Abstract
The selectivity of ISEs based on metalloporphyrins studied significantly depends on both the nature of the central atom of the metal–porphyrin complex and the nature and concentration of lipophilic ionic additives. A strong dependence of the ISE potential on the pH of a test solution is a distinctive feature of all studied metalloporphyrin-based ISEs. In this context, the use of metalloporphyrins functioning as neutral carriers of anions is preferable, because membranes based on them can be optimized using lipophilic cationic additives that simultaneously suppress the pH response. Electrodes based on metalloporphyrins that exhibit their own ion-exchange properties demonstrate a strong pH response in a wide range of pH; therefore, it is feasible to use them only in strongly buffered solutions.
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