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Organic Matter in Rain: An Overlooked Influence on Mercury Deposition
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Uppsala Centre for Sustainable Development, CSD Uppsala.
2015 (English)In: Environmental Science & Technology Letters, ISSN 2328-8930, Vol. 2, no 4, 128-132 p.Article in journal (Refereed) Published
Abstract [en]

The importance of Hg emissions for deposition will be scrutinized in the future as new legislation to control emissions of Hg to the atmosphere comes into effect. We show that mercury (Hg) concentrations in rainfall are closely linked to organic matter (OM) with consistent Hg/TOC ratios over large spatial scales decreasing from that in an open field (OF, 1.5 mu g g(-1)) to that in throughfall (TF, 0.9 mu g g(-1)). The leaf area index was positively correlated with both TF [Hg] and total organic carbon ([TOC]), but not the Hg/TOC ratio. This study shows that the progression in the Hg/TOC ratio through catchments starts in precipitation with Hg/TOCbulk dep > Hg/TOCsoil (water) > Hg/TOCstreamwater These findings raise an intriguing question about the extent to which it is not just atmospheric [Hg] but also OM that influences [Hg] in precipitation. This question should be resolved to improve the ability to discern the importance of changing global Hg emissions for deposition of Hg at specific sites.

Place, publisher, year, edition, pages
2015. Vol. 2, no 4, 128-132 p.
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-253066DOI: 10.1021/acs.estlett.5b00009ISI: 000353184700010OAI: oai:DiVA.org:uu-253066DiVA: diva2:820606
Available from: 2015-06-12 Created: 2015-05-20 Last updated: 2015-06-12Bibliographically approved

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Bishop, Kevin

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