乌鲁木齐市冬季重污染天气下PM_(2.5)中重金属污染特征及来源解析

通过乌鲁木齐市2013年2月5日至26日一次重污染天气过程中,在6个采样点位进行细颗粒物PM_(2.5)的采集,并对其中的13种重金属(Cu、Sr、Mo、Cd、Pb、V、Cr、Mn、Fe、Co、Ni、As、Hg)含量、Mull污染指数、空间分布以及溯源进行了分析。结果显示:采样期间乌鲁木齐市重金属浓度在0.23~178 ng/m~3之间,浓度水平排序PbMnCrFeAsVCuNiSrCdMoCoHg,其中Cd、Hg、Pb、Cr、As浓度均高于乌鲁木齐市背景值和国内外其他城市水平,且Mull污染指数处于较严重的污染水平;在重金属元素浓度的空间分布上,铁招和南公园点位重金属浓度较高,31中学和市监测站相对较低。

The heavy metal pollution characteristics and source apportionment of PM2.5 under the heavy pollution of urumqi winter weather

Collected fine particulate matter (PM2.5) form 6 sampling points loaded in different districts of heavy polluted Uru-mqi city during February 5 to 26 in 2013, measured each contents of 13 kinds of heavy metals (Cu, Sr, Mo, Cd, Pb, V, Cr, Mn, Fe, Co, Ni, As, Hg), analyzed the Mull pollution index , and traced spatial distribution of it .The results showed that:concentrations of heavy metals in atmosphere of Urumqi was ranged from 0.23 to 178 ng /m3 during sampling period , the con-centration level sorting as follow:Pb>Mn>Cr>Fe>As>V>Cu>Ni>Sr>Cd>Mo>Co>Hg, among them,concentra-tions of Cd, Hg, Pb, Cr, As were higher than background values in Urumqi and other cities , the Mull pollution index showed a serious contamination level;Spatial distribution of heavy metal concentration in Ron Sites and South Park location are higher than it in No .31 school and Urumqi station .