Abstract
This chapter discusses the determination of fluoride from silicate rock. Gravimetric and titrimetric procedures based upon the precipitation of lead chloro-fluoride are used in the analysis of samples containing appreciable quantities of fluorite but are not applicable to normal silicate and carbonate rocks. Fluorine may also be determined in silicate rocks using an ion-selective electrode. Fluoride-selective electrodes are now widely used for the determination of fluorine in silicate rocks. The chapter describes the spectrophotometric determination of fluorine. This photometric method is based upon the bleaching action of fluorine on the colored complex formed between zirconium and eriochrome cyanine R. The chapter also explains the pyrohydrolytic determination of fluorine. When fluorine containing minerals are heated in a stream of moist air, hydrolysis occurs and fluorine is evolved—probably as hydrogen fluoride. The complete evolution of fluorine can be achieved by the use of a suitable flux and an accelerator.
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