ISO 1691-1976 工业用硅酸钠和硅酸钾 碳酸盐含量的测定 气体容积法

标准号：ISO 1691-1976
中文标准名称：工业用硅酸钠和硅酸钾 碳酸盐含量的测定 气体容积法
英文标准名称：Sodium and potassium silicates for industrial use; Determination of carbonates content; Gas-volumetric method
标准类型：G10
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：G10
国际标准分类号：71.060.50
适用范围：Three cases, defined by a preliminary test, are envisaged: silicates containing neither sulphides nor chlorates; silicates containing sulphides; silicates containing chlorates. The method based on boiling of an acidified test portion containing methyl orange and with a lead paper strip in the vapour. The presence of sulphides produces blackening of the paper and the presence of chlorates decolorizes the methyl orange. Volumetric; measurement of carbon dioxide evolved from silicates containing neither sulphides nor chlorates by reaction with a hydrochloric acid solution. The principle for the oxidation of sulphides and the reduction of chlorates are specified.