Reference number
ISO 5439:1978
© ISO 2025
ISO 5439:1978
Acid-grade fluorspar — Determination of available fluorine content — Potentiometric method after distillation
Edition 1
1978-09
Withdrawn
Withdrawn (Edition 1, 1978)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

  • Status
     : Withdrawn
    Publication date
     : 1978-09
    Stage
    : Withdrawal of International Standard [95.99]
  • Edition
     : 1
    Number of pages
     : 6
  • Technical Committee :
    ISO/TC 175
    ICS :
    73.080 
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