摘要:
在青海东部地区表层、深层土壤重金属调查基础上,根据国家《土壤重金属污染评价标准》( GB15618?1995),对土壤中重金属污染状况进行评价;重点选择甘河滩地区,对区内单点样、植物样、水样、地球化学剖面结果进行探讨;比较了Cd、Hg在不同时期污染形势的变化。综合分析认为,青海省东部地区重金属污染总体上并不严重,但在甘河滩一带Zn、Cd、Pb在不同介质中形成较为明显的循环污染,污染程度已达深层,不适宜农业发展;时间尺度上,Cd污染有加剧趋势,Hg污染状况有所改善。
关键词:
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重金属
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土壤
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分布特征
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评价
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防治
Abstract:
According to the investigation of heavy metal content in topsoil and deep soil in the east of Qinghai, the authors used Nation?al Standard ( GB15618?1995) as the evaluation standard. The status of heavy metals in the soil was evaluated, and the situation of heavy metal pollution in Ganhetan was discussed by combining single soil samples, plant samples, water samples and geochemical sec?tions. Two heavy metals ( Cd, Hg) were selected to compare the situation of their pollution in different periods. The results indicate that the heavy metal pollution in eastern Qinghai is not serious, but some heavy metals such as Zn, Cd, Pb in Ganhetan have formed obvi?ous circular pollution, and the pollution has reached deep soil. Agricultural development is not suitable in this area. It is found that the pollution of some heavy metals such as Cd has aggravated, whereas pollution of some heavy metals like Hg has been reduced.
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