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Clinical Chemistry 16: 103-106, 1970;
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Clinical Chemistry, Vol 16, 103-106, Copyright © 1970 by the American Association for Clinical Chemistry

Direct Potentiometric Measurement of Potassium in Blood Serum with Liquid Ion-Exchange Electrode

W. M. Wise 1, M. J. Kurey 1, and G. Baum 1

1 Research and Development Laboratories, Corning Glass Works, Sullivan Park, Corning, N. Y. 14830.

A new liquid ion-exchange electrode is described which has a selectivity for K+ over Na+ of 93:1 in 0.1 mol/kg solutions. Its response is Nernstian in the range 5 x 10-4 to 5 x 10-1 mol KCl per kg. The dip-type electrode responds to small changes in K+ in mixed salt solutions containing the same quantities of KCl and NaCl as human blood serum. A miniaturized form of the electrode was adapted to a capillary flow-through system for blood sera. It gives results for K+ in the normal range that agree with flame photometric values without correction for Na+ in the concentrations normally present. The effect of pH on the K+ response and the response of the electrode to Mg++, Ca++, NH4+, Rb+, and Cs+ are also illustrated.

Accepted on November 10, 1969






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Copyright © 1970 by the American Association for Clinical Chemistry.