The resolution of differential potentiometric stripping analysis has b
een evaluated in terms of the difference in the half-wave potentials,
the number of electrons involved in the electrode reactions and the co
ncentration ratio of the ions to be determined simultaneously. The asy
mmetry of the dt/dE vs. E function was found to affect the resolution
considerably. In other words the interference is considerably enhanced
when the half-wave potential of the interfering ion is more cathodic
than that of the measured one while in the reverse case the resolution
is much improved.