利用PUF被动采样装置,对珠江三角洲地区大气中有机氯农药(OCPs)进行监测.结果显示,广东省大气中有机氯农药主要是滴滴涕(DDTs)、六六六(HCH)及氯丹(Chlordane),其中DDTs约占总OCPs的54.5%;香港大气中农药残留主要是氯丹和DDTs,氯丹约占总含量的51.3%.珠三角地区大气中有机氯农药空间分布差异明显(580-5500pg·m^-3),香港平均浓度远远低于广东省.另外,广东省仍有工业DDT在使用,造成广东省大气中有“新”的工业DDT输入;而三氯杀螨醇是香港大气中DDT高含量的重要来源;广东省和香港HCH主要源于林丹使用的残留,香港的Eastern及Tsuen Wan源于工业六六六使用的残留;珠江三角洲所有采样点的HCB含量较低,大气中HCB少量残留可能是HCB作为药物中间体的化学合成及HCB在大气中长距离传输的结果.
This was achieved using a PUF passive air sampling system, based on the Guangdong province and Hong Kong in Pear river delta (PRD) between Aug. 15 and Oct. 14, 2005. The results showed residues of OCPs are DDTs(54. 5% ) , HCH and chlordane in Guangdong province, Residues of OCPs are chlordane(51.3% ) and DDTs in HK. Using the comparison of isomer and content of compounds bring forward origin of higher residues of OCPs in PRD. Dicofol and tech-DDT is source of higher concentration of DDTs in HK. Source of HCH is usage of hexachloro-cyclohexane in PRD and technique-666 in HK. Concentration of HCB is low in PRD. Residues of HCB in air is from agriculture production and chemosynthesis.