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ISO 731-5:1977 PDF
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Formic acid for industrial use — Methods of test — Part 5: Visual limit test for inorganic sulphates
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).
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| Edition | 1977 |
|---|---|
| Standard Part No | 5 |
| Published Date | 1977 |
| Published By | International Standardization Organisation |
| Page Count | 2 |
