Abstract
A microelectrode for the determination of oxygen dissolved in biologically active liquids by an electrochemical method has been developed, the sensitive material of which is nanodispersed titanium oxide, modified by Pt. The kinetics of oxygen electroreduction at TiO2 electrodes in blood plasma and sorbilactum solution have been investigated. It has been found that at cathodic potentials of -0.5 to -1.0 V (with respect to silver-chloride electrode) dependence of oxygen reduction current on concentration of oxygen in the rangeNI2 = (0,9÷4,6) ∙10-2 g∙l -1 was linear and passed through the beginning of coordinates. It has been shown that the number of electrons at the discharge stage in the oxygen reduction reaction is n=1, and that the total number of electrons in the reaction is ns ≈2. The electrodes investigated were distinguished by a high reproducibility of characteristics in longtime cycling and promise much for use in oxygen electrochemical sensors for biologically active liquids.
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