title: Air-soil exchange of organochlorine pesticides in a sealed chamber.
abstract: So far little is known about air-soil exchange under any sealed circumstances (e.g., in plastic and glass sheds), which however has huge implications for the soil-air-plant pathways of persistent organic pollutants including organochlorine pesticides (OCPs). A newly designed passive air sampler was tested in a sealed chamber for measuring the vertical concentration profiles of gaseous phase OCPs (hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs)). Air was sampled at 5, 15, and 30 cm above ground level every 10th day during a 60-day period by deploying polyurethane foam cylinders housed in acrylonitrile butadiene styrene-covered cartridges. Concentrations and compositions of OCPs along the vertical sections indicated a clear relationship with proximity to the mixture of HCHs and DDTs which escapes from the soils. In addition, significant positive correlations were found between air temperatures and concentrations of HCHs and DDTs. These results indicated revolatilization and re-deposition being at or close to dynamic pseudo-equilibrium with the overlying air. The sampler used for addressing air-soil exchange of persistent organic pollutants in any sealed conditions is discussed.
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address: yangbing@craes.org.cn.
authors.forename: Bing
authors.initials: B
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Department of Environment and Recourses, Hunan Agricultural University, Changsha 410128, China.
authors.forename: Baolu
authors.initials: B
authors.lastname: Han
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China. Electronic address: ndxue2013@gmail.com.
authors.forename: Nandong
authors.initials: N
authors.lastname: Xue
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
authors.forename: Lingli
authors.initials: L
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
authors.forename: Fasheng
authors.initials: F
authors.lastname: Li
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D003634:DDT / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods; D001556:Hexachlorocyclohexane / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D013696:Temperature
chemical_list: D000393:Air Pollutants; D010575:Pesticides; D012989:Soil Pollutants; D001556:Hexachlorocyclohexane; D003634:DDT
keywords: Air–soil exchange; Chamber; Organochlorine pesticides; Passive air sampler