Abstract
Extensive studies of the molecular parameters of ion-selective antibiotics (26, 29) and synthetic ion-carriers (1, 23, 25, 26), and model calculations of the interaction of hard cations with electrically neutral compounds (12, 13) formed the framework for the development of a variety of ion-selective ligands (11). These have been used successfully as ion-selective components in liquid membrane electrodes (10, 14). Today, for the potentiometric measurement of the activity of alkali- and alkaline earth metal cations, neutral carrier baged electrodes with selectivity for Li+ (4, 28), Na+ (5, 27), K+ (17, 21), Ca2+ (24, 30), and Ba2+ (6) are available. These membrane electrodes are now widely used, especially in physiology (7) and medicine (10). In these areas a Mg2+ -selective electrode would be of great interest. In the following, the design features of a Mg2+ -selective ligand are briefly discussed and a new solvent polymeric membrane electrode with just sufficient Mg2+ -selectivity for intracellular studies is presented.
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