ISO 731-3:1977
Formic acid for industrial use; Methods of test; Part III : Determination of content of other acids; Potentiometric method

Standard No.

ISO 731-3:1977

Release Date

1977

Published By

International Organization for Standardization (ISO)

Status

Withdraw 2002-05

Latest

ISO 731-3:1977

Scope

The principle consists in a quantitative oxidation of the formic acid in a test portion with excess mercury(II) oxide. Potentiometric titration of the residual acids with standard volumetric sodium hydroxide solution. The method is applicable to products containing 0, 5 to 6, 0 % (m/m) of other acids, expressed as acetic acid. ISO/R 731 has been subdivised into seven parts. ISO 731/3 replaces clause 4 of ISO Recommendation R 731-1968.

ISO 731-3:1977 history

• 1977 ISO 731-3:1977 Formic acid for industrial use; Methods of test; Part III : Determination of content of other acids; Potentiometric method