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Assessment of selenium pollution in agricultural soils in the Xuzhou District,Northwest Jiangsu, China

查看全文 作　　者：HUANG [1]Shunsheng;HUA [1]Ming;FENG [1]Jinshun;ZHONG [2]Xinyong;JIN [1]Yang;ZHU [1]Baiwan;LU [1]Hua 高影响力作者 机构地区：[1]Geological Survey of Jiangsu Province, Nanjing 210018, China;[2]Department of Land Environment & Resources of Hainan Province, Haikou 570203, China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2009年第21卷第4期,共7页高影响力期刊 基　　金：supported by the Geological Survey of China and the Jiangsu Province Program 'Multipurpose Geochemical Survey of Jiangsu Province' (No.200312300008) 摘　　要：Xuzhou City is an important base for coal production and coal-fired power. To evaluate selenium contamination in this area, we sampled agricultural soil, soil profile, irrigation water, bedrock, coal, fly ash, paddy rice, and vegetables from the north of Xuzhou City, and determined their selenium contents. The background level of selenium in the soil profile was 0.08 mg/kg. The selenium concentrations in agricultural soils and irrigation water were in the range of 0.21-4.08 mg/kg and 0.002-0.29 mg/L, respectively. Soils with high selenium content were located closely to coalmines and power plants. The average selenium concentrations in coal and coal fly ash were 5.46 and 2.81 mg/kg, respectively. In contrast, the concentrations of selenium in bedrock and in the soil profile were very low. These results imply that the high selenium level in agricultural soils is mainly caused by anthropogenic activities, rather than by parent material. The arithmetic mean of selenium concentration in paddy rice was 0.116 mg/kg, and in cabbage was 0.05 mg/kg. The selenium concentration in rice was positively correlated with total selenium concentration in soil, suggesting that selenium in soil is readily transferred into the crops. Furthermore, the estimated dietary intake (88.8 μg) of selenium from paddy rice and cabbage exceeds the recommended dietary allowance (55 μg). Therefore, there is a potential health risk from consumption of local staple food in the study area. 关 键 词：农田土壤 硒污染 徐州地区 西北地区 江苏省 燃煤电厂 评估 农业土壤
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