A Study on Removal Effect of Residual Pesticide on Adsorbent

This study was carried out to investigate adsorption characteristics of residual pesticides on an adsorbent. Bauxsol TM and mackban-stone as adsorbent were used. Analytical method for residual pesticides was established by GC/NPD and GC/μECD. Pesticides used in this study were α-endosulfan, β-endosulfan, pendimethalin and chlorpyrifos-methyl, fenitrothion, and recovery rates were more than 97%. Adsorption rate on an adsorbent was decreased in order of endosulfan, chlorpyrifos-methyl, pendimethalin, fenitrothion. Organochlorine pesticides showed higher removal rate than the other pesticides. Bauxsol TM gave both chemical decomposition and physical adsorption. Mackban-stone gave only physical adsorption on the other hand. The high pH and chloric ions structure of eluted solution have greatly affected at chemical resolution. The removal rate of pesticides was increased due to the physical property of adsorbent, i.e. high porosity. The above adsorbent is to be a candidate to remove residual pesticides in water and pond of links.