海口湾东部表层沉积物重金属污染特征及生态风险评价

对海口湾东部10个表层沉积物中的重金属元素进行了分析,并运用Hakanson潜在生态危害指数法,对重金属的污染程度和潜在生态风险程度进行了评价。研究结果表明,表层沉积物中7种重金属平均含量高低依次为CrZnPbCuAsCdHg;重金属平均污染程度由高到低依次AsCrCdCuPbZnHg,As污染指数最高,属于中污染水平,其余各重金属处于低污染,7种重金属综合污染程度属于低水平;重金属的潜在生态风险大小依次为CdAsHgCuPbCrZn,Cd是主要的潜在生态风险因子,研究区域内重金属总的潜在生态风险程度低。该研究为了解海口湾东部海域重金属的污染现状提供了科学依据。

Contamination Characteristic and Potential Ecological Risk of Heavy Metals in the Surface Sediment from East Haikou Bay

Ten surface sediment samples from East Haikou Bay were collected for analyzing their heavy metals,and the contamination degree and potential ecological risks of these heavy metals were assessed by using Hakanson potential ecological index methods.The results showed that the order of average concentration of heavy metals was Cr>Zn>Pb>Cu>As>Cd>Hg.The average degree of contamination from to low high of these heavy metals was As>Cr>Cd>Cu>Pb>Zn>Hg.The pollution index of seven appeared to be the highest among all heavy metals,and was up to the middle level of contamination,and others were lower.The degree of integrated contamination index of seven heavy metals was low.The order of potential ecological risk level of all these heavy metals was Cd>As>Hg>Cu>Pb>Cr>Zn,and Cd was the principal potential ecological risk factor.The potential ecological risk level of integrated heavy metals was low in the study area.The study provided references for exploring the pollution status of Heavy metals in East Haikou Bay.