Abstract
The development of a novel ion chromatography method for the determination of trace fluoride is described. The principle depends on the formation of the chromatographically stable AlF 2+ species in the presence of excess aluminium. Very high sensitivity is achieved with fluorescence detection, giving a detection limit of 0.2 μg l −1. Linear calibrations were achieved up to 400 μg l −1 fluoride in the presence of 5 mg l −1 excess aluminium. Magnesium interferes in relatively large amounts but can be controlled by adjustment of post-column reaction pH. Results for fluoridated drinking waters agree well with those obtained by the ion selective electrode technique.
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