Mercury in forest canopy throughfall water and its relation to atmospheric deposition

Deposition rates of Hg to forested land areas have been studied for 13 mo in two small forested catchments in south-western Sweden. Monthly sampling of forest canopy throughfall water in a mature Norwegian spruce stand and precipitation to an open field was carried out. Hg deposited to the catchment...

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Bibliographic Details
Published in:Water, air and soil pollution air and soil pollution, 1991-04, Vol.56 (1), p.553-564
Main Author: IVERFELDT, A
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Freshwater
Natural water pollution
Pollution
Rainwaters, run off water and others
Water treatment and pollution
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Summary:Deposition rates of Hg to forested land areas have been studied for 13 mo in two small forested catchments in south-western Sweden. Monthly sampling of forest canopy throughfall water in a mature Norwegian spruce stand and precipitation to an open field was carried out. Hg deposited to the catchments via litter fall was also considered. Integrated monthly samples of both precipitation and throughfall water were collected by 6 and 45 separate collectors, respectively, designed for an unbiased Hg sampling. The average Hg concentration in precipitation during this period was 13.0 plus or minus 4.0 ng Hg L super(-1). The results show that annual dry deposition of Hg to a spruce stand in throughfall water can be 50% of the wet deposition, 4 to 7 compared to 12 g Hg km super(-2)/yr, respectively. A strong seasonal trend in Hg deposition via throughfall water is also present.
ISSN:0049-6979
1573-2932
DOI:10.1007/BF00342299