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| Distribution and Influencing Factors of Mercury in Rice Grains in Wanshan |
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| KeyWord:Wanshan; Hg-mining areas; rice THg ; soil properties; correlation |
| Author Name | Affiliation | | YIN De-liang | The Key Laboratory of Karst Environment and Geohazard Prevention, Ministry of Education, Guizhou University, Guiyang 550025, China | | HE Tian-rong | The Key Laboratory of Karst Environment and Geohazard Prevention, Ministry of Education, Guizhou University, Guiyang 550025, China | | AN Yan-ling | The Key Laboratory of Karst Environment and Geohazard Prevention, Ministry of Education, Guizhou University, Guiyang 550025, China | | LUO Guang-jun | The Key Laboratory of Karst Environment and Geohazard Prevention, Ministry of Education, Guizhou University, Guiyang 550025, China | | YANG Xu | The Key Laboratory of Karst Environment and Geohazard Prevention, Ministry of Education, Guizhou University, Guiyang 550025, China | | CHEN Jun | College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China |
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| Abstract: |
| Total mercury（THg） concentrations in rice grains from Wanshan, Guizhou province, which was impacted by Hg mining, were measured using a CVAFS method. THg concentrations in the rice grains showed a clear spatial pattern and were highly related to the inputs of Hg derived from mining. Concentrations of THg in rice grains in major basins of Hg mining ranged from 2.8 ng·g-1 to 295 ng·g-1 with an average of 50.8 ng·g-1. Approximate 67.5% of rice samples showed THg concentrations exceeding the national standards（THg=20 ng·g-1）. Rice THg concentrations tended to decrease from central Hg-mined areas to less polluted ones. However, the decreasing rates of THg concentrations in rice were quite different in the six areas. Rice THg concentrations were significantly positively correlated with TS, TN, organic matter, and pH, but negatively with SiO2. Rice THg had no correlation with soil THg concentrations. |
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