Abstract
A rapid, simple and accurate method for the determination of fluoride in mineral and rock samples in the range above 100 ppm is described. The samples are fused with Na 2CO 3 + K 2CO 3 and the fluoride is directly determined in the solution of the melt after a 1:10 dilution with a special conditioning solution (1 M Na citrate, 1 M NcCl, 0.05 M CDTA, pH 6.0) using a fluoride-selective electrode and a standard addition technique. Because of the elimination of any separation procedures, this method is faster and reduces the possibility of loss of F. Analyses of pure CaF 2 and international reference materials show the excellent accuracy from 0.7 to 3% by this inexpensive method, with a standard deviation of less than 4% (e.g., for a fluoride content of 48.67% in CaF 2).
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