汀江某河段底泥中重金属含量的测定及生态风险评价

Determination of heavy metal contents and evaluation of the ecological risk of the sediments of Tingjiang River

采用ICP-MS法测定汀江某河段底泥样品中重金属的含量,了解该地区13种元素的分布特征,通过地积累指数法和潜在生态危害指数法对底泥重金属污染进行综合评价.结果表明,用ICP-MS测定重金属快速、简便、结果准确,地积累指数法得出13种元素污染程度由强至弱依次为Cd>Cu>As>Se>U>Co=Zn>Pb>Mn>Th>Ni=Tl>Cr,生态危害指数法得出6种重金属对样品所在区域造成的潜在生态危害,由强到弱依次为Cd>Cu>As>Pb>Zn>Cr,Cd、Cu和As为该地区的主要污染因子.其中3#点位RI值为1283,提示生态危害程度很强、污染程度最高,2#点位其次,1#点位也存在一定污染.

The contents of the heavy metals in the sediment samples of Tingjiang river were determinated by ICP-MS to investigate the distribution of 13 elements.The Index of Geoaccumulation and the Potential Ecological Risk Index were employed to evaluate the pollution degree of heavy metals in the sediments.The results indicate that ICP-MS was rapid,simple and accurate for determining the heavy metal elements.The descending order of pollution degree of various metals was Cd〉Cu〉As〉Se〉U〉Co=Zn〉Pb〉Mn〉Th〉Ni=Tl〉Cr by the Index of Geoaccumulation.And similarly the potential ecological risk intensity caused by 6 different metals was Cd〉Cu〉As〉Pb〉Zn〉Cr.Cd,Cu and As were the main factors.The RI value of 3# was 1283,which suggested that the ecological risk and the pollution was the worst,followed by 2#,and 1# was also polluted.