Кислота серная и олеум технические. Определение содержания аммиачного азота. Спектрофотометрический метод
Название (англ.):
Sulphuric acid and oleums for industrial use; Determination of ammoniacal nitrogen content; Spectrophotometric method
Описание (англ.):
Applicable to products having contents of more than 0.0001 % (m/m). The procedure described is suitable for contents between 0.0001 % (m/m) and 0.0005 % (m/m). It bases on distillation, with entrainment by steam, of the ammonia in the presence of an excess of sodium hydroxide and collection of the distillate in an excessof acid solution. Neutralization of the dexcess 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.
AMMONIACAL NITROGEN CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING DETERMINATION OF CONTENT NITROGEN OLEUM SPECTROPHOTOMETRIC ANALYSIS SPECTROPHOTOMETRY SULPHURIC ACID CHEMICAL ANALYSIS AND TESTIN