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ISO 7099:1983

Withdrawn Date published:

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Phosphoric acid for industrial use (including foodstuffs) — Determination of hydrogen sulfide content — Titrimetric method

The hydrogen sulphide in a test portion is removed in a stream of nitrogen and absorbed in a solution of sodiumhydroxide in aqueous acetone. the sulphide ions are titrated with standard volumetric mercury(II) acetate solution, in the presence of 1,5-diphenylthiocarbazone (dithizone) as indicator. The method is applicable to products having hydrogen sulfide contents greater than or equal to 0.05 mg/kg.

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  • BS 4258-13:1990

    Methods of test for phosphoric acid (orthophosphoric acid) for industrial use, Determination of soluble sulphate content (potentiometric method)

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ISO 7099:1983

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