Active standard | Published: 01/10/1978

ISO 5440:1978

Sodium hexafluorosilicate for industrial use — Determination of phosphate content — Molybdovanadate spectrophotometric method
(Hexafluorosilicate de sodium a usage industriel — Dosage des phosphates — Méthode spectrophotométrique au molybdovanadate)

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Detail information

Designation: ISO 5440:1978

Publication date: 01/10/1978

Pages: 3

Country: International technical standard

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Anotation

Description / Abstract: 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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