云南省沘江流域底泥中Pb污染分布特征及评价

为更好地了解沘江流域底泥中Pb的分布,以沘江流域底泥为研究对象,通过实地考察,应用统计分析等方法分析沘江流域底泥中Pb污染特征。结果表明：（1）沘江流域底泥Pb平均含量为1764.23 mg/kg;（2）底泥中Pb含量呈现上游>中游>下游趋势;（3）沘江流域底泥中Pb的单因子污染指数极高,上游、中游、下游平均单因子污染指数分别为6.04、2.51、2.03。综合分析流域底泥中Pb含量及单因子污染指数,发现沘江流域Pb污染状况严重,呈现上游>中游>下游趋势,极有可能影响沿岸农田土壤。

Pb Pollution in Sediments of the Bijiang Watershed of Yunnan: Distribution Characteristics and Evaluation

The paper aims to understand the distribution of Pb in the sediments of the Bijiang watershed, we took the sediments in the Bijiang watershed as the study object, and analyzed the Pb pollution characteristics in the sediments of the Bijiang watershed by field investigation and statistical analysis. The results showed that: (1) the average content of Pb in the sediments of the Bijiang watershed was 1764.23 mg/kg; (2) the content of Pb in sediments was upstream>midstream>downstream; (3) the single factor pollution index of Pb in the sediments of the Bijiang watershed was extremely high, and the average single factor pollution index of upstream, midstream and downstream was 6.04, 2.51 and 2.03, respectively. Based on the comprehensive analysis of Pb content and single factor pollution index in the sediments of the basin, it is found that the pollution status of Pb in the Bijiang watershed is serious, showing an upstream>midstream>downstream trend, which is likely to affect the coastal farmland soil.