Withdrawn
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 %.
WITHDRAWN
ISO 5439:1978
95.99
Withdrawal of Standard
Mar 3, 2010
Acid-grade fluorspar — Determination of available fluorine content — Potentiometric method after distillation
95.99 Withdrawal of Standard