Url Nevenka Mikac (autor)

Poveznice na cjeloviti tekst rada:

Pristup cjelovitom tekstu rada doi link.springer.com

Citiraj ovu publikaciju:

Cossa, Daniel; Garnier, Cederic; Buscail, Roselyne; Elbaz-Poulichet, Francoise; Mikac, Nevenka; Patel-Sorrentino, Nathalie; Tessier, Erwan; Rigaud, Sylvain; Lenoble, Véronique; Gobeil, Charles
A Michaelis-Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments // Biogeochemistry, 119 (2014), 1/3; 35-43 doi:10.1007/s10533-013-9924-3 (međunarodna recenzija, kratko priopcenje, znanstveni)
Cossa, D., Garnier, C., Buscail, R., Elbaz-Poulichet, F., Mikac, N., Patel-Sorrentino, N., Tessier, E., Rigaud, S., Lenoble, V. & Gobeil, C. (2014) A Michaelis-Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments. Biogeochemistry, 119 (1/3), 35-43 doi:10.1007/s10533-013-9924-3.
@article{article, author = {Cossa, Daniel and Garnier, Cederic and Buscail, Roselyne and Elbaz-Poulichet, Francoise and Mikac, Nevenka and Patel-Sorrentino, Nathalie and Tessier, Erwan and Rigaud, Sylvain and Lenoble, V\'{e}ronique and Gobeil, Charles}, year = {2014}, pages = {35-43}, DOI = {10.1007/s10533-013-9924-3}, keywords = {mercury, methylmercury, aquatic sediment, methylation, demethylation}, journal = {Biogeochemistry}, doi = {10.1007/s10533-013-9924-3}, volume = {119}, number = {1/3}, issn = {0168-2563}, title = {A Michaelis-Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments}, keyword = {mercury, methylmercury, aquatic sediment, methylation, demethylation} }
@article{article, author = {Cossa, Daniel and Garnier, Cederic and Buscail, Roselyne and Elbaz-Poulichet, Francoise and Mikac, Nevenka and Patel-Sorrentino, Nathalie and Tessier, Erwan and Rigaud, Sylvain and Lenoble, V\'{e}ronique and Gobeil, Charles}, year = {2014}, pages = {35-43}, DOI = {10.1007/s10533-013-9924-3}, keywords = {mercury, methylmercury, aquatic sediment, methylation, demethylation}, journal = {Biogeochemistry}, doi = {10.1007/s10533-013-9924-3}, volume = {119}, number = {1/3}, issn = {0168-2563}, title = {A Michaelis-Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments}, keyword = {mercury, methylmercury, aquatic sediment, methylation, demethylation} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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