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Sequential probability ratio test for evaluating functionality in acid–base potentiometry

A procedure is proposed for evaluating the functionality of acids and bases using data from potentiometric titration. The sequential probability ratio test is used together with a numerical model involving the ionic strength varying during the course of the titration. As in all sequential procedures, the number and extent of titrant additions are a function of the probabilistic discrimination level reached after each addition. This involves an important saving of time and reagents. The procedure has been applied for distinguishing monofunctional from difunctional acids and bases in real and simulated experiments, and always gives very good results even in routine analysis.