ISO 979:1974 工业用氢氧化钠.化验方法

标准编号：ISO 979:1974

中文名称：工业用氢氧化钠.化验方法

英文名称：Sodium hydroxide for industrial use — Method of assay

发布日期：1974-12

标准范围

滴定度的测定方法；这通常表示为NaOH的质量百分比，a）表示为总碱度，b）表示为苛性碱，相当于总碱度减去碳酸盐引起的碱度。该原理包括在甲基橙作为指示剂的情况下，用标准体积盐酸溶液滴定总碱度。两个量a）和b）的计算。二氧化碳的质量通过ISO 3196中规定的方法测定。该方法也已获得IUPAC的批准取消并替换ISO建议R 979-1969，该建议构成技术修订。

Method for determination of the titre; this is expressed conventionally as percentages by mass of NaOH, a) as total alkalinity and b) as caustic alkalinity, corresponding to the total alkalinity less the alkalinity due to carbonates. The principle consists in titration of the total alkalinity with standard volumetric hydrochloric acid solution in the presence of methyl orange as indicator. Calculation of the two amounts a) and b). The mass of carbon dioxide is determined by the method specified in ISO 3196. This method has also been approved by the IUPAC. - Cancels and replaces ISO Recommendation R 979-1969 of which it constitutes a technical revision.

标准预览图