【摘要】 目的评价宁夏农村土壤重金属镉、铅污染状况,为镉铅污染土壤的合理利用提供依据。方法按照宁夏行政区域划分,5个地级市每市随机选取1个县(区)作为调查点,每个县(区)随机选择5个乡镇,每个乡镇随机选择8个行政村作为采样点,采集5~20 cm深表层土壤200份,对土壤镉铅含量状况进行分析,采用单项指数法和综合指数法评价农村土壤镉、铅的污染程度。结果宁夏农村土壤镉、铅含量平均值分别为0.187 mg/kg和20.76 mg/kg;宁夏农村土壤中镉超标率为3.0%,铅含量未超标;宁夏土壤镉、铅单项污染指数分别为0.625和0.069,综合污染指数1.08。结论重金属镉、铅污染评价分级结果表明,宁夏农村土壤质量整体尚好,但部分地区镉污染值得关注。更多还原

【Abstract】 Object To evaluate the heavy metal pollution of rural soil in Ningxia and provide the basis for the reasonable utlization of cadmium and lead contaminated soil. Methods According to the administrative division of Ningxia, one district was randomly selected from every prefecture-level city. Five towns were randomly selected from each district. Eight administrative villages were randomly selected from each town as sampling sites. 200 soil samples were collected and analyzed. We evaluated the degree of soil pollution with a single index and the composite index method. Results The average value of cadmium and lead contents was 0.187mg/kg and 20.76 mg/kg, respectively. The rate of exceeding standard cadmium was 3.0%, while lead content did not exceed. Single pollution indexes were respective 0.625 and 0.069, and the integrated pollution index was 1.08. Conclusion According to the grade of lead and cadmium pollution assessment, the soil quality in rural area is better, but the cadmium pollution is worth attention in some area.更多还原