Levels, seasonal variations and sources of organochlorine pesticides in ambient air of Guangzhou, China
Levels, seasonal variations and sources of organochlorine pesticides in ambient air of Guangzhou, China
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DOI：
10.1016/j.atmosenv.2007.09.061
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发表时间：
2008-02-01
影响因子：
5
通讯作者：
Mu, Dehai
中科院分区：
文献类型：
--
作者：
Yang, Yunyun;Li, Deliang;Mu, Dehai
于2005年4月至2006年3月在广州市城区和郊区采集空气样品，测定环境空气中有机氯农药（OCPs）的浓度，并研究其季节变化和来源。空气中六氯环己烷、三氯甲烷和滴滴涕的平均浓度在市区分别为93、287和351皮克米（-3），在郊区分别为94、2258和399皮克米（-3）。本研究中，空气中的OCPs主要以气相存在，但其颗粒相浓度仍不可忽略。城市和郊区大气中六氯环己烷和滴滴涕的浓度和季节变化规律相似，无明显差异。两个采样点大气中Sigma chlorophyll浓度的季节变化差异很大，郊区采样点空气中Sigma chlorophyll浓度异常高，尤其是2005年4月和5月。由于广州空气中甲型六氯环己烷/γ-六氯环己烷的比例相对较低，因此广州空气中六氯环己烷的潜在来源可能来自林丹。特别是在郊区或其附近，可能使用了工业级氯丹，因为t-氯丹/c-氯丹的比率> 1.2，空气中氯丹的浓度极高。DDT/（DDE+DDD）和o，p '-DDT/p，p'-DDT的比值较高，说明珠江三角洲及其附近地区目前使用三氯杀螨醇。空气中奥尔德里奇的浓度很低，没有一个样品中检测到狄氏剂和异狄氏剂。(C)2007爱思唯尔有限公司版权所有。
Air samples were collected at an urban site and a suburban site of Guangzhou city, China, from April 2005 to March 2006, to measure concentrations of organochlorine pesticides (OCPs) in the ambient air and study their seasonal variations and sources. The average concentrations of Sigma HCHs, Sigma chlordane and Sigma DDTs in the air were 93, 287 and 351 pg m(-3) at the urban site, and 94, 2258 and 399 pg m(-3) at the suburban site, respectively. OCPs in the air were predominantly in gas phase in this study but their concentrations in particle phase were still not neglectable. The air concentrations and seasonal variations of Sigma HCHs and Sigma DDTs at the urban and suburban sites were similar without obvious difference. The seasonal variations of Sigma chlordane concentrations were extremely different at the two sampling sites and the air concentrations were unusually high at suburban site, especially in April and May 2005. The potential sources of HCHs in the air of Guangzhou might come from lindane due to the relative low alpha-HCH/gamma-HCH ratios. Technical chlordane was likely used, especially at or near the suburban site, because the t-chlordane/c-chlordane ratios were > 1.2 and the air concentrations of chlordane were extremely high. Present usage of dicofol at or near Pearl River Delta (PRD) region was implied by the much higher ratios of DDT/(DDE+DDD) and o,p'-DDT/p,p'-DDT. The air concentrations of aldrich were low, and dieldrin and endrin were detected in none of the samples. (C) 2007 Elsevier Ltd. All rights reserved.