ISO 4274:1977

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Urea for industrial use — Determination of biuret content — Flame atomic absorption and photometric absorption methods

Published By	Publication Date	Number of Pages
ISO	1977-10	8

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Categories: 71.080.30 - Organic nitrogen compounds, ISO

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Description

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 fotometric absorption). 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.

Additional information

Published Code	ISO
Published By	International Organization for Standardization
Publication Date	1977-10
Pages Count	8
Language	English
Edition	1
File Size	450.6 KB
ICS Codes	71.080.30 - Organic nitrogen compounds

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ISO 4274:1977

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