ISO 731-5:1977
Formic acid for industrial use; Methods of test; Part V : Visual limit test for inorganic sulphates

Standard No.

ISO 731-5:1977

Release Date

1977

Published By

International Organization for Standardization (ISO)

Status

Withdraw 2002-05

Latest

ISO 731-5:1977

Scope

The principle consists in a comparison of the turbidity, obtained by the addition of barium chloride to a solution prepared from a test portion in the presence of hydrochloric acid, with that similarly obtained from a standard sulphate solution. The method is a applicable to products having inorganic sulphates contents, expressed as sulphate (SO42-), in the range 0, 001 to 0, 1 % (m/m).

ISO 731-5:1977 history

• 1977 ISO 731-5:1977 Formic acid for industrial use; Methods of test; Part V : Visual limit test for inorganic sulphates