基于污染负荷指数法评价淮河(安徽段)底泥中重金属污染研究

摘要

采用电感耦合等离子体原子发射光谱法(ICP-AES)对淮河(安徽段)27个底泥样品中的重金属元素进行测试,分析了Cu,Pb,Zn,Cr,Co,V,Mn共7种元素的含量分布特征,并基于Tomlinson提出的污染负荷指数(PLI)法对重金属进行了污染评价.结果表明,淮河(安徽段)整体上受到的污染较轻微,其中只有凤台到淮南段的PLI值为1.28,属中等污染.各重金属污染程度排序为Cr＞Co＞Mn=Cu＞Pb＞Zn＞V,其中Cr的含量是背景值的6.72倍,是淮河水体(安徽段)的主要污染物,其原因可能与该地区煤矿开采和电厂的污染排放有关.%27 sediment samples of Huaihe River (Anhui Section) were collected and the contents of 7 heavy metal elements (Cu, Pb, Zn, Cr, Co, V, Mn) in the sediments were analyzed by inductively coupled plasma atomic emission spectrometry (ICP-AES). The pollution degree of heavy metals was evaluated by the method of pollution load index (PLI) proposed by Tomlinson. The results show that the Anhui Section of Huaihe River is slightly polluted on the whole, with only the stretch from Fengtai to Huainan reaching a level of moderate pollution at the PLI value of 1. 28. The degree of heavy metal pollution is in the descent order of Cr>Co>Mn=Cu>Pb>Zn>V. Among the 7 kinds of heavy metal elements, Cr is the main pollutant of Huaihe River (Anhui Section) whose concentration is 6.72 times higher than the background value. This may be due to coal mining and pollutants from the emissions of power plants in the region.