| This paper mainly studies 13 kinds of OCPs from TSP, through samples collection and detection from August to November in Beijing xicheng district, analyses the OCPs rule with the time and weather changing, and discusses the possible source using NOAA back trajectory and Be~7 trace. Through the opitimization of experiment design, fix on the best condition of solvet extraction, florisil cleanup and GC-ECD detection, the equipment detection limit is 2.0~6.8pg, the method detetion limit is 0.033—0.853 ng/g, and the method recoveries reach 84.26%~105.2%. HCHs, DDTs can be detected in all samples, the respective content is 7.63~19.8 pg/m~3 and 51.5~198.3 pg/m~3, the result is evidently higher than Shenzhen, Qingdao districts, and lower than Tianjin and Huhehaote. The HCHs percent contents vary greatly, show that HCHs root in distant TSP;the p,p'-DDT increases 260%, the other DDTs also rise greatly, this may be the accumulation of OCPs because a little rain at Autumn and air current from inland bases Be~7 trace. 13 OCPs commonly decrease with the temperature rising, and the humidity has no absolute effect to the content, but the pollutant exponent can preferable reveal the trend of OCPs content. The DDTs and Be~7 ratio is uniform in Beijing and Qingdao districts, but clearly under Guangzhou district, that can be primarily concluded a good approach to pursue OCPs from TSP base on Be~7 trace. |
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