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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