FN Archimer Export Format
PT J
TI In situ adsorption of mercury, methylmercury and other elements by iron oxyhydroxides and organic matter in lake sediments
BT 
AF FEYTE, Stephane
   TESSIER, Andre
   GOBEIL, Charles
   COSSA, Daniel
AS 1:1;2:1;3:1;4:2;
FF 1:;2:;3:;4:PDG-DOP-DCN-BE-LBCM;
C1 Univ Quebec, INRS ETE, Quebec City, PQ G1K 9A9, Canada.
   Ctr Mediterranee, IFREMER, F-83507 La Seyne Sur Mer, France.
C2 UNIV QUEBEC, CANADA
   IFREMER, FRANCE
SI TOULON
SE PDG-DOP-DCN-BE-LBCM
IN WOS Ifremer jusqu'en 2018
   copubli-int-hors-europe
IF 2.017
TC 56
UR https://archimer.ifremer.fr/doc/00007/11839/8607.pdf
LA English
DT Article
AB Samples of authigenic material, sediment overlying water and oxic surface sediment (0-0.5-cm depth) from a perennially oxygenated lacustrine basin were analysed to investigate which solid phases are important for binding a suite of trace elements (Ag, As, Ca, Cd, Cu, Hg, In, methylmercury (MeHg), Mg, Mo, Pb, Sb and Zn). The authigenic material, which was collected with inert Teflon sheets deployed for several years across the sediment water interface, contained mainly poorly crystallized Fe oxyhydroxides and natural organic matter, presumably humic substances derived from the watershed. Manganese oxyhydroxides were not present in the collected authigenic material due to the slightly acidic condition (pH = 5.6) of the lake that prevents the formation and recycling of these compounds. Conditional equilibrium constants for the adsorption of cationic (KFe-M) and anionic (KFe-A) trace elements onto the authigenic Fe oxyhydroxides were estimated from their concentrations in the authigenic material and in bottom water samples. These field-derived values of KFe-M and KFe-A were compared with those predicted by the surface complexation model, using laboratory-derived intrinsic adsorption constants and the water composition at the study site. Equilibrium constants (KPOM-M) were also calculated for the adsorption of the cationic trace elements onto the humic substances contained in the diagenetic material. The field-derived values of KPOM-M were compared to those predicted by the speciation code WHAM 6 for the complexation of the trace elements by dissolved humic substances in the lake. Combining the results of the present study with those on the distributions of trace elements in the porewater and solid-phase sediments reported in previous studies at the same site, it was determined whether the trace elements bind preferentially to Fe oxyhydroxides or natural organic matter in oxic sediments. The main inferences are that the anionic trace elements As, Mo and Sb, as well as the cationic metal Pb are preferentially bound to the authigenic Fe oxyhydroxides whereas the other trace elements, and especially Hg and MeHg, are preferentially bound to the humic substances. (C) 2010 Elsevier Ltd. All rights reserved.
PY 2010
PD JUN
SO Applied Geochemistry
SN 0883-2927
PU Pergamon-elsevier Science Ltd
VL 25
IS 7
UT 000279093900006
BP 984
EP 995
DI 10.1016/j.apgeochem.2010.04.005
ID 11839
ER

EF