The interaction of organic cationic complex particle tannin-Ва2+ with heteropolyanion of Keggin structure РМо12О403- was investigated with the help of spectrophotometric method. These slightly soluble associates were used as electrode active substances (EAS) in plasticized polyvinyl chloride (PVC) membranes of ion-selective electrodes (ISE), sensitive to organic cationic complex particle tannin-Ва2+. Based on the experimental data, a new method of tannin determination in industrial products and oak bark extract by direct potentiometry with the help of ISE was developed.
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