沈抚灌渠(抚顺段)底泥污染及潜在生态风险评价

Sediment Pollution of Shen-Fu Irrigation Channel(Fushun Section) and Its Potential Ecological Risk Assessment

采用单因子指数法和Hakanson潜在危害指数法,对沈抚灌渠底泥中Hg、As、Cu、Zn、Pb和Cd污染情况进行生态风险评价。结果表明:灌渠底泥中Hg、As、Cu、Zn、Pb和Cd含量均高于背景值,Hg、Zn的污染指数Cif达到严重污染级别,Cd、Cu、Pb的污染指数Cif属重污染级别,重金属污染程度排序为Hg>Zn>Cd>Cu>Pb>As,综合污染指数Cd属严重污染级别;灌渠底泥中Hg、As、Cu、Zn、Pb和Cd均具有不同程度的潜在生态风险,Hg和Cd具有极高和较高的潜在生态风险,其余4种重金属均为低风险。

By using single factor index method and Hakanson potential hazard index, an ecological risk assessment study was conducted for the pollution of Hg, As, Cu, Zn, Pb and Cd in the sediment of Shen-Fu irrigation channel. The results show that contents of Hg, As, Cu, Zn, Pb and Cd in the sediment are higher than the background values; The pollution indexes Cif of Hg and Zn reach the serious pollution level, while the pollution indexes Cif of Cd, Cu and Pb reach pollution level; The order of heavy metal pollution degree is Hg〉Zn〉Cd〉Cu〉Pb〉As. The comprehensive pollution index of Cd belongs to serious pollution level. The contents of Hg, As, Cu, Zn, Pb and Cd in the sediment present potential ecological risks at different degrees, potential ecological risks of Hg and Cd are respectively highest and higher, the rest 4 heavy metals are of low risk.