为了解唐山市大气气溶胶中有机物的污染现状，于2010年9月—2011年8月利用安德森8级撞击采样器在河北省唐山市采集了大气颗粒物样品，采用GC／MS法对细粒子（ PM2．1）和粗粒子（ PM＞2．1）中的19种（C14—C32）正构烷烃进行了定量分析．结果表明，PM2．1和PM＞2．1中正构烷烃年均浓度分别为632．6 ng·m－3和445．6 ng·m－3，主要富集在细粒子中，质量浓度季节变化规律为冬＞春＞秋＞夏；细粒子中，春、夏、秋、冬主峰碳（ Cmax）分别为C29、C27、C21和C21；粗粒子中，春、夏、秋、冬Cmax分别为C31、C27、C22和C22，粗细粒子中碳优势指数（ CPI）在1左右，说明唐山地区正构烷烃的污染主要受人为源影响很大．粗细粒子植物蜡贡献率分别为2．19％—57．62％和0．83％—49．87％，夏季植物蜡分布值最大，冬季最小，表明夏季植物源对正构烷烃的贡献相对较大，冬季正构烷烃的排放主要来源于人为活动（汽车尾气、化石燃料燃烧等），植物源贡献相对较少．
To understand the pollution level of organic aerosol in Tangshan, Hebei province, atmospheric particle matter was collected by using Anderson air sampler from September, 2010 to August, 2011. The concentration of 19 n?alkanes ( C14—C32 ) were determined in fine particle ( PM2.1 ) and coarse particle ( PM>2.1 ) via GC?MS. The results showed that annual average concentration of n?alkanes in fine and coarse particles were 632. 6 ng·m-3 and 445. 6 ng·m-3 , respectively. N?alkanes were mostly enriched in fine particles. There was obvious seasonal variation of n?alkanes:winter> spring >autumn> summer. In fine particles carbon number maximun ( Cmax) were C29, C27, C21 and C21 in spring, summer, autumn and winter, respectively. And Cmax were C31, C27, C22 and C22 in coarse particles. The CPI of coarse particle and fine particle was about 1, indicating that the pollution of n?alkanes in Tangshan was mainly affected by anthropogenic source. And the value of the contribution of biogenic wax n?alkanes (%wax) were 2.19%—57.62%and 0.83%—49.87%, respectively. The highest was in summer and the lowest in winter. It could be concluded that the contribution of biological source to n?alkanes in summer was relatively larger than winter which was affected by anthropogenic activities ( vehiculae exhaust emission, fossil fuel combustion) seriously.
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