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ISO/R 1595:1970

Urea for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method

Jul 1, 1970
95.99   Withdrawal of Standard   May 27, 2002

General information

95.99     May 27, 2002

ISO

ISO/TC 47

None of the other values

71.080.30  

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Scope

Describes a method applicable to iron contents greater than or equal to 0.00005 % (m/m). The principle is based on the ignition of the material at 800 °C and fusion of the residue with anhydrous potassium hydrogen sulphate. Solution of the cooled melt in hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of an iron(II)-2,2'bipyridyl complex in the presence of a buffered solution (pH value between 4.5 and 6). Photometric measurement of the coloured complex at a wavelength of about 522 nm.

Life cycle

NOW

WITHDRAWN
ISO/R 1595:1970
95.99 Withdrawal of Standard
May 27, 2002

REVISED BY

ABANDON
ISO/CD 1595

National adoptions

SRPS H.B8.152:1986  
ISS

Urea for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method

95.99   Withdrawal of Standard

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