Degradating Carbendazim, Thiabendazole, Thiophanate Methyl by ~(60)Co γ-Radiation

The degradation of carbendazim, thiabendazole and thiophanate methyl by60 Co γ-radiation was studied. The effects of irradiation doses, initial concentrations, p H and additives on degradation rate were evaluated. The results showed that three pesticides effectively degraded in single samples. Thiophanate methyl was degraded to carbendazim. Degradation rate of low concentrations of three pesticides increased as the irradiation doses increased in mixed samples. In high concentrations of mixed samples, the degradation rate of thiabendazole increased, that of thiophanate methyl reduced and the degradation rate of carbendazim had no changes because thiophanate methyl was degraded to carbendazim. The degradation rate of carbendazim and thiabendazole were inhibited. The degradation rate of thiophanate methyl was stimulated by the addition of Na NO3. The addition of N-butanol had no significant effects on the degradation of three pesticides.