ISO 5930:1979

Cryolite, natural and artificial, and aluminium fluoride for industrial use — Determination of phosphorus content — Reduced molybdophosphate photometric method ISO 5930:1979

Publication date:   Jul 1, 1979

95.99 Withdrawal of Standard   Feb 25, 2019

General information

95.99 Withdrawal of Standard   Feb 25, 2019

ISO

ISO/TC 226 Materials for the production of primary aluminium

International Standard

71.060.50   Salts

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Scope

Specifies a method applicable to products having phosphorus contents equal to or greater than 0,002 % (m/m). The principle is based on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid, dissolution of the fused mass in nitric acid, neutralization of suitable aliquot portion with sodium hydroxide solution, reaction with acid ammonium molybdate solution to form a molybdophosphate complex, reduction by a mixture of sodium disulphite and 4-amino-3-hydroxynaphtalene-1-sulphonic acid, and photometric measurement of the reduced complex.

Life cycle

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WITHDRAWN
ISO 5930:1979
95.99 Withdrawal of Standard
Feb 25, 2019