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以高压汞灯为光源,研究了水体中存在的几种离子(Na~+、K~+、SO_4~(2-)、Cl~-、Br~-、I~-)对顺式氯氰菊酯光解的影响。实验结果表明Na~+、K~+、SO_4~(2-)这3种离子对顺式氯氰菊酯几乎没有影响,在添加K_2SO_4和Na_2SO_4的情况下顺式氯氰菊酯的光解半衰期与在纯水中的半衰期的相比率分别为1.01及1.02;卤素离子Cl~-、Br~-、I~-均对顺式氯氰菊酯有光猝灭作用,而且随着浓度的增大,猝灭作用增强;这3种卤素离子对顺式氯氰菊酯光猝灭作用的大小为I~->Br~->Cl~-;这说明,在进行各种离子对顺式氯氰菊酯光解研究时,为避免综合因素影响可以选择钠盐或钾盐;另外Cl~-、Br~-、I~-对顺式氯氰菊酯光解有着较大影响。
Using high pressure mercury lamp as light source, the effects of several ions (Na ~ +, K ~ +, SO 4 2-, Cl ~ -, Br ~ -, I ~ Impact. The experimental results show that Na ~ +, K ~ + and SO_4 ~ (2-) ions have almost no effect on cypermethrin. The photolysis half-life of cypermethrin with K_2SO_4 and Na_2SO_4 is The relative rates of half-lives were 1.01 and 1.02, respectively. Both of the halogen ions Cl ~ -, Br ~ - and I ~ all quenched the photosynthetic rate of cyhalothrin and the quenching effect was enhanced with the increase of the concentration. Halogen ions on the cyhalothrin photodegradation of the size of I ~ -> Br ~ -> Cl ~ -; This shows that in the various ion-pair cypermethrin photolysis studies, in order to avoid the combined effects of factors can choose sodium Salt or potassium salt; In addition Cl ~ -, Br ~ -, I ~ - have a greater impact on the photodegradation of cypermethrin.