Reference number
ISO 4283:1993
ISO 4283:1993
© ISO 2024
ISO 4283:1993
All grades of fluorspar — Determination of carbonate content — Titrimetric method
Edition 3
1993-01
1993-01
Withdrawn
Abstract
The principle of the method specified is treatment of a test portion with hydrochloric acid solution, absorption of the evolved carbon dioxide in barium hydroxide solution, neutralization of excess alkali with hydrochloric acid solution, addition of an exactly measured excess of a standard volumetric hydrochloric acid solution to dissolve the precipitated barium carbonate and back-titration with a standard volumetric sodium hydroxide solution using methyl orange as indicator. The method is applicable to products having carbonate contents equal to or greater than 0,04 % (m/m).
Life cycle
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Previously
WithdrawnISO 4283:1978
WithdrawnISO 4283:1990
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Now