Силикаты натрия и калия технические. Определение содержания диоксида кремния с переводом в нерастворимую форму. Гравиметрический метод
Название (англ.):
Sodium and potassium silicates for industrial use; Determination of silica content; Gravimetric method by insolubilization
Описание (англ.):
The procedure is based on evaporation to dryness of a test portion previously acidified with hydrochloric acid. Dissolution of the soluble salts, filtration and washing of the insoluble matter. Second evaporation of the filtrate and washings under the same conditions, further dissolution of the soluble salts, filtration and washing. Calcination and weighing of the two lots of insoluble matter simultaneously. Volatilization of silica by heating with hydrofluoric and sulphuric acids and weighing of the residue after calcination. The; difference in mass represents the silica present in the test portion.
Дата введения:
01.02.76
Код КГС:
Л19
Код ОКСТУ:
2145;2109
Код ОКС(МКС):
71.060.50
Код ОКП:
2145;2109
Нормативные ссылки:
BS 6092 PART 3-1981, EQV*NBN T 03-235-1980, EQV*NF T20-523-1973, EQV*NP-1317-1976, EQV
Ключевые слова:
CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT GRAVIMETRIC ANALYSIS POTASSIUM POTASSIUM SILICATES SILICON DIOXIDE SODIUM SODIUM SILICATES CHEMICAL ANALYSIS AND TESTIN