Abstract

In this study, a series of experiments were conducted using a standard solution containing <TEX>${\alpha}$</TEX> and <TEX>${\beta}$</TEX>-endosulfan to follow the removal effect of residual pesticides on soil and aqueous solution. An analytical method for residual pesticides was established by a gas chromatography equipped Ultra II[<TEX>$(30m{\times}0.25mm(ID){\times}0.25{\mu}m$</TEX>] capillary column and a <TEX>${\mu}$</TEX>-electron capture detector(<TEX>${\mu}$</TEX>-ECD). Recovery rates of residual pesticides for soil samples were 96-100%. The amount of <TEX>${\alpha}$</TEX> and <TEX>${\beta}$</TEX>-endosulfan that was spread in the soil was checked for various period of time. It indicated that the amount was reduced to 73 and 61%, respectively. When the water spread amount increased from 10 to 100 mL, <TEX>${\alpha}$</TEX>-endosulfan was eliminated from 45 to 85% and while <TEX>${\beta}$</TEX>-endosulfan from 44 to 88%. Removal rates of <TEX>${\alpha}$</TEX>-endosulfan and <TEX>${\beta}$</TEX>-endosulfan were 99% and 98% respectively within 30 minutes. It was assumed that the organic salts and strong alkali elements contained in the pesticide degradator hydrolyzed the residual pesticide.