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Residue analysis of organochlorine pesticides in the Mae Klong river of Central Thailand

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Title: Residue analysis of organochlorine pesticides in the Mae Klong river of Central Thailand
Authors: Poolpak, T.1, Pokethitiyook, P.1 scppg@mahidol.ac.th, Kruatrachue, M.1,2, Arjarasirikoon, U.1, Thanwaniwat, N.1
Source: Journal of Hazardous Materials. Aug2008, Vol. 156 Issue 1-3, p230-239. 10p.
Subjects: Agricultural chemicals, Pest control, Organochlorine compounds, Pesticide residues in food
Abstract: Abstract: The most natural waterways in Thailand are utilized for conventional agricultures, e.g. irrigation and wastewater discharge. Concentrations of 20 organochlorine pesticides (OCPs) were measured in surface sediments collected from the tributaries of the Mae Klong river during 2003–2005. The sampling sites chosen were nearby the rice paddy which organochlorine pesticides were intensively used for crop cultivation. Solid–liquid extraction technique was used for sediment extraction, and gas chromatography with electron capture detector was applied for pesticides determination. Total concentrations of OCPs found were ranged from 4.12 to 214.91μgg−1 dw in the first year. In the second year, total residue concentrations in the surface sediments were in the range of 3.26–215.09μgg−1 dw. Concentrations of pesticides were greater in dry-season rice cultivation period in both sampling years, and heptachlor epoxide was the contaminant found at highest concentration in this study. In addition, the occurrence of some selected contaminants including DDT, DDD and DDE reflects the recent contamination in the study area. This demonstrates not only that the natural waterway was polluted and contained much pesticide residues, but it also illustrates the necessity of a continuous long-term monitoring of the affected environment. [Copyright &y& Elsevier]
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Database: Engineering Source
Description
Abstract:Abstract: The most natural waterways in Thailand are utilized for conventional agricultures, e.g. irrigation and wastewater discharge. Concentrations of 20 organochlorine pesticides (OCPs) were measured in surface sediments collected from the tributaries of the Mae Klong river during 2003–2005. The sampling sites chosen were nearby the rice paddy which organochlorine pesticides were intensively used for crop cultivation. Solid–liquid extraction technique was used for sediment extraction, and gas chromatography with electron capture detector was applied for pesticides determination. Total concentrations of OCPs found were ranged from 4.12 to 214.91μgg−1 dw in the first year. In the second year, total residue concentrations in the surface sediments were in the range of 3.26–215.09μgg−1 dw. Concentrations of pesticides were greater in dry-season rice cultivation period in both sampling years, and heptachlor epoxide was the contaminant found at highest concentration in this study. In addition, the occurrence of some selected contaminants including DDT, DDD and DDE reflects the recent contamination in the study area. This demonstrates not only that the natural waterway was polluted and contained much pesticide residues, but it also illustrates the necessity of a continuous long-term monitoring of the affected environment. [Copyright &y& Elsevier]
ISSN:03043894
DOI:10.1016/j.jhazmat.2007.12.078