Determination of Fluoride in Atmospheric Samples by Ion Pair Reversed-Phase Chromatography

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Abstract
An ion chromatographic method for the separation of fluoride from organic acid anions, e.g., formate and acetate, is described. The method uses mobile phase ion chromatography (MPIC), i.e., the retention of ion pairs on a reversed-phase liquid chromatography column, to achieve the separation. Gradient elution using a 10 mM tetrabutylammonium hydroxide eluent yields complete separation of fluoride from formate and acetate. A linear response from the conductivity detector to fluoride has been obtained over the range 0.5 μM to 10 μM with a detection limit of 0.5 μM and a standard deviation of 3%. This method is demonstrated by the determination of fluoride in several atmospheric samples.

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