Simulating the transfer and fate of hexachlorocyclohexane in recent 50 years in Beijing,China |
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| Authors: | Hongying?Cao Email author" target="_blank">Tao?LiangEmail author Shu?Tao |
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| Institution: | 1. Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2. Laboratory for Earth Surface Processes, Peking University, Beijing 100871, China |
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| Abstract: | Taking Beijing as a study area, a dynamic fugacity model was used to simulate the transfer and fate of technical HCHs according
to the physic-chemical properties of the studying environment and HCH isomers. Dynamic changes of the transfer fluxes and
concentrations of HCH isomers during 1952-2003 were simulated and the model results suggest good agreement between the calculated
and measured concentrations of HCH isomers. During 1952-1983, the average input and output amount of HCHs through agricultural
application and degradation are 130 t and 150 t respectively. The dominant transfer processes of HCHs in the study area are
air-soil deposition, soil erosion and soil-air diffusion, transfer fluxes of these processes are 80 t⋅a−1, 16 t⋅a−1 and 11 t⋅a−1, which account for 92% of total transfer fluxes of HCHs isomers. There were approximately 253t HCHs in all environmental
compartments of the study area during this period and 97% of which existed in soil compartment. Air and water advection became
the dominant input sources of HCHs after 1984 when the application of technical HCHs was prohibited, concentration of HCHs
quickly descended to a quite low level in several years. Total amount of HCHs isomers remaining in the study area environment
now is less than 5% that before 1983, and this percentage may descend to 0.5% after 20 years by prediction. |
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| Keywords: | fugacity model hexachlorocyclohexane compartment transfer flux fate |
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