Norm

ISO 5930:1979 en

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

31,57

Over deze norm

Status Definitief
Aantal pagina's 4
Gepubliceerd op 01-07-1979
Taal Engels
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.

Details

ICS-code 71.060.50
Nederlandse titel Cryolite, natural and artificial, and aluminium fluoride for industrial use - Determination of phosphorus content - Reduced molybdophosphate photometric method
Engelse titel Cryolite, natural and artificial, and aluminium fluoride for industrial use - Determination of phosphorus content - Reduced molybdophosphate photometric method

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