The Determination of Small Amounts of Fluorine in Glass

JSGT 1953 V37 T213-T220

In view of the increasing use of fluorine in glass batches it is necessary to have a rapid and accurate method for the determination of small amounts of this constituent. Two methods are here described, both of which give accurate and consistent results.  A volumetric method is used for amounts of fluorine from 0·5% upwards, and a colorimetric method described is capable of determining fluorine in the concentration of 1 part of fluorine in 2,000,000 of solution. In each case the glass is decomposed by a sodium carbonate fusion, and the fluorine is extracted by hot water, the residue being separated by centrifuging.

R. S. Allison