Norm

ISO 9438:1993 en

Metallurgical-grade fluorspar - Determination of total phosphorus content - Reduced-molybdophosphate spectrometric method

  • Deze norm is ingetrokken sinds 19-05-2010

31,57

Over deze norm

Status Ingetrokken
Aantal pagina's 6
Gepubliceerd op 18-03-1993
Taal Engels
The principle of the method specified is to decompose a test portion by alkaline fusion and subsequent dissolution of the melt in excess of nitric acid, precipitation of iron(III) phosphate with ammonia solution, dissolution of the precipitate in nitric acid, formation of the molybdophosphate complex and extraction, followed by selective reduction of the complex to molybdenum blue, spectrometric measurement of the absorbance of the coloured complex at the wavelength of maximum absorption (about 710 nm). Applies to products having total phosphorus contents, expressed as PO, in the range 0,01 % (m/m) to 1,0 % (m/m).

Details

ICS-code 73.080
Nederlandse titel Metallurgical-grade fluorspar - Determination of total phosphorus content - Reduced-molybdophosphate spectrometric method
Engelse titel Metallurgical-grade fluorspar - Determination of total phosphorus content - Reduced-molybdophosphate spectrometric method

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