FN Archimer Export Format
PT J
TI Mercury speciation and exchanges at the air-water interface of a tropical artificial reservoir, French Guiana
BT 
AF MURESAN PASLARU, Bogdan
   COSSA, Daniel
   RICHARD, S
   BURBAN, B
AS 1:1;2:1;3:2;4:2;
FF 1:;2:PDG-DOP-DCN-BE-LBCM;3:;4:;
C1 IFREMER, F-44311 Nantes 3, France.
   HYDRECO, Lab Petit Saut, F-97388 Kourou, French Guiana, France.
C2 IFREMER, FRANCE
   HYDRECO, FRANCE
SI TOULON
SE PDG-DOP-DCN-BE-LBCM
IN WOS Ifremer jusqu'en 2018
   copubli-france
IF 2.182
TC 17
UR https://archimer.ifremer.fr/doc/2007/publication-3329.pdf
LA English
DT Article
DE ;Fluxes;Speciation;Mercury;Artificial reservoir;Atmosphere
AB The distribution and speciation of mercury (Hg) in air, rain, and surface waters from the artificial tropical lake of Petit-Saut in French Guiana were investigated during the 2003/04 period. In the air, total gaseous mercury (TGM) at the dam station averaged 12 +/- 2 pmol m(-3) of which > 98% was gaseous elemental mercury (GEM). GEM distribution depicted a day-night cycling with high concentrations (up to 15 pmol m(-3)) at dawn and low concentrations (down to 5 pmol m(-3)) at nightfall. Reactive gaseous mercury (RGM) represented < 1% of the GEM with a mean concentration of 4 3 fmol m(-3). Diel RGM variations were negatively related to GEM. In the rain, the sum of all Hg species in the unfiltered (HgTUNF) averaged 16 +/- 112 pmol L-1. Temporal distribution of HgTUNF exhibited a pattern of high concentrations during the late dry seasons (up to 57.5 pmol L-1) and low concentrations (down to 2.7 pmol L-1) in the course of the wet seasons. Unfiltered reactive (HgRUNF), dissolved gaseous (DGM) and monomethyl (MMHgUNF.) Hg constituted 20, 5 and 5% of HgTUNF, respectively. All measured Hg species were positively related and displayed negative relationships with the pH of the rain. In the reservoir surface waters, dissolved total mercury (HgTD) averaged 3.4 +/- 1.2 pmol L-1 of which 10% consisted of DGM. DGM showed a trend of high concentrations during the dry seasons (480 +/- 270 finol L-1 and lower (230 +/- 130 finol L-1) in the course of the wet seasons. Diel variations included diurnal photo-induced DGM production (of about 60 firiol L-1 h(-1)) coupled to minute to hour oxidation/ reduction cycles (of > 100 firiol L-1 amplitude). Finally, calculated atmospheric Hg inputs to the Petit-Saut reservoir represented 14 mot yr(-1) whereas DGM evasion reached 23 mol yr(-1). Apportionment among forms of Hg deposition indicated that up to 75% of the total Hg invasive flux follows the rainfall pathway. (C) 2007 Elsevier B.V. All rights reserved.
PY 2007
PD OCT
SO Science of The Total Environment
SN 0048-9697
PU Elsevier
VL 385
IS 1-3
UT 000250355300014
BP 132
EP 145
DI 10.1016/j.scitotenv.2007.06.013
ID 3329
ER

EF