Air–Water Gas Exchange of Organochlorine Pesticides in Taihu Lake, China
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- 作者：Xinghua Qiu ; Tong Zhu ; Feng Wang ; Jianxin Hu
- 刊名：Environmental Science & Technology
- 出版年：2008
- 出版时间：March 15, 2008
- 年：2008
- 卷：42
- 期：6
- 页码：1928 - 1932
- 全文大小：156K
- 年卷期：v.42,no.6(March 15, 2008)
- ISSN：1520-5851
文摘
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), trans-chlordane (TC), heptachlor (HEPT), and α-endosulfan in 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 α-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.