Abstract
The construction and performance characteristics of ion-selective PVC membrane electrodes for metoprolol, propranolol and timolol are described. The electrodes, based on ion-pair complexes with dinonylnaphthalenesulphonate or with tetra(2-chlorophenyl)borate show near-Nernstian responses down to 10 −5 M drug concentration. Their selectivity relative to various inorganic and organic cations is reported. Direct potentiometry is used to determine beta-blocker drugs both in aqueous solutions and pharmaceutical preparations, with good results.
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