养殖池塘沉积物的重金属分布及污染特征

浙江省淅西北地区淡水养殖池塘沉积物重金属调查研究表明，养殖池塘沉积物中7种重金属元素分布不均衡，差异也较大，除Hg和Cr元素外，其余重金属元素已大大超过土壤本底值．虽然其实测含量都未超出国家规定的标准值范围，但沉积物中重金属元素对养殖水环境、养殖品种存在的潜在污染与危害值得关注．污染指数评价显示，养殖池塘沉积物中主要污染物质为Cu和Cr，而Hg、Pb污染程度相对较轻．

Heavy Metal Distribution and Pollution Characteristics in the Sediments of Aquaculture Ponds

Heavy Metals in the sediments of freshwater ponds for aquaculture in Zhjiang Province are investigated. The distribution of 7 heavy metal elements varies greatly. Level of various heavy metals except for Hg and Cr is much higher than the background value of soil. Although the determined content of heavy metal are lower than the criteria ranges regulated by national standards, the heavy metals accumulation in the pond sediments would be a potential pollution to water environment and harm the farming species. Pollution indexes assessment shows that the pollution in the pond sediments results mainly from Cu and Cr, while pollution from Hg and Pb is relatively small.