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Mercury methylation...
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Jonsson, Sofi,1984-Umeå universitet,Kemiska institutionen,Umeå marina forskningscentrum ; EcoChange
(author)
Mercury methylation rates for geochemically relevant HgII species in sediments
- Article/chapterEnglish2012
Publisher, publication year, extent ...
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2012-10-25
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American Chemical Society (ACS),2012
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:umu-60708
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https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-60708URI
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https://doi.org/10.1021/es3015327DOI
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https://res.slu.se/id/publ/41016URI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Monomethylmercury (MeHg) in fish from freshwater, estuarine and marine environments are a major global environmental issue. Mercury levels in biota are mainly controlled by the methylation of inorganic mercuric mercury (HgII) to MeHg in water, sediments and soils. There is, however, a knowledge gap concerning the mechanisms and rates of methylation of specific geochemical HgII species. Such information is crucial for a better understanding of variations in MeHg concentrations among ecosystems and, in particular, for predicting the outcome of currently proposed measures to mitigate mercury emissions and reduce MeHg concentrations in fish. To fill this knowledge gap we propose an experimental approach using HgII isotope tracers, with defined and geochemically important adsorbed and solid HgII forms in sediments, to study MeHg formation. We report HgII methylation rate constants, km, in estuarine sediments which span over two orders of magnitude depending on chemical form of added tracer: metacinnabar (β-201HgS(s)) < cinnabar (α-199HgS(s)) < HgII reacted with mackinawite (≡FeS-202HgII) < HgII bonded to natural organic matter (NOM-196HgII) < a typical aqueous tracer (198Hg(NO3)2(aq)). We conclude that a combination of thermodynamic and kinetic effects of HgII solid-phase dissolution and surface desorption control the HgII methylation rate in sediments and causes the large observed differences in km-values. The selection of relevant solid-phase and surface adsorbed HgII tracers will therefore be crucial to achieving biogeochemically accurate estimates of ambient HgII methylation rates.
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Skyllberg, UlfSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management(Swepub:slu)47403
(author)
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Nilsson, MatsSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management(Swepub:slu)47620
(author)
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Westlund, Per-Olof,1952-Umeå universitet,Kemiska institutionen(Swepub:umu)pewe0001
(author)
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Shchukarev, AndreyUmeå universitet,Kemiska institutionen,Technical Chemistry(Swepub:umu)ansh0001
(author)
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Lundberg, ErikUmeå universitet,Umeå marina forskningscentrum (UMF),EcoChange ; UMFpub(Swepub:umu)erlu0001
(author)
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Björn, ErikUmeå universitet,Kemiska institutionen,EcoChange(Swepub:umu)erkbjn97
(author)
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Umeå universitetKemiska institutionen
(creator_code:org_t)
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Sveriges lantbruksuniversitet
Related titles
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In:Environmental Science and Technology: American Chemical Society (ACS)46:21, s. 11653-116590013-936X1520-5851
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