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Sökning: id:"swepub:oai:DiVA.org:umu-60708" > Mercury methylation...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00004235naa a2200433 4500
001oai:DiVA.org:umu-60708
003SwePub
008121023s2012 | |||||||||||000 ||eng|
009oai:slubar.slu.se:41016
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-607082 URI
0247 a https://doi.org/10.1021/es30153272 DOI
0247 a https://res.slu.se/id/publ/410162 URI
040 a (SwePub)umud (SwePub)slu
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Jonsson, Sofi,d 1984-u Umeå universitet,Kemiska institutionen,Umeå marina forskningscentrum ; EcoChange4 aut0 (Swepub:umu)soijon03
2451 0a Mercury methylation rates for geochemically relevant HgII species in sediments
264 c 2012-10-25
264 1b American Chemical Society (ACS),c 2012
338 a print2 rdacarrier
520 a 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.
650 7a NATURVETENSKAPx Kemi0 (SwePub)1042 hsv//swe
650 7a NATURAL SCIENCESx Chemical Sciences0 (SwePub)1042 hsv//eng
650 7a LANTBRUKSVETENSKAPERx Lantbruksvetenskap, skogsbruk och fiskex Skogsvetenskap0 (SwePub)401042 hsv//swe
650 7a AGRICULTURAL SCIENCESx Agriculture, Forestry and Fisheriesx Forest Science0 (SwePub)401042 hsv//eng
7001 a Skyllberg, Ulfu Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management4 aut0 (Swepub:slu)47403
7001 a Nilsson, Matsu Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management4 aut0 (Swepub:slu)47620
7001 a Westlund, Per-Olof,d 1952-u Umeå universitet,Kemiska institutionen4 aut0 (Swepub:umu)pewe0001
7001 a Shchukarev, Andreyu Umeå universitet,Kemiska institutionen,Technical Chemistry4 aut0 (Swepub:umu)ansh0001
7001 a Lundberg, Eriku Umeå universitet,Umeå marina forskningscentrum (UMF),EcoChange ; UMFpub4 aut0 (Swepub:umu)erlu0001
7001 a Björn, Eriku Umeå universitet,Kemiska institutionen,EcoChange4 aut0 (Swepub:umu)erkbjn97
7102 a Umeå universitetb Kemiska institutionen4 org
7102 a Sveriges lantbruksuniversitet
7730 t Environmental Science and Technologyd : American Chemical Society (ACS)g 46:21, s. 11653-11659q 46:21<11653-11659x 0013-936Xx 1520-5851
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-60708
8564 8u https://doi.org/10.1021/es3015327
8564 8u https://res.slu.se/id/publ/41016

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