ISO 1690-1976 工业用硅酸钠和硅酸钾 二氧化硅含量的测定 不溶解物重量法

标准号：ISO 1690-1976
中文标准名称：工业用硅酸钠和硅酸钾 二氧化硅含量的测定 不溶解物重量法
英文标准名称：Sodium and potassium silicates for industrial use; Determination of silica content; Gravimetric method by insolubilization
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：The procedure is based on evaporation to dryness of a test portion previously acidified with hydrochloric acid. Dissolution of the soluble salts, filtration and washing of the insoluble matter. Second evaporation of the filtrate and washings under the same conditions, further dissolution of the soluble salts, filtration and washing. Calcination and weighing of the two lots of insoluble matter simultaneously. Volatilization of silica by heating with hydrofluoric and sulphuric acids and weighing of the residue after calcination. The; difference in mass represents the silica present in the test portion.