Isotopic composition of species-specific atmospheric Hg in a coastal environment
Isotopic composition of species-specific atmospheric Hg in a coastal environment
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DOI：
10.1016/j.chemgeo.2012.10.007
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发表时间：
2013-01
期刊：
影响因子：
3.9
通讯作者：
J. Rolison;W. Landing;W. Luke;Mark D. Cohen;V. Salters
中科院分区：
文献类型：
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作者：
J. Rolison;W. Landing;W. Luke;Mark D. Cohen;V. Salters
研究了美国密西西比州格兰德湾沿岸环境中大气汞的同位素组成。大气汞物种（Hg 0（g），Hg II（g）和Hg（p））分别收集，并进行同位素组成分析。气态元素汞（Hg 0（g））的δ 202 Hg值在−3.88‰ ~ −0.33‰之间。气溶胶汞（Hg（p））的δ 202 Hg值介于-1.61 ‰ ~-0.12 ‰之间，而反应性气态汞（HgII（g））的δ 202 Hg值为+0.51‰ ~+1.61‰。在Hg（p）中观察到显著的正质量非依赖分馏（MIF）（<$199Hg =+0.36‰至+1.36‰），而Hg 0（g）显示负MIF（<$199Hg =-0.41 ‰至-0.03 ‰），HgII（g）显示中间MIF（<$199Hg =-0.28 ‰至0.18‰）。在Hg（p）中测得的199 Hg和201 Hg的阳性MIF与气溶胶中显著的光还原一致。在所有汞物种中观察到200 Hg的显著MIF，其中Hg 0（g）显示负的200 Hg值，为−0.19‰至−0.06‰，而HgII（g）和Hg（p）显示正的200 Hg值，为+0.06‰至+0.28‰，与Gratz等人（2010年）报告的200 Hg值相似。这些结果表明，同位素示踪每个大气汞物种可能是可行的，在重要的大气过程，如湿和干沉降。
The isotopic composition of species-specific atmospheric mercury (Hg) was investigated in the coastal environment of Grand Bay, Mississippi, USA. Atmospheric mercury species (Hg0(g), HgII(g)and Hg(p)) were collected individually, and analyzed for isotopic composition. Gaseous elemental Hg (Hg0(g)) displayed δ202Hg ranging from −3.88‰ to −0.33‰. Aerosol Hg (Hg(p)) displayed intermediate δ202Hg ranging from −1.61‰ to −0.12‰, while reactive gaseous Hg (HgII(g)) displayed positive δ202Hg ranging from +0.51‰ to +1.61‰. Significant positive mass-independent fractionation (MIF) was observed in Hg(p)(∆199Hg=+0.36‰ to +1.36‰), while Hg0(g)displayed negative MIF (∆199Hg=−0.41‰ to −0.03‰) and HgII(g)displayed intermediate MIF (∆199Hg=−0.28‰ to 0.18‰). Positive MIF of199Hg and201Hg measured in Hg(p)is consistent with significant in-aerosol photoreduction. Significant MIF of200Hg was observed in all Hg species with Hg0(g)displaying negative ∆200Hg values of −0.19‰ to −0.06‰ while HgII(g)and Hg(p)displayed positive ∆200Hg values of +0.06‰ to +0.28‰, which are similar to ∆200Hg values reported by Gratz et al. (2010). These results suggest that isotope tracing of each atmospheric Hg species may be feasible during important atmospheric processes such as wet and dry deposition.