아산만의 유기인계 농약 ; 분포특성

Abstract

Organophosphorous pesticides (OPs) characteristics were studied over the period May 2005-December 2007 at ten sampling sites in Asan Bay, Korea. During the study period 28 Organophosphorous pesticides dissolved in surface water and adsorbed on suspended particle were measured. DDVP, IBP, Phorate, disulfoton had higher adsorption capacity onto suspended particle than the others correlated with adsorption coefficient (Kd) of OPs. In the surface water, IBP and DDVP had significantly higher concentrations than other OPs, with ranging fiom not detected to 9154.5ng/L for IBP and to 2816.9ng/L for DDVP. Mevinphos, ethoprophos, disulfoton, dlazinon, azinphos methyl and azinphos ethyl were relatively frequently observed in Asan Bay, Korea, during this study period. In general, the concentrations of OPs, dissolved in surface seawater, in summer were higher than in winter. The highest concentrations of OPs were determined from June to September related to seasonal applicatiom pattern of OPs. The concentrations of OPs generally decreased with increasing distance from the mouth of Asan Bay, implying progressive dilution of pesticides in the estuarine system.