Electroanalytical measurements without electrolytes: Conducting polymers as probes for redox titration in non-conductive organic media

Electroanalytical methods have been applied only in conducting media. An application of conducting polymers allows to overcome this limitation. If such material is in electrochemical equilibrium with dissolved redox active species, its electrical conductivity depends on the redox potential of these species. Therefore, conductometric measurements with conducting polymers can provide about the same information as classical redox electrodes. The approach was applied for redox titration. Equivalent points obtained by this titration in aqueous and organic electrolytes were identical. Then the approach was applied for determination of bromine number by redox titration in non-conducting organic phase.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Electroanalytics in non-conducting media. ► Chemiresistors based on conducting polymers as quantitative redox sensors. ► Simultaneous conductometry with chemiresistor and redox potentiometry. ► A unique possibility to measure redox-potential in gases and nonconducting liquids. ► An application for redox-titration in non-conducting organic phase is demonstrated.