Abstract
Abstract Two methods of calculation for the determination of an unknown concentration by gravimetric multiple standard addition analysis using ion selective potentiometry without prior calibration of the electrode have been described. These are based on simple calculation procedures involving linear least square fitting to Gran's equation to evaluate first the actual electrode slope ‘in situ’, then the unknown concentration and the cell constant. One method is iterative and the other is noniterative. The applicability of the methods has been demonstrated by processing the experimental data obtained by using fluoride and uranyl ion selective electrodes.
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