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对4种农药(二嗪磷、马拉硫磷、精异丙甲草胺和西维因)在不同pH值(4.0、7.0和10.0)条件下采用高锰酸钾、次氯酸钠、过氧化氢和UV254光照等处理方法的降解效果进行了研究。结果表明,氧化方式和溶液pH值均对农药的降解效果存在显著影响,其中在UV光照条件下4种农药均能得到不同程度地降解。二嗪磷在碱性条件下采用次氯酸钠作为氧化剂时的降解效果最好,氧化反应180 min时的降解率达90%以上。马拉硫磷和西维因在碱性条件下采用4种氧化方式时均能达到很好的降解效果。精异丙甲草胺只在UV光照时才有明显的降解效果,光照反应90 min时的降解率达90%以上,光照180 min能够将其完全去除。研究对UV光照下4种农药的降解反应动力学进行了探讨,结果表明,其均符合一级反应动力学。
Four pesticides (diazinon, malathion, s-metolachlor and cevimene) were treated with potassium permanganate, sodium hypochlorite, hydrogen peroxide and potassium hydroxide at different pH values (4.0, 7.0 and 10.0) UV254 light treatment methods such as degradation of the study. The results showed that both the oxidation mode and the solution pH had a significant effect on the degradation of pesticides, and all the four pesticides could be degraded to different degrees under UV light irradiation. Diazinon under the alkaline conditions using sodium hypochlorite as the oxidant degradation best, the oxidation reaction 180 min when the degradation rate of more than 90%. Malathion and carbaryl in the alkaline conditions using four kinds of oxidation can achieve good degradation. Metolamin only had obvious degradation effect under UV light irradiation, the degradation rate of 90 min after irradiation was above 90%, and it could be completely removed after 180 min of illumination. The kinetics of degradation reactions of four pesticides under UV light were studied. The results showed that all of them were in accordance with the first order reaction kinetics.