青岛潮间带表层沉积物重金属污染现状及潜在生态风险评价

Pollution status and potential ecological risk assessment of heavy metals in the surface sediments of Qingdao intertidal zone

为探究青岛旅游热点区域潮间带表层沉积物重金属污染情况,测定了该区域表层沉积物重金属Cu、Pb、Cd、Zn、Cr、Hg及As的含量,并开展了污染现状及潜在生态危害评价。结果表明:潮间带表层沉积物中As满足《海洋沉积物质量》(GB 18668—2002)二类沉积物标准,其他重金属满足GB 18668—2002一类沉积物标准;与其他区域相比,青岛潮间带沉积物中除As含量偏高外,其他重金属总体处于较低水平;各采样点尼梅罗综合污染指数排序为太平角>青岛湾>团岛湾>浮山湾>汇泉湾>石老人>雕塑园,其中汇泉湾、石老人、雕塑园为轻度污染,太平角、青岛湾、团岛湾、浮山湾为中度污染;青岛潮间带沉积物重金属潜在生态危害处于低度或中度水平,具有从低度向中度发展的趋势;7种重金属中,Pb、As、Hg的地累积指数平均值超过0,需要引起关注。

In order to explore the heavy metal pollution in the surface sediments of intertidal zone in Qingdao tourist hot spots,this study measured the contents of heavy metals Cu,Pb,Cd,Zn,Cr,Hg and As in the surface sediment limit of study area,and further carried out the present pollution situation and potential ecological risk assessment.The results showed that the content of As met the second class sediment limits of“Marine sediment quality”(GB 18668-2002),and other heavy metals met the first class sediment limits of GB 18668-2002.Except that the content of As was higher,the contents of other heavy metals in Qingdao intertidal zone were at a lower level compared with other regions.Nemerow synthetical pollution index of research regions were followed the order of Taipingjiao>Qingdao Bay>Tuandao Bay>Fushan Bay>Huiquan Bay>Shilaoren>Diaosuyuan,among these sampling sites,Huiquan Bay,Shilaoren,Diaosuyuan were slighted polluted,while Taipingjiao,Qingdao Bay,Tuandao Bay and Fushan Bay were moderately polluted;the potential ecological risk degree of Qingdao intertidal zone was in moderate or low level,and had the tendency of developing from low to moderate.Among the seven heavy metals,Pb,As,Hg had the average geoaccumulation index of more than 0,which should be paid more attention to.