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常甲基对流磷工业原油中游离对硝基酚含量较高时,于酸性介质中的极谱测定便受干扰,本文提出在微碱性介质中的测定方法,即采用44％乙醇水溶液中,含有0.075M氯化钾、0.0285M磷酸二氢钾、0.0233M硼砂和0.01％聚乙烯醇的底液,样品中对硝基酚重量即使是甲基对硫磷的50％,仍可获得分离良好的极谱波。使用这个方法,在35℃以下,于1.5小时内完成测定,可不受皂化的影响,测定的准确度和精密度满足工业分析的要求。
Normal methyl convection phosphorus industrial crude oil higher free nitrophenol content, the acid in the polarographic determination of interference will be disturbed, this paper proposed in a slightly alkaline medium determination, that is, using 44% aqueous ethanol solution, With a bottom liquid containing 0.075 M potassium chloride, 0.0285 M potassium dihydrogen phosphate, 0.0233 M borax and 0.01% polyvinyl alcohol, the weight of p-nitrophenol in the sample was good even for 50% of methyl parathion Polarographic wave. Using this method, the measurement is completed in less than 35 ° C within 1.5 hours, without being affected by saponification. The accuracy and precision of the determination meet the requirements of industrial analysis.