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Degradation of Fungicide Tolclofos-methyl by Chemical Treatment
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 Title & Authors
Degradation of Fungicide Tolclofos-methyl by Chemical Treatment
Shin, Kab-Sik; Jeon, Young-Hwan; Kim, Hyo-Young; Hwang, Jung-In; Lee, Sang-Man; Shin, Jae-Ho; Kim, Jang-Eok;
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Tolclofos-methyl is one of the most widely used organophosphorous pesticides in control of soil-borne diseases in ginseng field. In Korea, residues of tolclofosmethyl in ginseng and cultivation soil is quite often detecting. The objective of this study was to know the possibility for the accelerated degradation of tolclofos-methyl by various chemical treatment under soil slurry condition. The degradation of tolclofos-methyl was accelerated by zerovalent metals treatment in soil slurry. The degradation rate of tolclofos-methyl was found to be at higher zerovalent zinc than unannealed zerovalent and annealed zerovalent iron. The effect of different sizes of zerovalent iron on tolclofos-methyl degradation was showed that the smaller size of zerovalent iron, the greater the degradation rate. In aqueous solution of pH 4.0 below the degradation rate of tolclofos-methyl was very high. Under this experimental condition, tolclofos-methyl degradation was the greatest at 2% (w/v) of ZVI under 0.1 N of HCl in 24 hours, the degradation rate was 94.4%. By testing various chemicals, it was found that as iron source showed better for degrading tolclofos-methyl in 500 mM treatment and sodium sulfite also showed the degradable possibility tolclofos-methyl in soil slurry.
Degradation;Fenton reagent;Sodium bisulfite;Tolclofos-methyl;ZVMs;
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