Publication: Residue analysis of organochlorine pesticides in the Mae Klong River of central Thailand.
Issued Date
2007
Resource Type
Language
eng
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Mahidol University
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Elsevier
Bibliographic Citation
Journal of Hazardous Materials. vol.156, No. 1-3 (2007), 230-239
Suggested Citation
Poolpak, T., Pokethitiyook, P., Kruatrachue, M., Arjarasirikoon, U., Thanwaniwat, N., Maleeya Kruatrachue. Residue analysis of organochlorine pesticides in the Mae Klong River of central Thailand.. Journal of Hazardous Materials. vol.156, No. 1-3 (2007), 230-239. Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/9953
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Title
Residue analysis of organochlorine pesticides in the Mae Klong River of central Thailand.
Other Contributor(s)
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 214.91 μg g(-1) dw in the first year. In the second year,
total residue concentrations in the surface sediments were in the range of 3.26-
215.09 μg g(-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.