Reference number
ISO 731-5:1977
ISO 731-5:1977
Formic acid for industrial use — Methods of test — Part 5: Visual limit test for inorganic sulphates
Edition 1
1977-02
Withdrawn
ISO 731-5:1977
4976
Withdrawn (Edition 1, 1977)

Abstract

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).

General information

  •  : Withdrawn
     : 1977-02
    : Withdrawal of International Standard [95.99]
  •  : 1
     : 2
  • ISO/TC 47
    71.080.40 
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