Previous research in the Taihu Lake Region (TLR) of China found high levels of atmospheric organochlorine pesticides (OCPs). To understand the sources and the environmental behaviors of these OCPs in the TLR, research on air-water gas exchange was performed in 2004. Hexachlorocyclohexanes (HCHs), DDT related compounds (DDTs), cis-chlordane (CC), frans-chlordane (TC), heptachlor (HEPT), and α-endosulfan both air and water samples were analyzed, and air-water gas exchange fluxes of these compounds were calculated. The net volatilization flux of α-HCH was 58 ng m~2 day~(-1), suggesting that the residue of technical HCH in the lake sediment might have been an important source of α-HCH to the air of this region after the ban of technical HCH two decades ago. The main components of technical chlordane, TC, CC, and HEPT, each had net volatilization fluxes > 230 ng m~(-2) day~(-1), suggesting that waste discharge from manufacturing plants in the upper region was the main source of chlordane to the lake. Unlike α-HCH and chlordane, o,p'-DDT and a-endosulfan had net deposition fluxes, suggesting that these compounds were transported through the atmosphere from land sources and then deposited into the lake. The correlation between air concentrations and ambient air temperature indicated that the current sources of o,p'-DDT and α-endosulfan were from land; α-HCH and chlordane were mainly from the lake.
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机译：中国太湖地区（TLR）的先前研究发现，大气有机氯农药（OCP）含量很高。为了了解TLR中这些OCP的来源和环境行为，于2004年进行了空气-气体交换研究。六氯环己烷（HCHs），DDT相关化合物（DDT），顺式氯丹（CC），氟烷-氯丹（ TC），七氯（HEPT）和α-硫丹对空气和水样品进行了分析，并计算了这些化合物的气水交换流量。 α-六氯环己烷的净挥发通量为58 ng m〜2天〜（-1），表明湖泊沉积物中工业六氯环己烷的残留可能是该区域空气中α-六氯环己烷的重要来源。二十年前禁止使用技术六氯环己烷。工业用氯丹，TC，CC和HEPT的主要成分的净挥发分通量均大于230 ng m〜（-2）天〜（-1），表明上游地区制造工厂的废物排放是主要来源氯丹到湖里。与α-六氯环己烷和氯丹不同，邻，对'-滴滴涕和α-硫丹具有净沉积通量，这表明这些化合物从陆地源经大气传输，然后沉积到湖泊中。空气浓度与周围空气温度之间的相关性表明，o，p'-DDT和α-硫丹的当前来源均来自陆地。 α-六氯环己烷和氯丹主要来自湖泊。
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