Reference number
ISO 5439:1978
ISO 5439:1978
Acid-grade fluorspar — Determination of available fluorine content — Potentiometric method after distillation
Edition 1
1978-09
Withdrawn
ISO 5439:1978
11485
Withdrawn (Edition 1, 1978)

Abstract

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 %.

General information

  •  : Withdrawn
     : 1978-09
    : Withdrawal of International Standard [95.99]
  •  : 1
     : 6
  • ISO/TC 175
    73.080 
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