Abstract
A very sensitive electrochemical method for trace measurement of fluoride in water is discussed. The complex of cerium(III) with alizarin complexone (ALC) and fluoride ion is adsorbed at the dropping mercury electrode. In cathodic sweeps, the peak height is directly proportional to the concentration of fluoride over the range 8 × 10 −8-5 × 10 −6 M (1.5 × 10 −9–9.5 × 10 −8 g/ml), and the detection limit is 5 × 10 −8 M (9.5 × 10 −10 g/ml). The proposed method was applied to the determination of fluoride in water.
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