通过实验研究的方法对南京城区不同位置路面沉积物的粗径以及其中重金属铅的含量进行了分析,结果表明,不同地区道路沉积物中拉径在0.1～ 0.25 mm的沉积物中铅的含量最高,沉积物中重金属铅的质量比在酸洗条件下为6.35～151.41 mg/kg,消解条件下为7.04～277.85 mg/kg,在中性水浸泡条件下未有铅检出,沉积物中铅的含量与沉积物的粒径有较大的关系,并且遵循拉径越小铅含量越高的规律.与国内其他城市路面沉积物中铅污染的研究结果相比,南京城区的路面沉积物铅污染程度中等.%The grain size distribution and lead content of the road deposited sediments from various functional areas in Nanjing were analyzed. The lead content was measured by atomic absorption spectrophotometer through three methods, that is, water leaching, pickling and digestion. Results showed that the lead content in the road deposited sediment ranging from 0.1 to 0.25 mm in size was the highest. The lead content was 6.35 to 151.41 mg/kg in pickling condition, and 7.04 to 277.85 mg/kg in digestion condition, and there was no lead can be detected in water leaching condition. The contents of lead in the road deposited sediments greatly related to the grain size. The smaller the grain, the higher the content of lead is. Compared with the research results of other cities, the degree of lead pollution in Nanjing was medium.
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