标准摘要
[中文适用范围]： 适用于以CO2表示的含量大于0.01%（m/m）的产品。 涉及既不含硫化物又不含氯酸盐或仅含硫化物或仅含氯酸盐的产品。 通过在甲基橙存在下煮沸酸化的测试样品并在蒸气中使用醋酸铅纸条进行初步测试。 硫化物使纸张变黑，氯酸盐使甲基橙褪色。 不含硫化物和氯酸盐的产品：通过酸化和加热释放二氧化碳。 夹带在气流中并吸收在过量的氢氧化钡溶液中。 在百里酚酞作为指示剂存在下，用标准容量盐酸溶液滴定过量的氢氧化钡溶液。 [外文原描述]： Applicable to products having contents, expressed as CO2 , of more than 0.01 % (m/m). Relates to a procduct containing neither sulphides nor chlorates or only sulphides or only chlorates. Preliminary test by boiling an acidified test sample in the presence of methyl orange and with a lead acetate paper strip in the vapour. The sulphides blacken the paper and chlorates delolourize the methyl orange. Products containing neither sulphides nor chlorates: liberation of carbon dioxide by acidification and heating. Entrainment in a flow of gas and absorption in an excess of barium hydroxide solution. Titration of the excess barium hydroxide solution with a standard volumetric hydrochloric acid solution in the presence of thymolphthalein as indicator.
英文名称Sodium hydroxide for industrial use — Determination of carbonates content — Titrimetric method