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

Informace o normě:

Označení normy: ISO 3391:1976
Datum vydání normy: 1.9.1976
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Mezinárodní technická norma
Kategorie: Technické normy ISO

Anotace textu normy ISO 3391:1976 :

Description / Abstract: 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.