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ISO 731-6:1977

Formic acid for industrial use — Methods of test — Part 6: Determination of iron content — 2,2'- Bipyridyl photometric method

Publication date:   Mar 1, 1977

95.99   Withdrawal of Standard   May 27, 2002

General information

95.99   Withdrawal of Standard   May 27, 2002

ISO

ISO/TC 47 Chemistry

International Standard

71.080.40   Organic acids

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Scope

Conversion of the iron in a test portion to iron(III) sulphate by evaporation to dryness in the presence of sulphuric acid. Dissolution in nitrid acid, reduction of the trivalent iron in the solution thus obtained by hydroxylammonium chloride. Photometric measurement of the coloured complex iron(II)-2,2' -dipyridyl. Applicable to products having Fe contents in the range 0,1 to 2 mg/kg.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO/R 1707:1970

NOW

WITHDRAWN
ISO 731-6:1977
95.99 Withdrawal of Standard
May 27, 2002