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ISO 3361:1975

Withdrawn Date published:

Warning: Withdrawn Standard. This document has been withdrawn without replacement. You may wish to search for a more up to date equivalent.

Phosphoric acid for industrial use — Determination of soluble silica content — Reduced molybdosilicate spectrophotometric method

Specifies a reduced molybdosilicate spectrophotometric method for the determination of the soluble silica content of phosphoric acid for industrial use. The method can be used for the determination of 1 µg of soluble silica in the presence of 20 mg of phosphorus pentoxide. It is thus, for example, applicable to the determination of soluble silica contents greater than 30 mg/kg if the phosphoric acid contains 60 % of phosphorus pentoxide.

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Related Information

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    Methods of test for sulphuric acid, oleum and liquid sulphur trioxide

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  • BS 4258-12:1982

    Methods of test for phosphoric acid (orthophosphoric acid) for industrial use, Guide to sampling techniques

  • 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 3361:1975

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