ISO 5440:1978
Sodium hexafluorosilicate for industrial use; Determination of phosphate content; Molybdovanadate spectrophotometric method
- Standard No.
- ISO 5440:1978
- Release Date
- 1978
- Published By
- International Organization for Standardization (ISO)
- Latest
- ISO 5440:1978
- Scope
- 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.
ISO 5440:1978 history
- 1978 ISO 5440:1978 Sodium hexafluorosilicate for industrial use; Determination of phosphate content; Molybdovanadate spectrophotometric method
