顺德鳗鱼养殖场沉积物重金属污染调查与评价

目的:了解顺德地区鳗鱼养殖场沉积物重金属污染情况。方法:采用蓄积系数法和Hakanson潜在生态风险指数法,分析评价该地区2004年鳗鱼养殖场表层沉积物Hg、Cd、Pb、As4种重金属污染状况。结果:鱼塘表层沉积物中Hg、Cd、Pb、As平均富集系数分别为2·6,19·7,1·0和1·7。潜在生态危害评价显示,除一个调查点Hg达到中等危害程度外,其他均为生态轻微污染。4种重金属污染风险排序为:Cd=Hg>As>Pb。结论:重金属污染中,Hg、Cd为该地区潜在危害最大的两种重金属。

INVESTIGATION AND EVALUATION ON HEAVY METAL POLLUTION OF SEDIMENT IN SHUNDE

Objective:To investigate the heavy metal pollution of sediment in Shunde city.Methods:Enrichment coefficient technique and Hakanson potential ecological risk index were adopted to analyse and evaluate the heavy metal pollution(i.e.Hg,Cd,Pb,As)of surface sediment of raising pond in Shunde city,Guangdong province during 2004.Results:The result showed that the average enrichment coefficients of Hg,Cd,and Pb as insurface sediment were 2.6,1 9.7,1.0 and 1.7 respectively.Potential ecological risk indexes were low in all spots investigated except that Hg of one spot was moderate.The order of potential ecological risk index of four heavymetals was Cd=Hg>As>Pb.Conclusion:Hg and Cd was the biggest potential risk facts in the metal pollution in the areas.