FN Archimer Export Format
PT J
TI A Michaelis–Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments
BT 
AF COSSA, Daniel
   GARNIER, Cedric
   BUSCAIL, Roselyne
   ELBAZ-POULICHET, Francoise
   MIKAC, Nevenka
   PATEL-SORRENTINO, Nathalie
   TESSIER, Erwan
   RIGAUD, Sylvain
   LENOBLE, Veronique
   GOBEIL, Charles
AS 1:1;2:2;3:3;4:4,5;5:6;6:2;7:2;8:7;9:2;10:8;
FF 1:PDG-RBE-BE-LBCM;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 IFREMER, F-83507 La Seyne Sur Mer, France.
   Univ Toulon & Var, PROTEE, EA 3819, F-83957 La Garde, France.
   Univ Perpignan, CEFREM CNRS UMR 5110, F-66860 Perpignan, France.
   Univ Montpellier I, Lab Hydrosci, UMR CNRS, CC MSE, F-34095 Montpellier 5, France.
   Univ Montpellier 2, Lab Hydrosci, UMR CNRS, CC MSE, F-34095 Montpellier 5, France.
   Rudjer Boskovic Inst, Ctr Marine & Environm Res, Zagreb 10000, Croatia.
   Aix Marseille Univ, Cerege, F-13545 Aix En Provence 04, France.
   Univ Quebec, INRS ETE, Quebec City, PQ G1K 9A9, Canada.
C2 IFREMER, FRANCE
   UNIV TOULON, FRANCE
   UNIV PERPIGNAN, FRANCE
   UNIV MONTPELLIER, FRANCE
   UNIV MONTPELLIER, FRANCE
   RUDJER BOSKOVIC INST, CROATIA
   UNIV AIX MARSEILLE, FRANCE
   UNIV QUEBEC, CANADA
SI TOULON
   AUTRE
SE PDG-RBE-BE-LBCM
   AUTRE
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 3.488
TC 27
UR https://archimer.ifremer.fr/doc/00171/28220/26520.pdf
LA English
DT Article
DE ;Mercury;Methylmercury;Aquatic sediment;Methylation;Demethylation
AB 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 By compiling 1,442 published and unpublished HgT–MeHg couples from lacustrine, riverine, estuarine and marine sediments covering various environmental conditions, from deep pristine abyssal to heavily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/(K m + HgT), with a = 0.277 ± 0.011 and K m = 188 ± 15 (R 2 = 0.70, p < 0.001). From K m 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.
PY 2014
PD JUL
SO Biogeochemistry
SN 0168-2563
PU Springer
VL 119
IS 1-3
UT 000336028400003
BP 35
EP 43
DI 10.1007/s10533-013-9924-3
ID 28220
ER

EF