Reference number
ISO 9504:1993
ISO 9504:1993
© ISO 2024
ISO 9504:1993
Metallurgical-grade fluorspar — Determination of antimony content — Solvent extraction atomic absorption spectrometric method
Edition 2
1993-04
1993-04
Withdrawn
Abstract
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 fumes of sulfuric acid, extracting the antimony 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 217,6 nm. Applies to products having an antimony content equal to or greater than 0,001 % (m/m).
Life cycle
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Previously
WithdrawnISO 9504:1990
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Now