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ISO 5440:1978

Current Revision

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

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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.


SDO ISO: International Organization for Standardization
Document Number ISO 5440
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 47
Publish Date Document Id Type View
Not Available ISO 5440:1978 Revision