天津市景观水体底泥重金属污染状况综合评价

针对天津市景观河道底泥重金属污染进行了调研,分析了各采样点Zn、Cr、Pb、Cu、Cd 5种重金属的污染情况,采用美国NOAA标准对底泥重金属污染进行生物安全性评估和模糊综合评价,以及采用地积累指数法（排除背景值的影响）对重金属的富集程度进行了评价。结果显示：除子牙河外,天津市景观河道重金属污染都比较严重;重金属Zn、Cu、Cd对河道底泥污染的贡献较大,而Pb、Cr对河道底泥污染的贡献较小;城市工业化和开发是造成河道重金属污染的一个重要原因;＂城市水环境改善与水源保护示范工程研究＂的工程示范对河道水体改善作用有明显的效果,建议政府大力推广。

Comprehensive Evaluation of Heavy Metal Polluted Urban River Sediment in Tianjin

Heavy metals in urban river sediment of Tianjin were investigated.The pollution of Zn,Cr,Pb,Cu and Cd in each sampling point was analyzed and evaluated by Biological Safety Assessments and Fuzzy Comprehensive Evaluation based on the US NOAA Sediment Quality Standard.The accumulation degree of heavy metals was assessed by Geo-accumulation Index（to exclude the effect of background value）.Evaluation results showed that the sediment of most rivers in Tianjin was heavily polluted by the investigated heavy metals,except Ziya River.The pollution of Zn,Cu and Cd were heavier,comparing with that of Cr and Pb.The urban industrialization and development was one of the important reasons for heavy metal contamination of river sediment.A demonstration project of municipal water environment improvement and water source protection in the investigated rivers showed obvious effect in improving river environment quality.Thus,the remediation project should be generalized in the future to maintain a good water environment.