標準號：ISO 1691-1976
中文標準名稱：工業用硅酸鈉和硅酸鉀 碳酸鹽含量的測定 氣體容積法
英文標準名稱：Sodium and potassium silicates for industrial use; Determination of carbonates content; Gas-volumetric method
標準類型：G10
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：G10
國際標準分類號：71.060.50
適用范圍：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.