Seasonal trend of ambient PCDD/Fs in Tianjin City, northern China using active sampling strategy

查看全文 作　　者：Lei [1]Ding;Yingming [1]Li;Pu [1]Wang;Xiaomin [1]Li;Zongshan [1]Zhao;Qinghua [1]Zhang;Ting [1]Tuan;Guibin [1]Jiang

机构地区：[1]State Key Laboratory of Environmental Chemistry and Ecotoxicology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China

出　　处：《Journal of Environmental Sciences》索引2012年第24卷第11期,共6页

基　　金：supported by the Ministry of Environmental Protection of China for the Project of Toxic Substances in the Atmosphere and Their Effect to the Soil;the National Basic Research Program (973) of China(No.2009CB421600);the National Natural Science Foundation of China (No.20897011, 20907059) 摘　　要：The spatial concentrations, seasonal trends, profiles and congener pairs of ambient polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) were investigated within a seasonally active sampling scheme during Jun 2008 and Jan 2009 in Tianjin City, northern China. The PCDD/F concentrations ranged 14.2-172 fg I-TEQ/m3 (average 69.3 fg I-TEQ/m3 ) in summer and (89.8-1.01)×103 fg I-TEQ/m3 (average 509 fg I-TEQ/m3 ) in winter, respectively, except for the E-waste dismantling site where much higher values were observed (1.04×103 fg I-TEQ/m3 in summer and 7.123×103 fg I-TEQ/m3 in winter). The results indicated a significantly seasonal trend with higher TEQ values in winter as compared with summer, which could be related to increased emission sources and seasonal variations of the atmospheric boundary layer height. 2,3,4,7,8-PeCDF was the dominant contributor to the total PCDD/F toxic equivalents, and 2,3,7,8-TCDD was detected at almost all the sampling sites in winter. Most of the similarly substituted PCDD/F congener pairs exhibited high correlations, suggesting that they might have similar environmental fate or sources. But different seasonal and spatial distributions of PCDD/F concentrations indicated that the emission sources might be intermittent. 关键词：PCDDS 中国北方地区采样策略季节性环境天津多氯二苯并呋喃浓度范围

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Seasonal trend of ambient PCDD/Fs in Tianjin City, northern China using active sampling strategy

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