All-solid-state ion-selective electrodes (ASS-ISEs) often apply conducting polymers as ion-to-electron transducers, placed between ionic conductor - ion-sensing membrane and electron conductor - supporting material. This choice is justified by superior stability of the analytical signal - potential measured, a fact confirmed for numerous sensors of this type.

Recent advances in the field of internal solution ISEs, especially lowering the detection limit and improving obtainable selectivity coefficients set new standards of performance also for ASS-ISEs, with ultimate goal of making them competitive in terms of analytical parameters with the up today tailored internal solution ISEs.

The important step was identification of the processes related to the conducting polymer phase, influencing the detection limits and selectivities of ASS-ISEs. Thus, successful elimination of undesired effects was possible and yields all-solid-state sensors of performance well comparable with tailored internal solution electrodes of low detection limit and high selectivity. Various methods can be applied to obtain improved all-solid-state potentiometric sensors: these are related both to sensor pretreatment, method of measurement as well as modification of the transducer and choice of membrane ion-selective membrane material applied. All methods prove to be successful and result in more favorable sensors analytical parameters.

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