Криолит природный и искусственный. Определение содержания железа. Фотометрический метод с применением 1,10-фенантролина
Название (англ.):
Cryolite, natural and artificial; Determination of iron content; 1,10- Phenanthroline photometric method
Описание (англ.):
Applies for the determination of natural and synthetic materials having a molar ratio sodium fluoride/aluminium trifluoride between 3 and 1,7 approximately. The method is applicable to products having an iron content equal to or greater than 0,020 % (m/m). The principle consists indissolution of a test portion by either alkaline or acid fusion. Reduction of iron(III) with hydroxylammonium chloride, formation of the complex iron(II)-1, 10-phenathroline in a buffered medium at pH value between 3,5 and 4,2. Photometric measurement of the coloured complex at a wavelength of about 510 nm. Applies ISO Recommendation R 1694-1970.
Дата введения:
01.09.76
Код КГС:
Л19;А19
Код ОКСТУ:
1711;1709;2109
Код ОКС(МКС):
71.060.50
Код ОКП:
1711;1709;2109
Нормативные ссылки:
BS 5050-1974, NEQ*NBN T 03-434-1983, EQV
Ключевые слова:
ALUMINIUM ORES CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING CRYOLITE DETERMINATION OF CONTENT IRON SPECTROPHOTOMETRIC ANALYSIS SPECTROPHOTOMETRY CHEMICAL ANALYSIS AND TESTIN