ISO 3391:1976 (R2020)
Active , Reaffirmed Standard
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ISO 3391:1976 (R2020)

Cryolite, natural and artificial — Determination of calcium content — Flame atomic absorption method

Summary

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.

Notes

90.93 : Norme internationale confirmée

Technical characteristics

Publisher International Organization for Standardization (ISO)
Publication Date 09/01/1976
Confirmation Date 11/03/2020
Edition 1
Page Count 4
EAN ---
ISBN ---
Weight (in grams) ---
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