在葫芦岛南侧海域采集35个表层沉积物样品,测定Pb,Cr,Zn,Cu,As,Hg等6种重金属含量,据其结果分析葫芦岛以南海域表层沉积物重金属的污染程度和特征,并分别采用地累积指数法和Hakanson评价法评价其污染状况。结果表明,该海域从东向西由远海至近岸污染程度不断加重,锌和汞的污染情况最为严重,超过一类沉积物质量标准的站位约占30%;铅的污染最轻,超标率为0。地累积指数法对该区域重金属污染评价结果表明,铬、铜、砷污染较轻,属于轻度甚至无污染水平;而汞污染较重,40%的站位达到中度污染水平。应用Hakanson评价法得出:除9个站位存在轻微潜在生态风险外,其余大部分站位都具中等甚至高生态风险性;Hg的潜在生态风险因子最大,对养殖区生物可能产生影响。

The contents of 6 heavy metal elements including Pb,Cr,Zn,Cu,As,Hg in surface sediments collected from the sea area of southern huludao were determined by Flame Atomic Absorption and Atomic Fluorescence.The level and the character of heavy metal pollution were analyzed according to the obtained data.Then,potential ecological risks assessment of the 6 heavy metal elements were done by using index of geoaccumulation method and Hakanson' evaluation method respectively.The pollution level in this area was becoming more and more serious from east to west,and from open sea to offshore marine areas.The pollution level of Zn,Hg were serious,the rates of samples exceeding first standard of sediment quality were 30%,the pollution level of Pb was the lowest,the rate of exceeding standard was 0.By using index of geoaccumulation method the results showed that the pollution level of Cr,Cu,As were belonging to low-grade or no pollution,but Hg pollution was serious,about 40% stations belonged to medium level.By using Hakanson potential ecological risks assessment the results showed that a majority of the stations were at medium or strong ecological risks in addition to 9 of them at weak risk.The potential ecological risk factor of Hg was maximal,it might be effect the life-form of culture zone.