Reference number
ISO 731-7:1977
ISO 731-7:1977
© ISO 2024
ISO 731-7:1977
Formic acid for industrial use — methods of test — Part 7: Determination of low contents of other volatile acids — Titrimetric method after distillation
Edition 1
1977-02
1977-02
Withdrawn
Abstract
The principle consists in a decomposition of most of the formic acid in a test portion by sulphuric acid an of the remainder by chromic acid. Steam distillation of acetic acid and/or other volatile acids and titration of the distillate with standard volumetric sodium hydroxide solution in the presence of phenolphthalein as indicator. The method is applicable to products containing less than 0,5 % (m/m) of other volatile acids, expressed as acetic acid. The ISO Recommendation R 1913-1971 was review and has been changed to ISO 731/7. ISO 731/7 replaces ISO/R 1913-1971, to which it is technically identical.
Life cycle
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Previously
WithdrawnISO/R 1913:1971
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Now