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云南某铅锌矿区周边农田土壤Cd、Pb分布特征及风险评价

DOI: 10.11654/jaes.2014.11.011, PP. 2143-2148

Keywords: 重金属,土壤,农作物,污染现状,健康风险

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Abstract:

通过大田调查云南省某铅锌矿区周边农田的土壤及农作物(马铃薯和玉米)中重金属Cd、Pb含量,对该区域重金属污染现状进行评价,结果表明:该区域内土壤中Cd和Pb平均含量分别为12.93、2246.48mg·kg-1,总体污染程度属于重污染;马铃薯内Cd、Pb含量分别为1.41、11.45mg·kg-1,玉米籽粒中Cd、Pb含量分别为1.18、12.50mg·kg-1。土壤重金属和土壤理化性质间的关系复杂,Cd与Pb之间呈极显著正关系,有效态Cd与总P、速效P呈极显著正相关关系;当pH≤6.5时,全量Cd和全量Pb与总P、速效P呈极显著正相关关系。该区域的土壤和食用作物已对当地居民的健康构成威胁。

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