Potassium Ion Specific Electrode with High Selectivity for Potassium over Sodium

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Science  13 Feb 1970:
Vol. 167, Issue 3920, pp. 987-988
DOI: 10.1126/science.167.3920.987


A new potassium electrode, made from valinomycin, which uses commercially available electrode configurations, responds to potassium ion concentrations from 1 mole per liter to below 10-6 mole per liter. It is highly selective for potassium ion over sodium ion and divalent ions and can be used for the direct determination of potassium ion in human serumn. No significant complexing of potassiium appears to occur in normal seruin.

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