ISO 5439:1978
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Acid-grade fluorspar Determination of available fluorine content Potentiometric method after distillation
Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users
05-03-2019
English, French
01-09-1978
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 %.
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