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| Investigation of the factors affecting the absorption of inorganic mercury and methylmercury by rice in the Wanshan mercury mining area |
| Received:April 03, 2017 |
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| KeyWord:rice;mercury;Wanshan;methylmercury |
| Author Name | Affiliation | | ZHONG Shun-qing | Hunan Provincial Engineering Laboratory for Technology of Traditional Settlements Digitalization, Hengyang 421002, China
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
College of City and Tourism, Hengyang Normal University, Hengyang 421002, China | | QIU Guang-le | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China | | MENG Bo | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
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| Abstract: |
| The health risk caused by the accumulation of mercury(Hg) and methylmercury(MeHg) in rice grain has gained increasing attention. To investigate the factors that affect the uptake of inorganic Hg and MeHg in rice in the Wanshan mercury mine area of Guizhou Province, rice plant and soil samples were collected at Gou Xi village, Aozhai village, and Sikeng and Wukeng. Using correlation analysis, we investigated the effects of soil factors, such as inorganic Hg and sulfur content, soil pH, total sulfur, organic matter, and MeHg, on the absorption of methylmercury and inorganic mercury by rice at the tillering stage. The results showed that the contents of inorganic Hg in the roots and stems of rice and in soil were positively correlated(r=0.987 and 0.786, respectively). There was a further negative correlation between inorganic Hg in rice leaves and soil pH value(r=-0.645), and a positive correlation between inorganic Hg in leaves and total sulfur in soil(r=0.621). A positive correlation was also found between the concentration of MeHg in roots and leaves and that in soil(r=0.710 and 0.599, respectively). However, there were no significant correlations with other soil parameters such as total sulfur, inorganic Hg, organic matter, and pH value. The amount of iron plaque on the roots of rice at Gou Xi was greater than that at the other sites, and there was a posi tive correlation between the content of inorganic Hg in roots and the adsorption of iron plaque(r=0.891). No similar relationship was detected for MeHg. The findings of this study showed that the content of inorganic Hg and MeHg in the soil was the key factor influencing the absorption of inorganic Hg and MeHg by rice plants in the Wanshan mercury mine area, and indicated that there were different paths for the absorption of inorganic Hg and MeHg in rice. |
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