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2.用酸度计测定溶溶的 pH化工产品的重要技术指标之一是其水溶液的 pH 值,例如氯化钠水溶液的 pH 应当是7,若低于7说明有酸性杂质;若高于7说明有碱性杂质。目前,化工产品多采用酸度计测定其水溶液的 pH 数值,尚无通则或通用方法。我国化学试剂标准有 GB9725—88“pH 值测定通则”和为酸度计定应用的 GB6851～6858—86“pH 基准试剂”标准;我国环保行业有GB6920—86“水质 pH 值的测定玻璃电极法”。这些标准均可供化工行业参考。
2. Determination of dissolved acid with pH meter One of the important technical indicators of chemical products is the pH value of its aqueous solution, such as the pH of the aqueous solution of sodium chloride should be 7, if less than 7 shows that there are acidic impurities; Alkaline impurities. At present, the pH value of aqueous solution is often measured by acidity meter. There are no general rules or general methods. China’s chemical reagent standards GB9725-88 “General Principles of pH determination” and for acidity meter applications GB6851 ~ 6858-86 “pH benchmark reagent” standards; China’s environmental protection industry GB6920-86 “Determination of water pH value of glass electrode method” . These standards are for the chemical industry reference.