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Occurrence and air-soil exchange of organochlorine pesticides and polychlorinated biphenyls at a CAWNET background site in central China: Implications for influencing factors and fate
Lingxi Zhan;  Tian Lin;  Zuwu Wang;  Zhineng Cheng;  Gan Zhang;  Xiaopu Lyu;  Hairong Cheng
2017
Source PublicationChemosphere
Volume186Pages:475-487
Abstract

Ambient air and soil samples were collected between March 2012 and March 2013 at jinsha, a regional background site in central China, to measure the concentrations of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs). The average concentrations of total OCPs and total PCBs were 191 +/- 107 and 39.4 +/- 27.1 pg/m(3) in air (gaseous and particulate phase) and 0.585 +/- 0.437 and 0.083 +/- 0.039 ng/g in soil, respectively. The higher concentrations of p,p'-dichlorodiphenyltrichloroethane (p,p'-DDT) and p,p'-DDT/p,p'-DDE ratios in the soil indicated recent p,p'-DDT input to the soil. A strong positive temperature dependence and average fugacity fraction value > 0.5 were observed for p,p'-DDT, suggesting that volatilization of residual DDT in the soil was the main influencing factor on atmospheric p,p'-DDT. Highly average fugacity fractions (>0.7) of trans-chlordane (TC) and cis-chlordane (CC) and high TC/CC ratios both in the soil and atmosphere suggested fresh inputs. Higher gaseous concentrations of hexachlorobenzene (HCB) were observed in winter and negative temperature dependence was directly attributed to the surrounding ongoing source (e.g. fuel consuming activities), especially in winter. Overall, most targeted OCP5 and PCBs were influenced by long-range transport, and fugacity fraction values indicated highly volatile compounds (e.g. alpha-hexachlorocyclohexane (alpha-HCH) and lower chlorinated PCBs) were volatilized and low volatility compounds (e.g. p,p'-DDE and higher chlorinated PCBs) were deposited at the air soil interface. Knowing the source and sink of OCPs and PCBs can help to control their pollution in this area and provide a reference for other studies. 

KeywordOcps Pcbs Seasonal Variation Airesoil Exchange Cawnet Backg Central China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8024
Collection环境地球化学国家重点实验室
Affiliation1.Department of Environmental Engineering, School of Resource and Environmental Science, Wuhan University, Wuhan, 430079, China
2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, China
3.State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
Recommended Citation
GB/T 7714
Lingxi Zhan;Tian Lin;Zuwu Wang;Zhineng Cheng;Gan Zhang;Xiaopu Lyu;Hairong Cheng. Occurrence and air-soil exchange of organochlorine pesticides and polychlorinated biphenyls at a CAWNET background site in central China: Implications for influencing factors and fate[J]. Chemosphere,2017,186:475-487.
APA Lingxi Zhan;Tian Lin;Zuwu Wang;Zhineng Cheng;Gan Zhang;Xiaopu Lyu;Hairong Cheng.(2017).Occurrence and air-soil exchange of organochlorine pesticides and polychlorinated biphenyls at a CAWNET background site in central China: Implications for influencing factors and fate.Chemosphere,186,475-487.
MLA Lingxi Zhan;Tian Lin;Zuwu Wang;Zhineng Cheng;Gan Zhang;Xiaopu Lyu;Hairong Cheng."Occurrence and air-soil exchange of organochlorine pesticides and polychlorinated biphenyls at a CAWNET background site in central China: Implications for influencing factors and fate".Chemosphere 186(2017):475-487.
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