Assessing Environmental Fate of 尾-HCH in Asian Soil and Association with Environmental Factors

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• 作者：Yue Xu ; Chongguo Tian ; Jianmin Ma ; Gan Zhang ; Yi-Fan Li ; Lili Ming ; Jun Li ; Yingjun Chen ; Jianhui Tang
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：September 4, 2012
• 年：2012
• 卷：46
• 期：17
• 页码：9525-9532
• 全文大小：472K
• 年卷期：v.46,no.17(September 4, 2012)
• ISSN：1520-5851

文摘

Chinese Gridded Pesticide Emission and Residue Model was applied to simulate long-term environmental fate of 尾-HCH in Asia spanning 1948鈥?009. The model captured well the spatiotemporal variation of 尾-HCH soil concentrations across the model domain. 尾-HCH use in different areas within the model domain was simulated respectively to assess the influence of the different sources of 尾-HCH on its environment fate. A mass center of soil residue (MCSR) was introduced and used to explore environmental factors contributing to the spatiotemporal variation of 尾-HCH soil residue. Results demonstrate that the primary emission dominates 尾-HCH soil residues during the use of this pesticide. After phase-out of the pesticide in 1999, the change in 尾-HCH soil residues has been associated with the Asian summer monsoon, featured by northward displacement of the MCSR. The displacement from several major sources in China and northeastern Asia shows a downward trend at a 95% confidence level, largely caused by environmental degradation and northward delivery of 尾-HCH under cold condition in northern area. The MCSRs away from the India and southern and southeastern Asia sources show a rapid northward displacement at a 99% confidence level, featuring the cold trapping effect of the Tibetan Plateau.