Abstract
The most effective conditions for masking aluminium in the determination of μg/1. levels of fluoride in water by ion-selective electrode potentiometry after co-precipitation with aluminium phosphate have been re-examined. The effectiveness of citrate for masking aluminium increases with pH, and up to 1.5 × 10 −2 M aluminium can be masked quantitatively at pH 8.5. Fluoride (5–100 μg in 500 ml of sample solution) is quantitatively co-precipitated at pH 4.7 with ∼ 90 mg of aluminium phosphate. After dissolution of the precipitate and adjustment of the solution to pH 8.5 with TISAB, the fluoride content can be measured with a fluoride ISE. The method is simple and rapid, and is suitable for the determination of trace amounts of fluoride in various water samples.
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