Organochlorine pesticides in the atmosphere of Guangzhou and Hong Kong: Regional sources and long-range atmospheric transport
Organochlorine pesticides in the atmosphere of Guangzhou and Hong Kong: Regional sources and long-range atmospheric transport
复制标题
DOI：
10.1016/j.atmosenv.2006.12.052
复制
发表时间：
2007-06-01
影响因子：
5
通讯作者：
Wang, Tao
中科院分区：
文献类型：
--
作者：
Li, Jun;Zhang, Gan;Wang, Tao
2003年12月至2004年12月，在广州和香港的4个采样点测定了大气中有机氯农药（OCPs）的含量。本文研究了反式氯氰菊酯（t-CHL）、顺式氯氰菊酯（c-CHL）、p，p '-DDT、p，p'-DDE、o，p '-DDT、α-硫丹、α-和γ-六氯环己烷（HCH）等8种有机氯农药的气相和颗粒相浓度。OCPs主要存在于气相中。叔氯环己烷、氯环己烷、o，p '-滴滴涕、p，p '-滴滴涕和α-硫丹的浓度明显（p < 0.001）高于其他有机氯农药，平均值（气体+颗粒）通常在103至1440皮克米（-3）之间。总的来说，夏季的有机氯农药浓度高于冬季，但甲型六氯环乙烷的浓度没有明显的季节变化。广州发现的较高水平的γ-HCH和o，p '-DDT可归因于珠江三角洲地区目前使用的林丹和三氯杀螨醇。在所有采样点都观察到p，p '-滴滴涕和α-硫丹的浓度非常高。7天空气轨迹分析结果表明，两市夏季p，p '-DDT含量异常高，可能与该地区上风口渔船季节性使用含DDT杀虫剂有关。研究区域冬季的高浓度甲型硫丹表明，硫丹被用作棉田杀虫剂的中国东部的冬季季风进行了大气迁移。DDTs和α-硫丹的浓度和异构体比例的季节变化与冬季风和夏季风交替的一致性表明，亚洲季风在OCPs的远距离大气迁移中起着重要作用。(c)2007爱思唯尔有限公司版权所有。
Organochlorine pesticides (OCPs) were measured in the atmosphere over the period of December 2003-December 2004 at four sampling sites in Guangzhou and Hong Kong. Gas phase and particle phase concentrations of 8 OCP species, including trans-chlordane (t-CHL), cis-chlordane (c-CHL), p,p '-DDT, p,p '-DDE, o,p '-DDT, alpha-endosulfan, alpha- and gamma-hexachlorocyclohexane (HCH), were studied. OCPs were found predominantly in the gas phase in all seasons. t-CHL, c-CHL, o,p '-DDT, p,p '-DDT and alpha-endosulfan had significantly (p < 0.001) higher concentrations than other OCPs, with mean values (gas + particle) typically ranging from 103 to 1440 pg m(-3). In general, the concentrations of OCPs in summer were higher than that in winter, except for alpha-HCH which showed no clear seasonal pattern. Higher levels of gamma-HCH and o,p '-DDT found in Guangzhou could be attributed to the present usage of lindane and dicofol in the Pearl River Delta (PRD) region. The very high concentrations of p,p '-DDT and alpha-endosulfan were observed at all sampling sites. The results of 7 days air back trajectory analysis indicated that the unusual high p,p '-DDT levels in summer in both cities could be related to the seasonal usage of DDT containing antifouling paints for fishing ships in the upwind seaports of the region. The high concentrations of alpha-endosulfan in winter in the study area suggested an atmospheric transport by the winter monsoon from the East China, where endosulfan is being used as insecticide in cotton fields. The consistency of the seasonal variation of concentrations and isomeric ratios of DDTs and alpha-endosulfan with the alternation of winter monsoon and summer monsoon suggested that the Asian monsoon plays an important role in the long-range atmospheric transport of OCPs. (c) 2007 Elsevier Ltd. All rights reserved.