郑州市大气PM_(2.5)的污染特征及源解析

Pollution Characteristics and Source Apportionment of PM_(2. 5) of Ambient Air in Zhengzhou

为全面解析郑州市环境空气PM2.5的化学特征及来源,按照城市功能分区的差异,在郑州市沿主导风向选择4个监测点位,采用大流量采样器分别在采暖季和非采暖季采集40个PM2.5样品。监测数据表明,郑州市环境空气PM2.5在采暖季和非采暖季的浓度范围均值高达197、173μg/m3,已属于严重污染;PM2.5成分分析结果表明,Zn、Pb、Cu、Mn等是PM2.5中的主要污染元素,其富集系数分别为110、94.9、10.9和5.0;主成分分析结果表明,建筑扬尘、土壤尘及道路扬尘、汽车尾气、煤炭燃烧是郑州市PM2.5的主要来源,其累计贡献率超过90%。

In order to fully understand the chemical characteristics and source of PM2.5 in ambient air of Zhengzhou,we selected four monitoring sites along the dominant wind direction by the differences of city functional zone.40 PM2.5 samples were collected during the heating season and non-heating season using large volume samplers.Monitoring data shows that the ambient air of Zhengzhou were polluted seriously in heating season and non-heating season,the concentration is up to 197 and 173 μg/m3 respectively.Zn,Pb,Cu,Mn,etc.were the main pollution elements,the enrichment coefficients were 110,94.9,10.9 and 5.0 respectively.Building dust,soil dust and road dust,vehicle exhaust,coal combustion were the main sources of PM2.5 in Zhengzhou,the cumulative contribution rate was over 90％.