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| Название (рус.): | Мочевина техническая. Определение содержания биурета. Методы атомной абсорбции в пламени и фотометрической абсорбции |
| Название (англ.): | Urea for industrial use; Determination of biuret content; Flame atomic absorption and photometric absorption methods |
| Описание (англ.): | Applicable to products having contents of equal to or more than 0.05 % (m/m) (with flame atomic absorption) or 0.1 % (m/m) (with fotometricabsorption). Covers the formation of a complex between biuret and copper(II) sulphate in alkaline medium. Fixation of this complex on an anion exchange resin. Elution of Cu first with a potassium nitrate solution and then with a nitric acid solution. Flame atomic absorption: aspiration of the solution into an acetylene-air flame and measurement of the absorption of the 325-nm line emitted by a copper hollow-cathode lamp; or by photometric absorption: formation of a coloured complex between Cu and zinc dibenzyldithiocarbamate, extraction with carbon tetrachloride and measurement at a wavelength of about 435 nm. Has also been approved by the IUPAC. |
| Дата регистрации: | 20.10.77 |
| Дата введения: | 01.10.77 |
| Дата отмены: | 30.05.02 |
| Код КГС: | Л59 |
| Код ОКСТУ: | 2609 |
| Код ОКС(МКС): | 71.080.30 |
| Код ОКП: | 2609 |
| Нормативные ссылки: | NBN T 04-311-1983, EQV*NP-1653-1980, EQV*NP-1654-1980, EQV |
| Ключевые слова: | BIURET CHEMICAL ANALYSIS CHEMICAL ANALYSIS AND TESTING CHEMICAL COMPOUNDS CONNECTIONS DETERMINATION OF CONTENT SPECTROPHOTOMETRIC ANALYSIS SPECTROPHOTOMETRY UREA UREAS CHEMICAL ANALYSIS AND TESTIN |
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