Abstract Methyl parathion adsorption from the solution of 0.5 M H2SO4 (M = mol dm−3) on the surface of platinum electrode has be proven. When Pt electrode covered by adsorbed product is cycled between potentials of 0.4 V to −0.23 V, the split of adsorbed molecules of methyl parathion occur and molecules of p-nitrophenol are released. We assume that molecules of methanol are also released besides p-nitrophenol and molecules of methylthiophosphoric acid remain adsorbed on the surface of the platinum electrode. If oxidation of adsorbed product is realized by cycling between potentials of −0.23 V to 1.32 V, the split of adsorbed molecules of methyl parathion occur and molecules p-nitrophenol and methanol are released. The adsorbed methylthiophosphoric acid is completely mineralized. Degradation of methyl parathion was observed in the electrochemical cell with separated electrode compartments. After 12 h of cycling between potentials of −0.23 V to 1.32 V, the concentration of the methyl parathion decreased to 2.5% of starting value (5.3 × 10−5 M).

中文翻译：

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甲基对硫磷在铂电极上的电化学行为及降解

摘要 已证明 0.5 M H2SO4 (M = mol dm-3) 溶液在铂电极表面吸附甲基对硫磷。当被吸附产物覆盖的 Pt 电极在 0.4 V 至 -0.23 V 的电位之间循环时，吸附的甲基对硫磷分子发生分裂，释放对硝基苯酚分子。我们假设除了对硝基苯酚之外还释放出甲醇分子，并且甲基硫代磷酸分子仍然吸附在铂电极的表面上。如果通过在-0.23 V 到1.32 V 的电位之间循环来实现吸附产物的氧化，则会发生甲基对硫磷吸附分子的分裂，释放分子对硝基苯酚和甲醇。吸附的甲基硫代磷酸完全矿化。在具有分离电极室的电化学电池中观察到甲基对硫磷的降解。在 -0.23 V 至 1.32 V 的电位之间循环 12 小时后，甲基对硫磷的浓度降低至起始值的 2.5% (5.3 × 10-5 M)。