This study was to investigate time-dependent degradation process under various pH condition for organophosphorus(org-p) insecticides, namely Demeton-s-methyl, Diazinon, Parathion, Phenthoate, and EPN in several waters. They were analysed by GC-FTD according to standard methods for the examination of water and wastewater. In pH=4, diazinon showed disappearance after 14 days in chromatogram. In pH=11, org-p insecticides were almost degradable after 7 days. In this condition, effect of pH on degradation process was greater than that of light. In pH=7, org-p insecticides persisted residues after 112 days except Demeton-s-methyl. In BOD_5 120, 250 ppm and domestic water, org-p insecticides showed also rapid degradation process.

• 김종향(경남보건환경연구원, Institute of Health and Environment)
• 하대식(경남보건환경연구원, Institute of Health and Environment)