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ISO 3706:1976

Phosphoric acid for industrial use (including foodstuffs) -- Determination of total phosphorus (V) oxide content -- Quinoline phosphomolybdate gravimetric method

General information

Valid from 01.11.1976
Directives or regulations
None

Standard history

Status
Date
Type
Name
01.11.1976
Main
Applicable to products whether or not they are homogeneous and whether or not they contain polyphosphoric acids. Specifies preliminary hydrolysis of the polyphosphoric acids by boiling in the presence of hydrochloric acid. The precipitation of the phosphoric acid is carried out in the form of quinoline phosphomolybdate in the presence of acetone. Filtration by a filter crucible, washing, drying and weighing of the precipitate.

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Standard monitoring