北方某市环境空气颗粒物中重金属污染状况研究

对我国北方某市大气颗粒物的污染状况进行了研究。在主导风向上设置采样点,于冬季、夏季分别采集TSP、PM₁₀、PM_2.5 3种不同动力学直径的大气颗粒物。采用ICP-MS对TSP、PM₁₀、PM_2.5中的元素浓度进行分析,并对3种不同粒径颗粒物中的10种重金属采用富集因子法进行评价。结果表明,北方某市环境空气颗粒物中富集程度最严重的为Cd、Pb;在采暖期,随着颗粒物粒径变小,Pb、Cd的富集指数呈现逐渐增大的趋势;非采暖期则无此趋势。

Study on Pollution Properties of Heavy Metals in Ambient Air Particulates in a City of North China

The pollution property of atmospheric particulates in a city of north china was studied. We evaluated the pollution property of TSP, PM₁₀ and PM_2.5 in the dominant wind direction of the city in winter and summer. Ten kinds of heavy metals in TSP, PM₁₀ and PM_2.5 were evaluated by the method of index of enrichment factor. Results show that the enrichment of Cd and Pb were the most serious in ambient air particulates of the city. During heating season, with the smaller of particle size, the index of enrichment factor of Pb and Cd were increased, while in non heating season there was no such trend.