Mercury Cycling in Stream Ecosystems. 1. Water Column Chemistry and Transport

被引：215

作者：

Brigham, Mark E. ^{[1
]}

Wentz, Dennis A. ^{[2
]}

Aiken, George R. ^{[3
]}

Krabbenhoft, David P. ^{[4
]}

机构：

[1] US Geol Survey, Mounds View, MN 55112 USA

[2] US Geol Survey, Portland, OR 97201 USA

[3] US Geol Survey, Boulder, CO 80303 USA

[4] US Geol Survey, Middleton, WI 53562 USA

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2009年 / 43卷 / 08期

关键词：

METHYLMERCURY; RIVERS; MINNESOTA; CATCHMENT;

D O I：

10.1021/es802694n

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We studied total mercury (THg) and methylmercury (MeHg) in eight streams, located in Oregon, Wisconsin, and Florida, that span large ranges in climate, landscape characteristics, atmospheric Hg deposition, and water chemistry. While atmospheric deposition was the source of Hg at each site, basin characteristics appeared to mediate this source by providing controls on methylation and fluvial THg and MeHg transport. Instantaneous concentrations of filtered total mercury (FrHg) and filtered methylmercury (FMeHg) exhibited strong positive correlations with both dissolved organic carbon (DOC) concentrations and streamflow for most streams, whereas mean FrHg and FMeHg concentrations were correlated with wetland density of the basins. For all streams combined, whole water concentrations (sum of filtered and particulate forms) of THg and MeHg correlated strongly with DOC and suspended sediment concentrations in the water column.

引用

页码：2720 / 2725

页数：6

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