ISO-3357 › Sodium tripolyphosphate and sodium pyrophosphate for industrial use -- Determination of total phosphorus(V) oxide content -- Quinoline phosphomolybdate gravimetric method
ISO-3357
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1ST EDITION
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CURRENT
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Based on hydrolysis of a test portion by prolonged boiling in the presence of hydrochloric acid. Precipitation of the phosphate ions in the form of quinoline phosphomolybdate in the presence of acetone. Filtration by means of a filter crucible, washing, drying and weighing of the precipitate.
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Document Number
ISO 3357:1975
Revision Level
1ST EDITION
Status
Current
Publication Date
Sept. 1, 1975
Committee Number
ISO TC 47