Inorganic chemical composition and source signature of PM2.5 in Beijing during ACE-Asia period
Inorganic chemical composition and source signature of PM2.5 in Beijing during ACE-Asia period
复制标题
DOI：
10.1007/bf03184216
复制
发表时间：
2003-05
影响因子：
--
通讯作者：
Renjian Zhang;Yongfu Xu;Z. Han
中科院分区：
文献类型：
--
作者：
Renjian Zhang;Yongfu Xu;Z. Han
2001年3月至4月，使用IMPROVE采样器在北京连续38天采集了大气颗粒物PM2.5样品。采用PIXE方法测定了PM2.5中w 0元素的浓度。结果表明，监测期间矿尘PM2.5平均浓度为14.6 μg/m3。3月21日和4月10日沙尘日，沙尘PM2.5质量浓度分别为62.4和54.1 μg/m3。说明北京市沙尘天气造成的细颗粒物污染非常严重。S和Cu的富集因子在沙尘日达到最小值，在非沙尘日达到最大值。认为PM2.5中与人类活动有关的元素富集因子可能是区分沙尘本地源和外来源的有效方法。对PM2.5化学成分的因子分析表明，地壳物质、人为排放和石油燃烧对2001年春季北京市空气中PM2.5浓度有贡献。
Aerosol samples for PM2.5were collected in Beijing for 38 consecutive days from March to April 2001 using an IMPROVE Sampler. Concentrations of w0 elements in PM2.5were determined using a PIXE method. Results show that he average mineral dust concentration of PM2.5was 14.6 μg/m3during the observation period. On the sanddust event days of March 21 and April 10, dust PM2.5mass concentrations were 62.4 and 54.1 μg/m3, respectively. These demonstrate that fine particle pollution by dust event in Beijing was very severe. The enrichment factors of S and Cu reached minimums on the dusty days and were high on the non-dusty days. It is considered that enrichment factors of elements in PM2.5, which are associated with human activities, can probably provide an effective method to distinguish local sources from external sources of dust. Factor analysis on the chemical composition in PM2.5shows that sources of crustal matters, anthropogenic emission, and oil combustion contributed to PM2.5levels in air in the springtime of 2001 in Beijing.