Reference number
ISO 4284:1993
ISO 4284:1993
© ISO 2025
ISO 4284:1993
Acid-grade and ceramic-grade fluorspar — Determination of sulfide content — Iodometric method
Edition 3
1993-01
1993-01
Withdrawn
Abstract
The principle of the method specified is digestion of a test portion in a sealed apparatus in a mixture of hydrochloric acid, tin(II) chloride and boric acid solutions, absorption of the liberated hydrogen sulfide, entrained in a stream of oxygen-free argon or nitrogen, in zinc acetate solution and iodometric determination of the zinc sulfide formed. The method is applicable to products having a sulfide content equal to or greater than 0,001 % (m/m). It is not applicable, if presence of polysulfides is suspected.
Life cycle
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Previously
WithdrawnISO 4284:1978
WithdrawnISO 4284:1988
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Now