Norm

ISO 6676:1993 en

Acid-grade and ceramic-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 4
Gepubliceerd op 18-03-1993
Taal Engels
The method specified is based on dissolution of a test portion by fusion with a mixture of sodium carbonate, boric acid and sodium nitrate and subsequent acidification with nitric acid, formation of the molybdophosphate complex and extraction with a mixture of ethyl acetate and butyl acetate, followed by selective reduction of the complex to molybdenum blue by means of tin(II) chloride added to the organic phase, 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 Acid-grade and ceramic-grade fluorspar - Determination of total phosphorus content - Reduced-molybdophosphate spectrometric method
Engelse titel Acid-grade and ceramic-grade fluorspar - Determination of total phosphorus content - Reduced-molybdophosphate spectrometric method

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