Калий едкий технический. Определение содержания диоксида кремния. Фотометрический метод с применением восстановленного молибдосиликата
Название (англ.):
Potassium hydroxide for industrial use; Determination of silica content; Reduced molybdosilicate 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:
01.09.75
Дата отмены:
01.09.02
Код КГС:
Л19
Код ОКСТУ:
2109;2133
Код ОКС(МКС):
71.060.40
Код ОКП:
2109;2133
Нормативные ссылки:
BS 5634-1978, NEQ*NBN T 03-191-1980, EQV*NF T20-383-1977, EQV*NP-1348-1976, EQV
Ключевые слова:
CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING CHEMICALS DETERMINATION OF CONTENT POTASSIUM HYDROXIDE POTASSIUM HYDROXIDES SILICON DIOXIDE SPECTROPHOTOMETRIC ANALYSIS SPECTROPHOTOMETRY CHEMICAL ANALYSIS AND TESTIN