泉州市不同功能区大气降尘重金属污染及生态风险评价

POLLUTION AND ECOLOGICAL RISK ASSESSMENT OF HEAVY METALS IN THE DUSTFALL FROM DIFFERENT FUNCTIONAL AREAS OF QUANZHOU CITY

通过泉州市不同功能区大气降尘中重金属含量分析,发现泉州市大气降尘中重金属Pb、Zn、Cu、Cr、Cd和Ni含量的平均值分别为284.49、1628.7、112.4、126.87、2.01和106.45mg·kg-1,同福建省海岸带土壤背景值相比,均处于较高的积累水平.潜在生态风险指数法评价结果表明:重金属污染程度顺序:Cd>Pb>Ni>Cu>Zn>Cr;不同功能区大气降尘重金属生态危害程度为:工业区>商业区>交通繁忙区>居民区>农业区.富集因子法污染评价表明:Cd、Zn的富集较严重,Pb、Ni次之,Cu、Cr在各功能区都没有富集.两种评价方法的评价结果较为一致。

Heavy metal contents in the dustfall collected from different functional areas in Quanzhou city were investigated.The results showed that the average contents of Pb,Zn,Cu,Cr,Cd and Ni were 284.49,1628.7,112.4,126.87,2.01 and 106.45 mg·kg-1 respectively.Compared with the background values of coastal soils in Fujian province,the heavy metal contents in the dustfall showed higher values.The assessment results of potential ecological risk of heavy metal pollution indicated that the pollution degree of single element showed the order of Cd Pb Ni Cu Zn Cr,and the comprehensive ecological hazardous degree of heavy metals in the dustfall from different functional areas followed the order of industrial area commercial area heavy traffic area residential area agricultural area.The method of enrichment factor was used to evaluate the contamination of heavy metals in dustfall.And the results showed that the enrichments of Cd and Zn were considerably serious,followed by Pb and Ni,whereas Cu and Cr presented no enrichment in each functional area.The results of the above two evaluation methods were similar.