標(biāo)準(zhǔn)號：ISO 1690-1976
中文標(biāo)準(zhǔn)名稱：工業(yè)用硅酸鈉和硅酸鉀 二氧化硅含量的測定 不溶解物重量法
英文標(biāo)準(zhǔn)名稱：Sodium and potassium silicates for industrial use; Determination of silica content; Gravimetric method by insolubilization
標(biāo)準(zhǔn)類型：G10
發(fā)布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標(biāo)準(zhǔn)分類號：G10
國際標(biāo)準(zhǔn)分類號：71.060.50
適用范圍：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.