乌鲁木齐市大气PM2.5中重金属元素含量和富集特征

利用PM2.5／PM10便携式采样器采集了乌鲁木齐市5个功能区PM2.5，样品，用TAS-990石墨炉原子吸收光谱仪检测了PM2.5样品中Cd、Cu、Ni、Pb、Mn的含量。结果表明，乌鲁木齐大气PM2.5质量浓度变化趋势是冬季采暖盛期〉秋季采暖初期〉春季停暖初期〉夏季停暖期。参照《环境空气质量标准》（GB3095—2012）中的二级标准，采样期间卡子湾水泥厂区样品全部超标，其余4个采样点样品在冬季采暖盛期也全部超标，部分样品在非采暖期超标。富集因子法分析表明，乌鲁木齐市5个采样区PM2.5样品中Ni、Cu、Cd、Pb污染主要来自于人类活动，Mn则来源于地壳物质。

Concentration and Enrichment Characteristic of Heavy Metal Elements in PM2.5 of Urumqi

PM2.5 samples from five functional areas in Urumqi were collected with PM2.5/PM10 portable sam- piers and Cd, Cu, Ni, Pb and Mn element concentrations were tested by TAS-990 graphite atomic absorption spec- trometer. Result showed variation trend of PM2.s concentration in Urumqi was heating period in winter 〉 early heating period in autumn 〉 early non-heating period in spring 〉 non-heating period in summer. Referring to the China National Standard ＂ Ambient air quality standards GB 3095-2012＂ Level Ⅱ ,the PM2.5 concentration in Ka- ziwan Cement Plant area exceeded the permissible limit during the whole sampling period,and in the other four sampling sites all exceeded the standard during the heating period in winter, and partially exceeded the standard during non-heating period. The analytical result of enrichment factor method showed that the heavy metal air pol- lution with Ni,Cu,Cd and Pb in PMz.5 from those five sampling areas in Urumqi mainly come from human activi- ties and Mn originated from crust matters of the earth.