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Tributary loading of mercury to Lake Michigan: Importance of seasonal events and phase partitioning

Science of the Total Environment

By:
, , ,
DOI: 10.1016/S0048-9697(98)00084-9

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Abstract

As a component of a lakewide mass balance study for Lake Michigan, we measured total mercury (Hg(T)) concentrations and fluxes in 11 selected tributaries. Unfiltered Hg(T) concentrations ranged from 0.56 ng l-61 at the Pete Marquette River to 182 ng l-1 at the Fox River. Highest mean Hg(T) concentrations were observed in the Fox R., Indiana Harbor Ship Canal, Grand R. and the Kalamazoo R. Mean particulate matter Hg(T) content ranged from about 0.1 to 1.5 ??g g-1, with highest levels from the industrialized basins of the Indiana Harbor and Fox River. Highest tributary loading rates (g day-1) were observed from the Fox, Grand, Kalamazoo and St. Joseph Rivers. Increased loading rates during spring melt and summer/fall storm events in these tributaries were generally associated with particulate loading from either sediment resuspension or erosional processes. In contrast, filtered Hg(T) represented 80% of the Hg(T) flux in the Manistique R., whose watershed is comprised almost entirely of wetlands and forest.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Tributary loading of mercury to Lake Michigan: Importance of seasonal events and phase partitioning
Series title:
Science of the Total Environment
DOI:
10.1016/S0048-9697(98)00084-9
Volume
213
Issue:
1-3
Year Published:
1998
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
129
Last page:
137
Number of Pages:
9