Potentiometric Titration by the Equi-potential Interval Method

As a modification for the two-point potentiometric titration,the equi-potential interval method was proposed in this paper.It was proved by mathematical derivation,that when P1 (ratio of V1 to Ve expressed in %;V1 is the volume of titrant consumed at the 1st point of measurement,and Ve is the volume of titrant consumed at the end-point of titration) achieved to a value of 95%,and the potential difference (ΔE) between the 2 points was greater than 30 mV,the relative error T would be less than 0.1%.Based on these facts,values of V and E were taken through the titration at intervals of ΔE of 30 mV,and the titration was concluded when the calculated values of T attained to ≤0.1%.Values of Ve and results of titration were calculated by the formula given.Results obtained in applying the present method to the potentiometric titration of neutralization,precipitation and redox reaction systems,were in consistency with the conventional potentiometric titration.