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ISO 4284:1993

Acid-grade and ceramic-grade fluorspar — Determination of sulfide content — Iodometric method

Jan 21, 1993
95.99   Withdrawal of Standard   Mar 3, 2010

General information

95.99     Mar 3, 2010

ISO

ISO/TC 175

International Standard

73.080  

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Scope

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

PREVIOUSLY

WITHDRAWN
ISO 4284:1978

WITHDRAWN
ISO 4284:1988

NOW

WITHDRAWN
ISO 4284:1993
95.99 Withdrawal of Standard
Mar 3, 2010