韶关北江河沉积物重金属污染调查与评价

The Survey and Evaluation on River Sediments Heavy Metal Pollution in Beijiang River Basin of Shaoguan Section

通过对北江流域韶关段底积物进行取样,采用原子分光光度法检测了Cr、Pb、Cd、As 4种重金属的含量,并分析了4种重金属空间分布的特征。运用土壤污染累积指数法和内梅罗污染指数法对重金属环境污染的程度进行了评价。结果表明,重金属的污染程度在不同的地点存在明星差异,随着土壤深度的增加重金属含量明显降低,具有明显的表层富集的特点。研究区中,污染最严重的重金属是镉,其次是砷和铅,三者均达到严重污染等级,而铬也达到了轻度污染。因此,北江河流域韶关段河流已经受到了严重的重金属污染,环境治理刻不容缓。

Through bottom sediments sampling in the Beijiang river basin of Shaoguan,and using atomic spectrophotometry to detect content of the Cr,Pb,Cd,As,and analyzes characteristics of spatial distribution of the four heavy metals. The accumulated soil pollution index method and Nemerow integrated contamination index were applied to evaluated the degree of heavy metal pollution of the environment. Results show that the pollution degree of heavy metals in different locations is differences,heavy metal content decrease obviously with the increase of depth of soil,has the obvious characteristics of surface enrichment. In the study area,cadmium is the most polluted heavy metal,followed by arsenic and lead,which all serious pollution grades,and chromium have reached the light pollution. Therefore,in the Beijiang river basin of shaoguan section has suffered serious pollution of heavy metals,so it is urgent to environmental governance.