ION-SELECTIVE ELECTRODES BASED ON CALCIUM HYDROXYLAPATITE AS A TOOL FOR ANALYSIS OF VARIOUS ENVIRONMENTAL OBJECTS, FOOD AND RAW MATERIALS

Abstract

A method of  the potentiometric determination of Ca²⁺and HPO₄^2-ions in some food and raw products using the original ion-selective electrodes with calcium hydroxylapatite has been developed. The plasticized ion-selective electrodes  were constructed of calcium hydroxylapatite  on  PVC substrate. Investigation  of  the  electrode characteristics  proved  the  linear parts  on  the  Ca²⁺and HPO₄² V-A dependencies. The slope coefficients also were calculated for the both ions. Preliminary treatment of the electrodes in the Ca²⁺solutions results in significant changes in the both slope coefficients, which approach to the theoretical values.