ISO 3391:1976
ISO 3391:1976



Describes the preparation of the calibration graph and the dissolution of a test portion in concentrated sulphuric acid and heating on a hot-plate until the hydrofluoric acid has evaporated. Treatment of the residue with concentrated hydrochloric acid. Aspiration of the solution into an acetylene/dinitrogen monoxide flame and spectrophotometric measurement of the absorption of the 422.7-nm line emitted by a calcium hollow cathode lamp.

General information 

  •  :  Published
     : 1976-09
  •  : 1
     : 4
  •  : ISO/TC 226 Materials for the production of primary aluminium
  •  :
    71.060.50 Salts

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