Distribution of Organochlorine Pesticides in the Chao Phraya River, Thailand |
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| Authors: | R. Boonyatumanond M.S. Tabucanon C. Siriwong P. Prinyatanakun |
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| Affiliation: | (1) Environmental Research and Training Centre, Department of Environmental Quality Promotion, Technopolis, Klong Luang District, Pathumthani, 12120, Thailand;(2) Faculty of Environmental Management Establishment Program, Prince of Songkla University, Hatyai, Thailand |
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| Abstract: | Water samples from the Chao Phraya River, the main river in Thailand were collected and analyzed during 1988–1994. Organochlorine pesticides such as HCHs, DDTs, aldrin, dieldrin and chlordanes were determined. Aldrin and dieldrin had high frequencies of occurrence in water samples. The concentration median of the pesticides was approximately one order of magnitude higher than those of total HCHs and DDTs. Levels of aldrin were relatively high in the upstream while levels of DDTs were high in the urban area of Bangkok during 1989–1990. p,p -DDE levels were relatively higher in 1992. No clear trends in the levels of pesticides were observed. |
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