乐安河沉积物重金属污染现状评价

通过2003年对乐安河沿线12个采样点的沉积物重金属含量检测,采用污染综合指数法(P)、地积累指数法(Igeo)以及潜在生态危害指数法(RI)分别评价其污染水平,结果表明,乐安河沉积物重金属污染严重,根据Igeo,污染水平上游段Cu>Pb>Zn,中游段三者相当,下游段Pb>Zn>Cu,根据RI把乐安河沿线分为源头低生态风险型,上游单一金属高生态风险突出型,中下游多金属高生态风险综合型三种,三种评价方法反应的总体趋势一致,但也有不同之处,应用过程中宜将三种方法相结合综合进行评价。

Current Assessment on Heavy Metal Pollution in the Sediment of Le'an River

According to the concentration of heavy metals in each sampling site in 2003,methods of composite pollution index,index of geoaccumulation and potentional ecological risk index were used to evaluate heavy metal pollution.Results indicated that Le’an River has been polluted by heavy metals seriously,with the order of heavy metals,from highest to lowest pollution degree with Igeo value as Cu> Pb>Zn for the upriver;the same state in the middle of the river;Pb> Zn> Cu for the downriver.The distribution of pollutants in the River sediments were divided into three sections with different ecological risk characteristics on the whole,lower ecological risk area in headstream;single metal high ecological risk area and multi-metal high ecological risk area.Three methods can reflect the same change trend along the River,although there were some difference,they could complement each other.