Stable Mercury Isotope Variation in Rice Plants (Oryza sativa L.) from the Wanshan Mercury Mining District, SW China

	Stable Mercury Isotope Variation in Rice Plants (Oryza sativa L.) from the Wanshan Mercury Mining District, SW China
	Runsheng Yin; Xinbin Feng; Bo Meng
	2013
发表期刊	Environmental Science & Technology
卷号	47 期号:5 页码:2238-2245
摘要	To study the sources and transformations of Hg in the rice plant (Oryza sativa L.), stable Hg isotope variations in different tissues (foliage, root, stem, and seed) of rice which were collected from the Wanshan mercury mine (WSMM, Guizhou province, SW China) were investigated by multicollector inductively coupled plasma mass spectrometry (MC-ICP-MS). In comparison, Hg isotope compositions of paddy soil, lichen, and direct ambient air samples in WSMM were also analyzed. We observed that mass dependent fractionation (MDF) of Hg differed by up to similar to 3.0 parts per thousand in delta Hg-202 values and that mass independent fractionation (MIF) of Hg isotopes affected the odd Hg isotopes to produce a similar to 0.40 parts per thousand range in Delta Hg-199 (and Delta Hg-201) values in tissues of rice plant. The 1:1 Delta Hg-199/Delta Hg-201 ratio in tissues of rice supported the hypothesis that a fraction of Hg in tissues of rice plants has undergone a photoreduction process prior to being accumulated by rice plants. We suggest that the variation of MIF represents a mixing between soil Hg and atmospheric Hg in rice plants. The estimated fraction of atmospheric Hg (f) in tissues of rice followed the trend of f leaf > f(stem) > f(seed) > f(root). Finally, we demonstrated a significant MDF of >1.0 parts per thousand in delta Hg-202 during the processes of absorption of atmospheric Hg by leaf tissues and of absorption of soil Hg by roots. Our study demonstrated that Hg isotopes may represent an important contribution both to the study of Hg transportation in plants and to the understanding of sources of Hg contamination to critical food crops.
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/352002/5092
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_期刊论文环境地球化学国家重点实验室
推荐引用方式 GB/T 7714	Runsheng Yin,Xinbin Feng,Bo Meng. Stable Mercury Isotope Variation in Rice Plants (Oryza sativa L.) from the Wanshan Mercury Mining District, SW China[J]. Environmental Science & Technology,2013,47(5):2238-2245.
APA	Runsheng Yin,Xinbin Feng,&Bo Meng.(2013).Stable Mercury Isotope Variation in Rice Plants (Oryza sativa L.) from the Wanshan Mercury Mining District, SW China.Environmental Science & Technology,47(5),2238-2245.
MLA	Runsheng Yin,et al."Stable Mercury Isotope Variation in Rice Plants (Oryza sativa L.) from the Wanshan Mercury Mining District, SW China".Environmental Science & Technology 47.5(2013):2238-2245.

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