苏南地区农村河塘底泥中重金属污染调查与评价

Investigation and Assessment on Heavy Metal Pollution in Ponds Sediment of Southern Jiangsu Province

对苏南地区农村河塘底泥中重金属的污染物状况及分布特征进行了调查,分别在镇江、宜兴和常州采集了农村居民生活区、农田附近和养殖厂周围13个底泥样品,对底泥中的5种重金属Zn、Cu、Cd、Pb、Cr质量比进行了分析研究,并利用Hakason生态风险指数法评价了底泥中5种重金属对其所在水域的污染程度,对水域和周围环境造成的潜在风险影响。结果表明,苏南地区部分农村河塘底泥已受到轻度的重金属污染,部分采样点Cd、Cu和Zn已达到中度污染;不同类型底泥的重金属的污染程度趋势为:居民生活区>养殖厂周围>农田附近。

The situation and distribution of heavy metal pollutants were investigated in in the sediments of rural ponds of southern jiangsu province. Zinc, Copper, Cadmium,Lead and Chrome in the 13 sediment samples collected from habitation area and farmland of Zhenjiang, Yixing and Changzhou were determined. The potential influences on the water quality and the around environment involving the five heavy metals were evaluated by the ecological risk index of Hakason. The results showed the sediments of parts of the rural ponds in the southern Jiangsu province was polluted by heavy metals and the pollution situation reach middling level in some place. The order of the heavy metals pollution level in the ponds sentiment was in the rural residential area 〉 around breeding site 〉 nearby farmland.