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

作者：Xu, Yue; Tian, Chongguo^*; Ma, Jianmin; Zhang, Gan; Li, Yi-Fan; Ming, Lili; Li, Jun; Chen, Yingjun; Tang, Jianhui

来源：Environmental Science & Technology, 2012, 46(17): 9525-9532.

DOI：10.1021/es302017e

• POLYBROMINATED DIPHENYL ETHERS
• PERSISTENT ORGANIC POLLUTANTS
• ORGANOCHLORINE PESTICIDES
• POLYCHLORINATED-BIPHENYLS
• ALPHA-HCH
• HEXACHLOROCYCLOHEXANE
• INVENTORIES
• ATMOSPHERE
• DEPOSITION
• ISOMERS

Chinese Gridded Pesticide Emission and Residue Model was applied to simulate long-term environmental fate of beta-HCH in Asia spanning 1948-2009. The model captured well the spatiotemporal variation of beta-HCH soil concentrations across the model domain. beta-HCH use in different areas within the model domain was simulated respectively to assess the influence of the different sources of beta-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 beta-HCH soil residue. Results demonstrate that the primary emission dominates beta-HCH soil residues during the use of this pesticide. After phase-out of the pesticide in 1999, the change in beta-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 beta-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.

• 出版日期2012-9-4
• 单位中国科学院烟台海岸带研究所; 中国科学院广州地球化学研究所; 有机地球化学国家重点实验室