Seasonal variation of organochlorine pesticides in the gaseous phase and aerosols over the East China Sea

	Seasonal variation of organochlorine pesticides in the gaseous phase and aerosols over the East China Sea
	Tianyi Ji; Tian Lin; Fengwen Wang; Yuanyuan Li; Zhigang Guo
	2015
发表期刊	Atmospheric Environment
卷号	109 期号:1 页码:31-41
摘要	Eighty paired gaseous phase and PM2.5 (particulate matter < 2.5 gm in diameter) samples, covering four seasons from October 2011 to August 2012 were collected simultaneously from a remote island in the East China Sea (ECS). The samples were analyzed for organochlorine pesticides (OCPs) to determine their seasonal variation and potential sources over the coastal marine environment. The concentrations of individual OCPs in the PM2.5 samples were higher in winter and lower in summer, and the reverse trend was observed for the measured OCP compounds (except hexachlorocyclohexanes, HCHs) in the gaseous phase. Principal component analysis revealed one trend that contributed 40% to PM2.5-bound OCPs characterized by beta-HCH, alpha-HCH, p,p'-dichlorodiphenyldichloroethane (p,p'-DDD), p,p'-dichlorodiphenyldichloroethylene (p,p'-DDE), and chlordanes; whereas two seasonal trends, represented by dichlorodiphenyltrichloroethanes (DDTs) or chlordanes and HCHs, were responsible for 38% and 23% of the gaseous OCPs, respectively. Continental outflow driven by the East Asian monsoon brought large quantities of particulate OCPs to the ECS, especially in winter. Possible fresh sources or net volatilization from the Yangtze River induced by both higher ambient temperature and higher discharge rates caused the higher gaseous DDT and chlordane levels observed in summer. However, the lower concentrations of gaseous HCHs observed in summer suggested that net volatilization had a relatively limited impact on gaseous HCHs due to the long-term prohibition of their use and their low residual levels in the catchment, whereas the elevated concentrations of gaseous HCHs in winter controlled by gas particle partitioning, resulted from increased particulate HCHs producing a partial shift to gaseous HCHs over ECS.
关键词	Ocp Gaseous Phase Aerosols Seasonal Variation Source East China Sea
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5933
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Tianyi Ji,Tian Lin,Fengwen Wang,et al. Seasonal variation of organochlorine pesticides in the gaseous phase and aerosols over the East China Sea[J]. Atmospheric Environment,2015,109(1):31-41.
APA	Tianyi Ji,Tian Lin,Fengwen Wang,Yuanyuan Li,&Zhigang Guo.(2015).Seasonal variation of organochlorine pesticides in the gaseous phase and aerosols over the East China Sea.Atmospheric Environment,109(1),31-41.
MLA	Tianyi Ji,et al."Seasonal variation of organochlorine pesticides in the gaseous phase and aerosols over the East China Sea".Atmospheric Environment 109.1(2015):31-41.

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