^(60)Co γ射线辐照降解多菌灵、噻菌灵和甲基托布津的研究

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

利用60Co γ射线辐照降解多菌灵、噻菌灵、甲基托布津,探讨了辐照剂量、初始浓度、p H和添加剂对3种农药降解效果的影响。结果表明,单一样品中,3种农药都能被有效地降解,其中甲基托布津降解成多菌灵;在混合样品中,低浓度的3种农药的降解效果随着辐照剂量的增加而增大,高浓度的混合样品中,随辐照剂量的增加噻菌灵降解效率增加,而甲基托布津的降解效率降低,由于甲基托布津降解成多菌灵,所以多菌灵的降解没有太大变化;添加剂Na NO3对多菌灵和噻菌灵的降解有抑制作用,对甲基托布津的降解有促进作用;正丁醇对3种农药的降解效果影响不大。

The degradation of carbendazim,thiabendazole and thiophanate methyl by 60Co γ-radiation was studied.The effects of irradiation doses,initial concentrations,pH 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 NaNO3.The addition of N-butanol had no significant effects on the degradation of three pesticides.