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

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• 作者：Runsheng Yin ; Xinbin Feng ; Bo Meng
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2013
• 出版时间：March 5, 2013
• 年：2013
• 卷：47
• 期：5
• 页码：2238-2245
• 全文大小：330K
• 年卷期：v.47,no.5(March 5, 2013)
• ISSN：1520-5851

文摘

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 3.0鈥?in 未²⁰²Hg values and that mass independent fractionation (MIF) of Hg isotopes affected the odd Hg isotopes to produce a 0.40鈥?range in 螖¹⁹⁹Hg (and 螖²⁰¹Hg) values in tissues of rice plant. The 1:1 螖¹⁹⁹Hg/螖²⁰¹Hg 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鈥?in 未²⁰²Hg 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.