| Distribution of uranium and thorium in Irtysh River and the upriver wastewater from a rare metal mine impact on it |
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| 作者姓名： | Shehong LI Baoshan ZHENG Jianming ZHU Xiaoying YU |
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| 作者单位： | State Key Lab. of Environ. Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China |
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| 摘 要： | Uranium and Th are important radioactive elements. Most studies were focused on their environmental impact from uranium deposits and mining sites. But other sorts of mines such as rare metals mines are associated highly with uranium and thorium, too. In China, the Irtysh River is the only river that runs into the Arctic Ocean. The famous Koktokay rare metal pegmatite deposit is located in the headwater region of this river and has been exploited for several decades. The waste ore piled along the riverside as long as several kilometers. The wastewater flom the concentrating plant is discharged into the river directly. In addition, uranium and thorium can be leached from the waste ore into the river in the weathering process. So it is necessary to study the uranium and thorium distribution in the branch and trunk streams of the Irtysh River and the wastewater from the mining site impact on it. In this study, the contents of uranium and thorium in water samples from the Irtysh River and rare metal mine wastewater have been detected directly with ICP-MS. Uranium and thorium distribution and geochemical behaviors in the Irtysh River basin have been studied. The environmental uranium and thorium pollution status in the Irtysh River and wastewater from a rare metal mine impact on it have also been evaluated. The study shows that uranium and thorium contents in wastewater from a rare metal mine are as high as 78.311 μg/L and 0.627 μg/L, respectively, so we should also pay attention to the radioactive pollution from the rare metal mine. The average contents of U and Th in the branch streams of the Irtysh River are 0.572 μg/L and 0.015 μg/L, respectively. At the mean time, in the trunk of the Irtysh River, average thorium content is 0.019 μg/L while U is up to 2.234 μg/L, much higher than the average content （0.0309 μg/L） of the world rivers. From upstream to downstream in the trunk of the Irtysh River, thorium content declines gradually due to dilution by other branches and deposition itself.
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| 关 键 词： | 稀有金属矿 水体污染 河流 铀 钍 废水 |
Distribution of uranium and thorium in Irtysh River and the upriver wastewater from a rare metal mine impact on it |
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| Shehong LI Baoshan ZHENG Jianming ZHU Xiaoying YU.Distribution of uranium and thorium in Irtysh River and the upriver wastewater from a rare metal mine impact on it[J].Chinese Journal of Geochemistry,2006,25(B08):43-44. |
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| Abstract: | |
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| Keywords: | rare metal mine river pollution uranium and thorium distribution |
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