Силикаты натрия и калия технические. Определение содержания сульфатов в виде сульфата бария. Гравиметрический метод
Название (англ.):
Sodium and potassium silicates for industrial use; Determination of sulphates content; Barium sulphate gravimetric method
Описание (англ.):
Applicable to the analysis of products having contents either above 0.1 % (m/m) or above 0.25 % (m/m) according to whether the product is readily or sparingly soluble in water. The principle consists in dissolution of a test portion either directly or after alkaline fusion. Separation of the insoluble matter. Precipitation, while boiling, of the sulphate ions in anacid medium. Filtration, washing and calcination of the precipitate. Weighing of the barium sulphate after treatment with hydrofluoric acid in order to remove any silica which may be present. Has also been approved by the IUPAC.
Дата введения:
01.03.75
Дата отмены:
30.05.02
Код КГС:
Л19
Код ОКСТУ:
2145;2109
Код ОКС(МКС):
71.060.50
Код ОКП:
2145;2109
Нормативные ссылки:
BS 6092 PART 8-1981, EQV*NBN T 03-241-1980, EQV*NF T20-527-1980, EQV*NP-1302-1976, EQV
Ключевые слова:
BARIUM SULPHATES CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT GRAVIMETRIC ANALYSIS POTASSIUM POTASSIUM SILICATES SODIUM SODIUM SILICATES SULPHATES CHEMICAL ANALYSIS AND TESTIN