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Clinical Chemistry 14: 859-870, 1968;
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Clinical Chemistry, Vol 14, 859-870, Copyright © 1968 by the American Association for Clinical Chemistry

Ionic Activities of Sodium, Potassium, and Chloride in Human Serum

Harold Dahms 1, Robert Rock 1, and David Seligson 1

1 IBM Watson Research Center, Yorktown Heights, N. Y., and Section of Clinical Pathology, School of Medicine, Yale University, New Haven, Conn. 06510.

Ionic activities of sodium, potassium, and chloride in serums of 26 hospitalized patients were determined with ion-specific electrodes. Comparison of the activities with the corresponding concentrations shows that the two most important parameters influencing the molar activity coefficients of these ions are the water content of serum and the binding between albumin and chloride. Quantitative expressions for activity-concentration conversion factors are given. Calculations show that the conversion factors vary significantly in disease states due to changes in protein.

Submitted on January 17, 1968
Accepted on February 18, 1968






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Copyright © 1968 by the American Association for Clinical Chemistry.