为了研究持久性有机污染物(POPs)的区域分布、大气传输与来源,2006年7月至2008年6月在天津市的6个点位用被动采样技术采集大气样品.色谱/高分辨质谱(GC/HRMS)分析数据表明,HCB、HCHs和DDTs大气浓度点位差异较大;有机氯污染物的相对化学组成具有鲜明的季节变化特征;不同功能区的大气样品主要按照季节聚类,而不是按照功能区划聚类,表现出有机氯污染较强的区域性特征,即同一区域各点位相对组成的相似性突出;体现了有机氯污染物大气传输的能力和影响.大气被动采样技术能够同时提供工业区较高浓度和远郊区较低浓度的有机氯污染物大气浓度水平和时空分布的数据.%To investigate regional distribution, atmospheric transportation and sources of persistent organic pollutants (POPs), a passive air sampling campaign was carried out from July 2006 to June 2008 at six sites in Tianjin. Based on GC/HRMS analytical data, it was revealed that air concentrations of HCB, HCHs, and DDTs varied substantially over sites;the relative compositions of organochlorine pollutants had clear seasonal variations; passive air samples were classified according to seasons rather than their site functionalities in cluster analysis; it implied a strong regional similarity of relative compositions of organochlorine pollutants among sites in Tianjin, due to the impact of atmospheric transportation. The passive air sampling technique is able to provide data of air concentration levels and spatial and temporal distributions for organochlorine pollutants at both industrious sites as well as clean rural sites.
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