Liquid-Junction Potentials between Plasma or Erythrolysate and KCl Solutions

Abstract

The change in the sum of the liquid-junction potentials of the junctions ‘test solution|KCl dilution|KCl saturated’ was measured as a function of the concentration of the KCl dilution. The results indicate that the junction potentials calculated by means of the Henderson equation are fairly reliable. For the junction ‘test solution|KCl saturated’ the values are of the same order of magnitude for the standard equimolar NBS phosphate buffer and plasma or erythrolysate, being approximately 2.9, 1.9, and 2.5 mV respec tively, at temperature 310 K.

Key Words:

• Calomel electrode
• electrometric analysis
• glass electrode
• hydrogen ion concentration
• liquid-junction potential
• potentiometric analysis