Abstract
A method for the microdetermination of fluoride in the presence of phosphate is described. Up to a 10-fold excess of phosphorus (as phosphate) can be tolerated. Phosphate is adsorbed on zinc oxide which is added in excess and need not be removed prior to titration of fluoride. Fluoride is determined potentiometrically with 0.02M lanthanum(III) at pH 5 to 7. A fluoride ion specific electrode is used with an expanded-scale pH meter to monitor the emf.
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