ISO 5440:1978

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

Publication date: 1 tet 1978

General information

Current stage: 90.93 Effective date: 29 nën 2023

Originator: ISO

Owner: ISO/TC 47

Type: International Standard

ICS: 71.060.50

Gjuha: frëngjisht anglisht

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Statusi: Publikuar

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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.

Life cycle

NOW

PUBLISHED
ISO 5440:1978
90.93 Standard confirmed
29 nën 2023

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