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ISO 5439:1978

Acid-grade fluorspar — Determination of available fluorine content — Potentiometric method after distillation

Publication date:   Sep 1, 1978

95.99   Withdrawal of Standard   Mar 3, 2010

General information

95.99   Withdrawal of Standard   Mar 3, 2010

ISO

ISO/TC 175 Fluorspar

International Standard

73.080   Non-metalliferous minerals

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Scope

Specifies a potentiometric method using a fluoride-ion sensitive electrode. After destillation of fluorine from the test portion in the presence of perchloric acid the distillate shall be titrated with lanthane nitrate solution. Applicable to products having a calcium fluoride content greater than 90 %.

Life cycle

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ISO 5439:1978
95.99 Withdrawal of Standard
Mar 3, 2010