Криолит природный и искусственный и фтористый алюминий технический. Определение содержания фосфора. Фотометрический метод с применением восстановленного молибдофосфата
Название (англ.):
Cryolite, natural and artificial, and aluminium fluoride for industrial use; Determination of phosphorus content; Reduced molybdophosphate photometric method
Описание (англ.):
Specifies a method applicable to products having phosphorus contents equal to or greater than 0,002 % (m/m). The principle is based on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid, dissolution of the fused mass in nitric acid, neutralization of suitable aliquot portion with sodium hydroxide solution, reactionwith acid ammonium molybdate solution to form a molybdophosphate complex, reduction by a mixture of sodium disulphite and 4-amino-3-hydroxynaphtalene-1-sulphonic acid, and photometric measurement of the reduced complex.
Дата регистрации:
28.08.79
Дата введения:
01.07.79
Код КГС:
Л19
Код ОКСТУ:
2154;2109
Код ОКС(МКС):
71.060.50
Код ОКП:
2154;2109
Нормативные ссылки:
NBN T 03-448-1983, EQV*NF T20-161-1984, EQV
Ключевые слова:
ALUMINIUM FLUORIDES CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING CRYOLITE DETERMINATION OF CONTENT PHOSPHOMOLYBDATES PHOSPHORUS REDUCED PHOSPHOMOLYBDATE SPECTROPHOTOMETRIC ANALYSIS SPECTROPHOTOMETRY CHEMICAL ANALYSIS AND TESTIN