徐州市农村水环境现状及风险评价

A study on the status quo of water environmental quality and the risk assessment in rural areas of Xuzhou City

为了解徐州市农村地表水污染现状,选取市区周边8个具有代表性行政村,近五年来检出率较高的20种污染因子进行监测,利用单因子指数和内梅罗综合污染指数法对其进行分析,并对其环境风险进行了评价。结果表明,所选取的8个采样点耗氧量、氨氮、总氮、总磷、邻苯二甲酸酯类指标超标严重,重金属污染特征不明显;该市农村地表水总体处于中度和重度污染水平,对该地的地下水、农作物、土壤均存在环境风险。

In order to understand the status quo of surface water pollution in rural areas of Xuzhou,eight representative villages were selected to monitor 20 pollutants with high detection rate in the past five years. The single factor index and the Nemerow pollution index method were used to analyze and evaluate the environmental risk. The results showed that COD,BOD,NH_3- N,TN,TP and phthalic acid ester greatly exceeded the relevant standards for samples in 8 sampling points selected,while the heavy metals pollution was not significant. Generally,surface water in rural areas of the city is at medium and severe pollution levels,posing environmental risks to the ground water,crops and soil in the areas.