【摘要】 将五段多孔冲击分级器（粒径分级：＜１．１，１．１～２．０，２．０～３．３，３．３～７．０，＞７．０μｍ）与大流量采样器连接，于１９９６年冬夏两季采集呼和浩特市居民区、交通区、对照区（较清洁区）大气中的颗粒物，用高压液相色谱仪（ＨＰＬＣ）测定样品中的菲（ＰＨＥＮ）、蒽（ＡＮＴＨ）、芘（ＰＹＲＥ）、苯并〔ａ〕蒽（ＢａＡ），艹屈（ＣＨＲＹ）、苯并〔ａ〕芘（ＢａＰ）等六种多环芳烃化合物（ＰＡＨｓ）．数据表明：①这六种ＰＡＨｓ在颗粒物中的质量中值直径（ＭＭＤ），冬夏季均小于１μｍ；ＰＡＨｓ含量冬季平均有９８．５％，夏季有９５．５％富集在小于７μｍ的可吸入颗粒中；②以（质量／体积）浓度比较，冬季居民区、交通区、对照区的ＰＡＨｓ平均值分别高于夏季８０倍，３０倍和１８倍，呈典型的煤烟型污染的季节差异特征．三区浓度比较，冬夏季均居民区＞交通区＞对照区；③以（质量／体积）浓度累积百分数比较，三区７μｍ以下各级颗粒物中ＰＡＨｓ的富集度，冬夏季大多是交通区＞居民区＞对照区，即由于汽车尾气污染，交通区大气中的ＰＡＨｓ在小颗粒上的富集度相对更高些更多还原

【Abstract】 The atmospheric particulates were collected in the residential area and the traffic area and the control area (the better clean area) in winter and summer using a five laminated multiple divisible impacted (the diameters of particulates are as follows:<1.1,1.1￣2.0,2.0￣3.3,3.3￣7.0, >7.0 μm connected with a big flow collecting sampler.The six kinds of polycylic aromatic hydrocarbons (PAH s) in the sample,that is Phen,Anth,Pyer,BaA,Chry and BaP,were detected by using HPLC.The follow results were obtained:1.The MMDs of these six PAH s in the particulates were all less 1 μm in winter and summer.The content of PAH s enriched in particulates which the diameters were less than 7 μm and can be inhaled was aboue 98.5% in winter and 95.5% in summer.2.Comparing with the concentration in mass/volume,the mean values of PAH s in winter were 80 times in the residential area,30 thimes in the traffic area and 18 times in the control area higher than in summer respectively,which was typical character of the pollution by coal smoke in different season.Comparing the concentration these three areas,the results in winter and summer were all that the residential area >the traffic area>the control area.3.Comparing with the percentage of the cumulative concentration in mass/volume,in these three areas the enriched degree of PAH s in the particulates which the diameters were less 7 μm is all that:the traffic area>the residential area>the control area in winter and summer,that is,because of the pollution of the automobile tail gas the enriched degree of PAH s in fine particulates in the traffic area was relatively high.更多还原