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ISO 5439:1978
ISO 5439:1978 Acid-grade fluorspar -- Determination of available fluorine content -- Potentiometric method after distillation
standard by International Organization for Standardization, 09/01/1978
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M00050433
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Full Description
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 %.
