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The rapid determination of free acid and water-soluble phosphate in calcium superphosphate

✍ Scribed by Guthrie, F. C. ;Nance, J. T.

Publisher
Wiley (John Wiley & Sons)
Year
1949
Weight
260 KB
Volume
68
Category
Article
ISSN
0368-4075

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✦ Synopsis

Abstract

The sample of superphosphate is extracted with water, and the solution titrated with carbonate‐free sodium hydroxide in two stages with appropriate indicators. The first stage gives the free acid, and the second stage an approximate result for the primary calcium phosphate, Ca(H~2~PO~4~)~2~. A suitable volume of the sodium hydroxide is then titrated with the superphosphate solution, giving a reading from which a more accurate value for the primary calcium phosphate can be obtained. The total soluble phosphate determined in this way agrees well with that found by gravimetric analysis.

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