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

ISO-5930 - 1ST EDITION - CURRENT


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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.

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Document Number

ISO 5930:1979

Revision Level

1ST EDITION

Status

Current

Publication Date

July 15, 1979

Committee Number

ISO TC 47/SC 7