Miniature potentiometric system for determination of H+, K+, Na+, Сl–, NO – - and Ca2+ ions in liquid biological environment

Biophysics and medical physics
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Abstract:

An intelligent potentiometric system for the analysis of liquid biological environments has been developed and researched. The system consists of a set of 6 miniature measuring cells, including polyvinylchloride-membrane electrodes, selective to the presence of H+, K+, Na+, Ca2+, Cl, NO ions in the analyzed solutions, and one central ‘reference’ cell with a chlorosilver reference electrode. For potentiometric measurements of the voltages of our system, an eight-channel analog-to-digital converter was used, which receives a signal from the down conductor of each of the measuring cells and the central ‘reference’ cell. This system was tested with aqueous solutions of НCl, KCl, NaCl, NaNO3 and CaCl2 at concentrations from 10–1 to 10–5 M. This confirmed the usefulness of the developed potentiometric multisensor system for the analysis of the ionic composition of biological environment.