乌鲁木齐市夏季大气PM_(10)、PM_(2.5)中重金属的分布特征

利用PM2.5、PM10、TSP便携式采样器、TAS-990石墨炉原子吸收光谱仪,采集了乌鲁木齐市5个功能区大气PM10、PM2.5样品,并检测了PM10、PM2.5样品中Cd、Cr、Cu、Ni、Pb、Mn6种元素的含量。结果表明:PM10质量浓度除卡子湾水泥厂区采样期间全部超标外,其他地点均低于国家二级标准;PM2.5质量浓度与美国日均值标准相比,卡子湾水泥厂区采样期间全部超标,安宁渠良种场超标天数为20%,友好路超标天数为60%,其他地点均低于标准。富集因子法分析结果显示:乌鲁木齐市5个采样区夏季大气PM10、PM2.5中Cr、Ni、Cu、Cd、Pb5种重金属污染主要来自于人类活动,Mn则来源于地壳物质。

Characteristic of Heavy Metal Distribution in PM10 and PM2.5 from Atmospheric Samples in Urumqi in Summer

Atmospheric PM10 and PM2.5 samples from five function areas of Urumqi were collected with portable sampler for PM2.5/PM10/TSP and TAS-990 Graphite Furnace AAS,and the content of Cd,Cr,Cu,Ni,Pb,and Mn in PM2.5 and PM10 were analyzed.The result in-dicated that during the sampling period,mass concentrations of PM10 were lower than national standard level-II except in Kaziwan BayCement Works area;compared with American daily mean value standard,mass concentration of PM2.5 in Kaziwan Bay Cement Works area exceeded the allowed figure completely during the whole sampling period,Anningqu Breeding Farm exceeded the allowed figure by 20%of sampling days,Youhao Road exceeded the allowed figure by 60%of sampling days,and in the other places were lower than the allowed figure.The analysis result with enrichment factor method showed that the atmospheric pollution of heavy metals Cr,Ni,Cu,Cd and Pb in PM10 and PM2.5 from those five sampling areas in Urumqi in summer came mainly from anthropic activities and Mn originated from earth crust.