乌鲁木齐市大气PM10中重金属元素的浓度和富集特征

利用PM2.5,PM10便携式采样器、TAS-990石墨炉原子吸收光谱仪,采集了乌鲁木齐市五个功能区大气PM10样品,并检测了PM10样品中Cd、Cu、Ni、Pb、Mn五种元素的含量.结果表明:乌鲁木齐大气PM10浓度变化趋势是冬季＞秋季＞春季＞夏季.采样期间,卡子湾水泥厂区全部超过国家环境空气质量二级标准(150 μg/m3),其余四个采样点在冬季也全部超标.Pb、Cu、Cd、Mn四种元素浓度在秋、冬两季大于春、夏两季;Ni的浓度在春、夏两季大于秋、冬两季.Pb、Ni、Cu、Cd四种重金属富集因子基本大于10,说明这几种重金属元素的富集与人类活动有关,Mn则主要是来自于地壳物质.

Concentration and Enrichment Characteristic of Heavy Metal Elements in Urumqi Atmospheric PM10

With PM2.5/PM10 portable sampler and TAS-990 graphite-oven atomic absorption spectrometer,the PM10 atmospheric samples were collected from five functional areas in Urumqi city,and the contents of five elements Cd,Cu,Ni,Pb and Mn were inspected.The result shows the variation trend of PM10 in Urumqi atmosphere is winter > autumn > spring >summer.During the sampling period,the atmospheric quality in Qiaziwan Cement Works area was worse than national class II(150 μg/m3),and the other four sampling points all exceeded the standard during winter,and partially exceeded the standard during three seasons.The concentration of four elements Pb,Cu,Cd and Mn was higher obviously in autumn and winter than in spring and summer;the concentration of Ni was higher in spring and summer than in autumn and winter.The enrichment factor of four heavy metals Pb,Ni, Cu and Cd was over 10 mainly,which illustrated that the enrichment of those heavy metal elements relates to anthropic activities,and Mn comes mainly from earth's crust.