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《Geological Review》 1995-02
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Song Chengzu(No. 3 Exploration Engineering Party of Hubei Province, Huanggang, Hubei)  
Selenium pollution in Yutangba selenium mining area in southwestern Hubei caused serious selenium intoxication of local inhabitants through the food chain. It is estimated that the selenium content taken in by each person daily in the mining area is more than 30 mg. The Yutangba selenium deposit occurs in siliceous rocks of the Permian Maokou Formation. The selenium content at shallow depths is commonly (100 - 5400) × 10-6and may reach a maximum of 8390 ×10-6, being generally (5 - 300) × 10-6 higher than that at the surface.This paper discusses selenium pollution cuased by weathering and burning of lime. Experiments of soluble selenium leaching of selenium ore indicated that the content of selenium leached from alkaline solutions is the highest, being 73. 60×10-6, next comes that from acid solutions, being 0. 38×10-6, and that from distilled water is the lowest, being 0. 02×10-6, Experiments of soluble selenium leaching with different time durations indicated that more selenium can be leached in a longer leaching time or in the moving leaching solution. The elemental selenium is a continuous source for the formation of selenate and selenite, It follows thus that weathering is one of factor responsible for selenium pollution. When selenium ore (stone coal )is used as fuel for burning lime, the main pollutant is selenium left in the cinder of selenium ore besides selenium oxide and hydrogen selenium. Its content was determined to be up to (600-840) × 10-6, being a few to a few dozens of times higher than the ordinary selenium content (7 - 164) ×10-6, at the surface. So after weathered and diffused, the cinder of selenium ore left after burning of lime can pollute environment seriously.The measures such as planting selenium-rich plants and burial or total utilization of the waste of selenium ore etc. can actively prevent selenium pollution at Yutangba.
【CateGory Index】: X53
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