標準號：ISO 1232-1976
中文標準名稱：主要用于鋁生產(chǎn)的氧化鋁 二氧化硅含量的測定 鉬藍光度法
英文標準名稱：Aluminium oxide primarily used for the production of aluminium; Determination of silica content; Reduced molybdosilicate spectrophotometric method
標準類型：G10
發(fā)布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：G10
國際標準分類號：71.100.10
適用范圍：The method is applicable to products having a silica content between 0.005 % (m/m) and 0.025 % (m/m) provided that the content of phosphorus pentoxide plus vanadium pentoxide does not exceed 0.02 % (m/m). The principle of the method is based on the formation of oxidized molybdosilicate (yellow) under well-defined conditions of acidity, concentration of reagents, temperature and time. Selective reduction of the complex in a highly acidic medium of sulphuric acid and in the presence of tartaric acid. Spectrophotometric measurement of the reduced coloured complex at a wavelength of about 815 nm. - Replaces ISO Recommendation R 1232-1970.