Résumé

The principle of the method specified is to decompose a test portion by a mixture of nitric, hydrofluoric and perchloric acids, dissolving the salts in hydrochloric acid after evaporation to dryness, extracting the lead from a dilute hydrochloric acid solution of the decomposed test portion into a solution of tri-n-octylphosphine oxide in 4-methyl-2-pentanone, aspirating the extract into the air/acetylene flame of an atomic absorption spectrometer, and measuring the absorbance at 283,3 nm. Applies to products having lead contents in the range 0,0006 % (m/m) to 0,01 % (m/m).


Informations générales 

  • État actuel
     : Annulée
    Date de publication
     : 1993-04
  • Edition
     : 2
    Nombre de pages
     : 6
  • Comité technique
     : ISO/TC 175 Spath fluor
  • ICS
     :
    73.080 Minerais non métallifères

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