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

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.