Importance of elemental mercury in lake sediments

被引：46

作者：

Bouffard, Ariane ^{[1
]}

Amyot, Marc ^{[1
]}

机构：

[1] Univ Montreal, Dept Sci Biol, Montreal, PQ H3C 3J7, Canada

来源：

CHEMOSPHERE | 2009年 / 74卷 / 08期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Redox chemistry; Adsorption; Reduction; DGM; Bioavailability; DISSOLVED GASEOUS MERCURY; CONTAMINATED SOILS; HUMIC SUBSTANCES; TEMPERATE LAKES; WATER INTERFACE; NATURAL-WATERS; BINDING FORMS; SPECIATION; REDUCTION; VAPOR;

D O I：

10.1016/j.chemosphere.2008.10.045

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Mercury (Hg) redox changes in sediments are poorly studied and understood, even though they potentially control Hg availability for methylation and can alter sediment-water Hg exchange. Elemental Hg (Hg-0) concentrations in sediments of two Canadian Shield lakes were assessed by thermodesorption. Hg-0 concentrations in sediments varied between 6.3 and 60.3 pg g(-1) (wet weight) which represented 7.4-28.4% of total mercury (HgT) concentration. Hg-0 concentrations were similar in both lakes. Hg-0 was rapidly adsorbed on sediments in controlled adsorption experiments and surface sediments sampled in summer had a stronger affinity for Hg-0 than deeper sediments and sediments sampled in fall. This adsorption was positively correlated to organic matter content and negatively related to particle grain size, pH and oxygen concentration in overlying water. This study demonstrates that Hg-0 is a prevalent species in sediments, but not in porewater, because of the high sorptive capacity of sediments towards Hg-0. Its potential availability towards Hg methylating bacteria remains to be determined. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1098 / 1103

页数：6

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