Distribution, regional sources and deposition fluxes of organochlorine pesticides in precipitation in Guangzhou, South China
Distribution, regional sources and deposition fluxes of organochlorine pesticides in precipitation in Guangzhou, South China
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DOI：
10.1016/j.atmosres.2010.03.013
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发表时间：
2010-07
影响因子：
5.5
通讯作者：
De-yin Huang;P. Peng;Yigang Xu;Cui-xiang Sun;Hongmei Deng;Yunyun Deng
中科院分区：
文献类型：
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作者：
De-yin Huang;P. Peng;Yigang Xu;Cui-xiang Sun;Hongmei Deng;Yunyun Deng
通过对2005年3 - 8月广州地区多个站点收集的雨水进行分析，探讨了华南地区有机氯农药（OCPs）的分布、区域来源和沉降通量。共检出六氯环己烷（HCHs）、二氯二苯三氯乙烷（DDTs）、硫丹等8种有机氯农药。在监测期间，体积加权的月平均总浓度变化范围为3.65±0.95 ~ 9.37±2.63ngL−1，估计的总湿沉积通量约为11.43±3.27µgm−2。农药主要在溶解相检测。3月和4月颗粒相和溶解相的分布系数普遍高于其他月份。降水中的HCHs， p，p′-DDD和p，p′-DDT与珠江三角洲地区杀虫剂残留和使用现状有关。4 ~ 8月p、p′-DDD+p、p′-DDT浓度较高，与南海港口渔船夏季使用含DDT防污漆有关。3月份硫丹含量相对较高，与亚洲冬季风从中国东部棉田向大气输送硫丹有关。硫丹、p，p′-DDD和p，p′-DDT浓度随冬夏风变化的一致性表明，亚洲季风在ocp的远距离输送中起着重要作用。此外，OCPs的湿沉降不仅会影响珠江水体，还会影响广州地区地表农药的分布，尤其是硫丹、p，p ' -DDD和p，p ' -DDT。
We analyzed rainwater collected from multiple sites, Guangzhou, China, from March to August 2005, with the aim to characterize the distribution, regional sources and deposition fluxes of organochlorine pesticides (OCPs) in South China. Eight species of organochlorine pesticide were detected, including hexachlorocyclohexanes (HCHs), dichlorodiphenyltrichloroethanes (DDTs), and endosulfans. Volume-weighted mean monthly total concentrations varied from 3.65±0.95 to 9.37±2.63ngL−1, and the estimated total wet deposition flux was about 11.43±3.27µgm−2during the monitoring period. Pesticides were mainly detected in the dissolved phase. Distribution coefficients between particulate and dissolved phases in March and April were generally higher than in other months. HCHs, p,p′-DDD and p,p′-DDT in precipitation were attributed to both the residues and present usage of insecticides in Pearl River Delta. The concentrations of p,p′-DDD+p,p′-DDT were relatively high from April to August, which were related to the usage of antifouling paints containing DDT for fishing ships in seaports of the South China Sea in summer. In contrast, endosulfans were relatively high in March, which was related to their seasonal atmospheric transport from cotton fields in eastern China by the Asian winter monsoon. The consistency of the variation of endosulfans, p,p′-DDD and p,p′-DDT concentrations with the alternation of summer and winter monsoon suggested that the Asian monsoon played an important role in the long-range transport of OCPs. In addition, the wet deposition of OCPs may influence not only Pearl River water but also the surface land distributions of pesticides in the Guangzhou area, especially for endosulfans, p,p′-DDD and p,p′-DDT.