Sodium hexafluorosilicate for industrial use -- Determination of phosphate content -- Molybdovanadate spectrophotometric method

Document Number: ISO 5440:1978
File Size: 278 kB
Language: English
Provider: ANSI
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Applicable to products having contents, expressed as phosphorus pentoxide, of 0.005 % (m/m) to 0.05 % (m/m). The residue from the determination of the loss of mass according to ISO 5444 is used to prepare the test sample. Dissolution in dilute hydrochloric acid and nitric acid solutions. Formation of the yellow molybdovanadate and spectrophotometric measurement at a wavelength of about 420 nm. Calculation of the content from the measured absorbance.

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