On the spatial and temporal variations in atmospheric concentrations of hexachlorobenzene and hexachlorocyclohexane isomers at several locations in the province of Ontario,Canada |
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| Institution: | 1. Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong, China;2. Division of Atmospheric Sciences, Desert Research Institute, Reno, NV 89512, USA;3. Key Laboratory of Aerosol, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an, China;4. School of Public and Community Health Sciences, University of Montana, Missoula, MT, USA;5. Institute of Global Environmental Change, Xi''an Jiaotong University, Xi''an, China;6. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China;7. Department of Geography and Resource Management, The Chinese University of Hong Kong, Hong Kong;8. The Jockey Club School of Public Health and Primary Care, The Chinese University of Hong Kong, Hong Kong, China |
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| Abstract: | Hexachlorobenzene (HCB), as well as α- and γ-hexachlorocyclohexane (HCH) have been measured at seven sites in Ontario, Canada during the years 1985–1989. While two of the locations were close to a suspected source of the organochlorines, five were sites that reflected the non-urban airshed loadings which are considered to be regionally representative of the Great Lakes. At the non-urban locations, the γ-HCH (lindane) and α-HCH concentrations ranged from 15 to 190 pg m?3 (mean of 47 pg m?3) and 50 to 660 pg m?3 (mean of 240 pg m?3), respectively. The HCB concentrations varied from 20 to 310 pg m?3 (mean of 94 pg m?3). At the suspected source locations, the α:γ HCH ratio was less than unity while at locations distant from known or suspected sources, the α:γ ratio was usually greater than 7. At the non-urban locations, the highest concentrations of the α- and γ-HCH isomers were observed during the summer and the lowest concentrations were seen during the winter. The concentration of HCB, however, remained relatively constant throughout the year. |
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