| Geochemistry and environmental effect of cadmium in the super-large Jinding Pb-Zn deposit, Yunnan Province, China |
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| 作者单位： | LI Hang1，2，LI Dahua2，XIAO Tangfu1，HE Libin1，3，NING Zengping1，3，SUN Jialong1，3，ZHU Changsheng2，and SHUANG Yan2 1 The State Key Laboratory of Environmental Geochemistry，Institute of Geochemistry，Chinese Academy of Sciences，Guiyang 550002，China 2 Chongqing Institution of Geology and Mineral Resources，Chongqing 400042，China 3 Graduate University，Chinese Academy of Sciences，Beijing 100039，China |
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| 基金项目： | 国家自然科学基金，中国科学院基金，the Chongqing Institute of Geology and Mineral Resources |
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| 摘 要： | The Jinding Pb-Zn deposit in Yunnan Province is the representative of a Cd-enriched area and mining activities lead to the release of Cd into the hypergenic ecosystem, resulting in Cd pollution. The concentrations of Cd vary greatly from one type to another type of rocks in the mining district. In the host rock, Cd concentrations range from 50×10^-6 to 650×10^-6 with an average of 310×10^-6. In primary ores, Cd concentrations range from 14×10^-6 to 2800×10^-6 with an average of 767×10^-6. However, in oxidized ores, Cd concentrations are highest, varying within the range of 110×10^-6 to 8200×10^-6 , averaging 1661×10^-6. It is shown that the oxidized ores are the main carder and environmental source of Cd. Leaching test showed that Pb/Zn ores are easy to oxidize and thereafter release Cd and other harmful elements. These leached elements in the leachate may be precipitated rapidly in the order of Zn〉Pb〉Cd. As for the concentration distribution of Cd in the Bijiang River, it is estimated to be 15.7 μg/L Cd in water, 49.3 mg/L in suspended substances, and 203.7 mg/L in sediments. The average value of Cd in soil from the polluted area is 83.0 mg/kg. Natural weathering of Cd-rich rocks and minerals imposes a potential environmental risk on the aquatic ecosystem of the Bijiang catchment.
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| 关 键 词： | 地理特征 环境系统 镉 化合物 测定方法 |
| 收稿时间： | 2007-03-05 |
| 修稿时间： | 2007-06-08 |
Geochemistry and environmental effect of cadmium in the super-large Jinding Pb-Zn deposit,Yunnan Province,China |
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| Authors: | Hang Li Dahua Li Tangfu Xiao Libin He Zengping Ning Jialong Sun Changsheng Zhu Yan Shuang |
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| Institution: | (1) The State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China;(2) Chongqing Institution of Geology and Mineral Resources, Chongqing, 400042, China;(3) Graduate University, Chinese Academy of Sciences, Beijing, 100039, China |
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| Abstract: | The Jinding Pb-Zn deposit in Yunnan Province is the representative of a Cd-enriched area and mining activities lead to the
release of Cd into the hypergenic ecosystem, resulting in Cd pollution. The concentrations of Cd vary greatly from one type
to another type of rocks in the mining district. In the host rock, Cd concentrations range from 50×10−6 to 650×10−6 with an average of 310×10−6. In primary ores, Cd concentrations range from 14×10−6 to 2800×10−6 with an average of 767×10−6. However, in oxidized ores, Cd concentrations are highest, varying within the range of 110×10−6 to 8200×10−6, averaging 1661×10−6. It is shown that the oxidized ores are the main carrier and environmental source of Cd. Leaching test showed that Pb/Zn
ores are easy to oxidize and thereafter release Cd and other harmful elements. These leached elements in the leachate may
be precipitated rapidly in the order of Zn>Pb>Cd. As for the concentration distribution of Cd in the Bijiang River, it is
estimated to be 15.7 μg/L Cd in water, 49.3 mg/L in suspended substances, and 203.7 mg/L in sediments. The average value of
Cd in soil from the polluted area is 83.0 mg/kg. Natural weathering of Cd-rich rocks and minerals imposes a potential environmental
risk on the aquatic ecosystem of the Bijiang catchment. |
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| Keywords: | cadmium environmental geochemistry environmental effect Jinding Pb-Zn deposit |
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