ISO 3391:1976
ISO 3391:1976

Status : Published (Under review)

This standard was last reviewed and confirmed in 2020. Therefore this version remains current.
Format Language
std 1 42 PDF
std 2 42 Paper
  • CHF42
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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.

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General information

  •  : Published
     : 1976-09
    : International Standard confirmed [90.93]
  •  : 1
     : 4
  • ISO/TC 226
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