DOI: 10.1016/j.chemosphere.2020.126001
论文题名: Mercury methylation and demethylation potentials in Arctic lake sediments
作者: Hudelson K.E. ; Drevnick P.E. ; Wang F. ; Armstrong D. ; Fisk A.T.
刊名: Chemosphere
ISSN: 456535
出版年: 2020
卷: 248 语种: 英语
英文关键词: Arctic warming
; Biogeochemistry
; Isotope amendment
; Lacustrine sediments
; Mercury methylation
Scopus关键词: Alkylation
; Biogeochemistry
; Isotopes
; Lake pollution
; Lakes
; Mercury (metal)
; Mercury compounds
; Methylation
; Arctic warming
; Exposure pathways
; Hg stable isotopes
; Incubation temperatures
; Lacustrine sediments
; Mercury methylation
; Organic matter content
; Temperature treatments
; Sediments
; fresh water
; mercury
; biogeochemistry
; concentration (composition)
; global warming
; lacustrine deposit
; mercury (element)
; methylation
; methylmercury
; organic matter
; sediment chemistry
; stable isotope
; temperature effect
; tracer
; transformation
; air temperature
; Arctic
; Article
; climate warming
; cold
; controlled study
; demethylation
; freeze drying
; incubation temperature
; lake sediment
; limit of detection
; methylation
; temperature sensitivity
; water temperature
; Canada
; Canadian Arctic
英文摘要: Mercury (Hg) transformations in sediments are key factors in the Hg exposure pathway for wildlife and humans yet are poorly characterized in Arctic lakes. As the Arctic is rapidly warming, it is important to understand how the rates of Hg methylation and demethylation (wich determine Hg bioavailability) change with temperature in lake sediments. Methylation and demethylation potentials were determined for littoral sediments (2.5 m water depth) in two deep and two shallow lakes in the Canadian Arctic using Hg stable isotope tracers at incubation temperatures of 4, 8, or 16 °C for 24 h. Compared to sediments from other regions, Hg methylation and demethylation potentials in these sediments are low. The maximum depth of the lake from which sediment was collected exerted a stronger influence over methylation potential than sediment Hg concentration or organic matter content; the shallowest lake had the highest Hg methylation potential. Sediments from the shallowest lake also demonstrated the greatest response to the temperature treatments, with significantly higher methylation potentials in the 8 and 16 °C treatments. Sediments from the deep lakes demonstrated greater demethylation potentials than shallow lakes. The methylmercury to total Hg ratio in sediments supported the measured transformation potentials as the lake with the greatest methylation potential had the highest ratio. This study supports previous works indicating that Hg methylation potential may increase as the Arctic warms, but demethylation potential does not respond to warming to the same degree, indicating that Hg methylation may predominate in warming Arctic sediments. © 2020 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158161
Appears in Collections: 气候变化与战略
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作者单位: Centre Eau Terre Environnement, Institut National de la Recherche Scientifique, Université du Québec, QuébecQC G1K 9A9, Canada; Great Lakes Institute for Environmental Research, University of Windsor, Windsor, ON N9B 3P4, Canada; Alberta Environment and Parks, Environmental Monitoring and Science Division, Calgary, AB T2E 7L7, Canada; Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
Recommended Citation:
Hudelson K.E.,Drevnick P.E.,Wang F.,et al. Mercury methylation and demethylation potentials in Arctic lake sediments[J]. Chemosphere,2020-01-01,248