Redox Buffer Capacity of Ion-Selective Electrode Solid Contacts Doped with Organometallic Complexes

Analytical Chemistry
Xue V ZhenPhilippe Bühlmann

Abstract

While ion-selective electrodes (ISEs) with inner filling solutions are used widely, solid-contact ISEs are better suited for miniaturization and mass manufacturing. Calibration-free measurements with such electrodes require the reproducible control of the phase boundary potential between the ion-selective membrane and the underlying electron conductor. The most promising approach to achieve this goal is based on redox buffers incorporated into the ion-selective membrane. Here we introduce the theory and present experimental data for Co(III), Co(II), Ru(II), Fe(II), and Os(II) compounds that show quantitatively how the phase boundary potential at a solid contact doped with redox-active compounds is affected by weighing errors, reagent impurities, and redox-active interferents. Perhaps surprisingly, theory predicts that there is only a minimal dependence of the phase boundary potential on the ratio of the concentrations of a pure oxidized and a pure reduced compounds if those two compounds are not a redox couple. However, theory predicts that even small redox-active impurities of those compounds shift the phase boundary potential drastically. Experimentally, a surprisingly good in-batch reproducibility was observed by us and othe...Continue Reading

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Citations

Sep 12, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ziqi SunLijuan Kou
Oct 28, 2020·Analytical Chemistry·Elena Zdrachek, Eric Bakker
Dec 22, 2021·Analytical Chemistry·Celeste R RousseauPhilippe Bühlmann
Dec 28, 2021·Analytical Chemistry·Elena ZdrachekEric Bakker

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