Борат натрия неочищенный технический. Определение содержания окиси натрия и окиси бора. Волюметрический метод
Название (англ.):
Crude sodium borates for industrial use; Determination of sodium oxide and boric oxide contents; Volumetric method
Описание (англ.):
The principle of the method consists in determination of the Na2O content by treatment of an aqueous extract with an excess of hydrochloric acid solution, followed by back-titration with standard volumetric sodium hydroxide solution in the presence of methyl red as indicator. Subsequent titration of the boric oxide with standard volumetric sodium hydroxide solution in the presence of mannitolor sorbitol (the solution turns red; on titration with sodium hydroxide solution the colour of the solution changes to yellow and turns pink at the end point) and phenolphthalein as indicator to a distinct pink colour.
Дата введения:
01.07.72
Дата отмены:
30.05.02
Код КГС:
Л19
Код ОКСТУ:
2146;2109
Код ОКС(МКС):
71.060.50
Код ОКП:
2146;2109
Нормативные ссылки:
BS 5688 PART 8-1979, EQV*NBN T 03-348-1981, EQV*NF T20-564-1985, EQV*NP-1358-1976, EQV
Ключевые слова:
BORATES BORIC OXIDE CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT SODIUM SODIUM BORATES SODIUM OXIDES VOLUMETRIC ANALYSIS CHEMICAL ANALYSIS AND TESTIN