ION-SELECTIVE ELECTRODES - HISTORY AND CONCLUSIONS

The working mechanism of ion-selective electrodes has been investigate d. The contradictions of theories deduced from so-called analogous phe nomena are discussed in detail. Based on experiments made by the autho r's research group the conclusion was drawn that only the surface (the active groups located there) takes part in the potential-determining reaction and the bulk resistance of the membrane plays a role only in the selection of the instrument used for potential measurement.