Кислота азотная техническая. Определение содержания аммиачного азота. Спектрофотометрический метод
Название (англ.):
Nitric acid for industrial use; Determination of ammoniacal nitrogen content; Spectrophotometric method
Описание (англ.):
Applicable to products containing more than 0.0001 % (m/m) of ammoniacal nitrogen. The procedure described is siutable for contents between 0.0001 % (m/m) and 0.0005 % (m/m). The principle of the analysis consists in distillation, with entrainment by steam, of the ammonia in the presence of an excess ofsodium hydroxide and collection of the distillate in an excess of acid solution. Neutralization of the excess of acid and formation of the coloured complex by treatment with sodium phenate and sodium hypochlorite in the presence of acetone. Spectrophotometric measurement of the indophenol obtained at a wavelength of about 630 nm. Has also been approved by the IUPAC.
Дата регистрации:
05.05.74
Дата введения:
01.04.74
Дата отмены:
30.05.02
Код КГС:
Л19
Код ОКСТУ:
2121;2109
Код ОКС(МКС):
71.060.30
Код ОКП:
2121;2109
Нормативные ссылки:
BS 4367-1968, NEQ*NBN T 03-041-1979, EQV*NF T20-286-1982, EQV
Ключевые слова:
AMMONIACAL NITROGEN CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT NITRIC ACID NITROGEN SPECTROPHOTOMETRIC ANALYSIS SPECTROPHOTOMETRY CHEMICAL ANALYSIS AND TESTIN