Натр едкий технический. Определение содержания диоксида кремния. Фотометрический метод с применением восстановленного кремнемолибденового комплекса
Название (англ.):
Sodium hydroxide for industrial use; Determination of silica content; Reduced silico-molybdic complex photometric method
Описание (англ.):
The method is applicable to products having silica contents exceeding 10 mg/kg. The principle is based on the formation of yellow oxidized silico-molybdic complex in a strongly acid medium, in the presence of boric acid to suppress interference by fluorides. Selective reduction of this complex with a mixture ofaminonaphtholsulphonic acid (4-amino-3-hydroxynaphthalene-1-sulphonic acid), sodium metabisulphite and sodium sulphite, in the presence of oxalic acid and in a strongly acid medium so as to suppress interference by phosphates. Photometric measurement of the blue-coloured complex at a wavelength of about 795 nm.
Дата введения:
01.12.74
Дата отмены:
01.09.02
Код КГС:
Л19
Код ОКСТУ:
2132;2109
Код ОКС(МКС):
71.060.40
Код ОКП:
2132;2109
Нормативные ссылки:
BS 6075 PART 4-1981, EQV*NBN T 03-126-1980, EQV*NF T20-424-1976, EQV*NP-1347-1976, EQV*NS 9047-1981, NEQ
Ключевые слова:
CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING CHEMICALS DETERMINATION OF CONTENT SILICON DIOXIDE SODIUM HYDROXIDE SPECTROPHOTOMETRIC ANALYSIS SPECTROPHOTOMETRY CHEMICAL ANALYSIS AND TESTIN