Clinical Chemistry
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Clinical Chemistry 19: 891-894, 1973;
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Clinical Chemistry, Vol 19, 891-894, Copyright © 1973 by the American Association for Clinical Chemistry

An All Solid-State Electrochemical Electrolyte Analyzer

Melvin D. Smith 1, Robert W. Rogers 1, Marvin A. Genshaw 1, and Jerome Greyson 1

1 Physical Sciences Section, Ames Research Laboratory, Ames Co., Division Miles Laboratories, Inc., Elkhart, Ind. 46514.

Ion-selective electrodes have been applied to analysis of blood electrolytes with some success. However, currently available ion-selective electrode systems tend to be elaborate and expensive. We describe a clinical electrolyte analyzer in which inexpensive ion-selective electrodes are used. The electrodes are in the configuration of thin wires and are all solid in construction. They may be dipped directly into undiluted 250-µl samples of serum or plasma, are nondestructive of the sample, and may be used with an expanded-scale pH meter, although a more sensitive electrometer is preferred. The complete electrolyte analyzer consists of an electrode holder, into which the electrodes are plugged, and a solid-state digital electrometer that displays units of electrolyte concentration. A discussion of the thermodynamics essential to the construction of reversible electrodes is also presented, as well as the results of a clinical study in which it is shown that data from a flame photometer and the electrochemical analyzer compare favorably.


Key Words: sodium and potassium ion determination • ion-selective electrodes • emergency measurements • blood electrolytes

Submitted on March 23, 1973
Accepted on May 18, 1973






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Copyright © 1973 by the American Association for Clinical Chemistry.