Fluoride Determination in Water: An Optimum Buffer System for Use with the Flouride-Selective Electrode

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Abstract
The departure from linear response which often occurs at dilute fluoride concentrations of the calibration curve reduces the sensitivity of the electrode. The linear portion of the standard curve may be extended to lower fluoride levels by dilution of the buffer itself. TISAB III M. tri-Ammonium citrate (TAC) is the superior of the eleven buffer systems examined in terms of masking ability. Of the potentially interfering species studied, only Al and Mg pose interference problems.