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Mercury in vegetation and soils at abandoned mercury mines in southwestern Alaska, USA

Geochemistry: Exploration, Environment, Analysis

By:
, , and
DOI: 10.1144/1467-787302-032

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Abstract

We chemically analysed vegetation (willow and alder) and soil samples collected at three abandoned mercury (Hg) mines and at background sites in southwestern Alaska and compared Hg concentrations, speciation and distribution. Total Hg and methylmercury (MeHg) concentrations were higher in vegetation and soil samples from all the mine sites compared to samples from the background sites, but there was no correlation between total-Hg concentrations in vegetation and total-Hg concentrations in soil or between total-Hg and MeHg concentrations. However, the percent MeHg of the total Hg was higher in samples from the background sites compared to samples from the mine sites and is higher in vegetation samples than in corresponding soil samples. The percent MeHg is an order of magnitude higher in the willow samples than in corresponding alder or soil samples. The percent of divalent Hg [Hg(II)] is highest in soil samples from the retort and background areas. The higher percent MeHg in vegetation and soil in samples from background sites may be explained by the higher proportions of reactive Hg species, such as Hg(II), at these sites compared to the surface mined and tailings areas where most of the Hg is in the elemental and cinnabar (HgS) forms. Dissolved gaseous Hg species are more readily accumulated in vegetation and are more readily methylated than solid phases like HgS and liquid Hg.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Mercury in vegetation and soils at abandoned mercury mines in southwestern Alaska, USA
Series title:
Geochemistry: Exploration, Environment, Analysis
DOI:
10.1144/1467-787302-032
Volume
2
Issue:
3
Year Published:
2002
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geochemistry: Exploration, Environment, Analysis
First page:
275
Last page:
285
Number of Pages:
11