Determination of Fluorine in Quantitative Organic Microanalysis

Abstract

Determination of fluorine in organic microanalysis has become increasingly important because of the large number and variety of organic fluoro compounds being synthesized.

Determination of Organically Bound Fluorine Using Sodium Biphenyl Reagent and a Fluoride-Specific Ion Electrode

“…Therefore, compounds that required heating to attain at least 0.1 % solubility by weight in tetrahydrofuran or ethylene glycol dimethyl ether were first dissolved in a small amount of dimethyl sulfoxide and then diluted with tetrahydrofuran or ethylene glycol dimethyl ether. Sodium Biphenyl Reaction-Although the mechanism of the reaction is not well documented, it is believed that decomposition of organo-fluoro compounds with sodium biphenyl reagent involves reductive cleavage of the bound fluorine (31,37). The reaction is apparently instantaneous at room temperature, since no significant differences in fluorine recoveries were observed for reaction periods of 1-30 min.…”

Sample preparation for low-level, .alpha.-particle spectrometry of radium-226

“…20640 Quantitative decomposition of organic fluorine compounds is often extremely difficult. Fusion with metallic sodium or potassium in a nickel bomb is often recommended as the most universally effective method (5). The oxygen flask combustion has also been applied successfully (3).…”

Indirect polarographic microdetermination of fluorine in fluoroorganic compounds after oxygen-flask combustion

“…F-+ Pb(N03)2 + Cl" -*-PbCIF | + 2NOf (1) Pb2* + 2e ->-Pb (2) In the other method, F_ is reacted with calcium iodate, CaCIOsla, and the cathodic reduction wave of the free IO3liberated is measured polarographically. The precipitation and redox reactions involved may be expressed as follows:…”