Алюминий фтористый технический. Определение содержания диоксида кремния. Спектрофотометрический метод с применением восстановленного кремнемолибденового комплекса
Название (англ.):
Aluminium fluoride for industrial use; Determination of silica content; Spectrophotometric method using the reduced silicomolybdic complex
Описание (англ.):
The method can be applied provided the phosphorus pentoxide content does not exceed 0,02 % (m/m). The principle is based on alkaline fusion of a test portion by means of a mixture of sodium carbonate and boric acid. Solution of thefused mass in excess nitric acid so that the pH of the final solution is between 0,3 and 0,5 after being diluted. Formation, in a suitable aliquot portion, of the (yellow) oxidized silicomolybdic complex under clearly defined conditions of acidity, concentration of reagents, temperature and time. Selective reduction in a high acidity sulphuric acid medium and in the presence of tartaric acid. Spectrophotometric measurement at a wavelength of about 815 nm.
Дата введения:
01.12.72
Дата отмены:
30.05.02
Код КГС:
Л19
Код ОКСТУ:
2154;2109
Код ОКС(МКС):
71.060.50
Код ОКП:
2154;2109
Нормативные ссылки:
AMD 2028-1976, NEQ*BS 4993 PART 3-1974, NEQ*NBN T 03-439-1983, EQV*NF T20-161-1984, EQV
Ключевые слова:
ALUMINIUM ALUMINIUM HALIDES ALUMINIUM INORGANIC COMPOUNDS CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT FLUORIDES HALIDES SILICON DIOXIDE SPECTROPHOTOMETRY ALUMINIUM INO CHEMICAL ANALYSIS AND TESTIN INORGANIC COMPOUNDS