Use of Stable Isotope Signatures to Determine Mercury Sources in the Great Lakes

	Use of Stable Isotope Signatures to Determine Mercury Sources in the Great Lakes
	Ryan F. Lepak; Runsheng Yin; David P. Krabbenhoft; Jacob M. Ogorek; John F. DeWild
	2015
发表期刊	Environmental Science & Technology
卷号	2 期号:12 页码:335-341
摘要	Sources of mercury (Hg) in Great Lakes sediments were assessed with stable Hg isotope ratios using multicollector inductively coupled plasma mass spectrometry. An isotopic mixing model based on mass-dependent (MDF) and mass-independent fractionation (MIF) (delta Hg-202 and Delta Hg-199) identified three primary Hg sources for sediments: atmospheric, industrial, and watershed-derived. Results indicate atmospheric sources dominate in Lakes Huron, Superior, and Michigan sediments while watershed-derived and industrial sources dominate in Lakes Erie and Ontario sediments. Anomalous Delta Hg-200 signatures, also apparent in sediments, provided independent validation of the model. Comparison of Delta Hg-200 signatures in predatory fish from three lakes reveals that bioaccumulated Hg is more isotopically similar to atmospherically derived Hg than a lake's sediment. Previous research suggests Delta Hg-200 is conserved during biogeochemical processing and odd mass-independent fractionation (MIF) is conserved during metabolic processing, so it is suspected even is similarly conserved. Given these assumptions, our data suggest that in some cases, atmospherically derived Hg may be a more important source of MeHg to higher trophic levels than legacy sediments in the Great Lakes.
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/6062
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Ryan F. Lepak,Runsheng Yin,David P. Krabbenhoft,et al. Use of Stable Isotope Signatures to Determine Mercury Sources in the Great Lakes[J]. Environmental Science & Technology,2015,2(12):335-341.
APA	Ryan F. Lepak,Runsheng Yin,David P. Krabbenhoft,Jacob M. Ogorek,&John F. DeWild.(2015).Use of Stable Isotope Signatures to Determine Mercury Sources in the Great Lakes.Environmental Science & Technology,2(12),335-341.
MLA	Ryan F. Lepak,et al."Use of Stable Isotope Signatures to Determine Mercury Sources in the Great Lakes".Environmental Science & Technology 2.12(2015):335-341.

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