Towards stabilization of the potential response of Mn(III) tetraphenylporphyrin-based solid-state electrodes with selectivity for salicylate ions

Skripnikova, Tatiana A.; Ermolenko, Yuri E.; Starikova, Anna A.; Shumilova, Galina I.; Mourzina, Youlia; Pendin, Andrey A.

doi:10.1007/s10008-017-3575-6

Journal Article

FZJ-2017-06408

Towards stabilization of the potential response of Mn(III) tetraphenylporphyrin-based solid-state electrodes with selectivity for salicylate ions

Skripnikova, T. A. (Corresponding author) ; Starikova, A. A. ; Shumilova, G. I. ; Ermolenko, Y. E. ; Pendin, A. A. ; Mourzina, Y. (Corresponding author)FZJ*

2017
Springer Berlin

Journal of solid state electrochemistry 21(8), 2269 - 2279 (2017) [10.1007/s10008-017-3575-6]

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Please use a persistent id in citations: http://hdl.handle.net/2128/15930 doi:10.1007/s10008-017-3575-6

Abstract: We report a new type of solid-state electrode (type I) of a simple design with polyvinyl chloride membranes based on Mn(III) tetraphenylporphyrin and with graphite as the electronically conducting substrate. Enlargement of the membrane/graphite contact area by soaking graphite in the plasticizer with subsequent conditioning of the electrode at 30 °C allowed us to shorten the time required to achieve steady potential values of the sensors to just 3 days. These electrodes do not require a specially added RedOx system in the transducer layer. Stabilization of the EMF response of type I electrodes is compared to type II electrodes which contain a Cu0/Cu2+ RedOx couple in the transducer layer. Type I sensors are suitable for measuring the salicylate ion concentration in the clinically important concentration range down to 2.5 × 10−4 M with a sensitivity to salicylate ion of −59.0 mV decade−1 in solutions with a high constant background of chloride ions of 0.12 M at pH = 5.3, making this a promising technique for an effective design of solid-contact ion-selective electrodes with polymeric sensing membranes.

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