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We describe the voltammetric behavior of an anion-exchange membrane, hexamethyl-p-terphenyl poly(benzimidazolium) (HMT-PMBI). The anion-exchange properties of HMT-PMBI chemically modified electrodes were investigated using K 4 Fe(CN) 6 and K 2 IrCl 6 as redox probes. The permselectivity properties of HMT-PMBI chemically modified electrodes were ascertained using tris(2-2')bipyridyl-ruthenium(II) chloride Ru(bpy) 3  2+ . Cyclic voltammetry and chronoamperometry were utilized to extract parameters such as the concentration of the redox mediators inside the films and the apparent diffusion coefficients. We found the concentration of K 4 Fe(CN) 6 and K 2 IrCl 6 redox species within HMT-PMBI-coated films to be on the order of 0.04-0.1 mol·dm -3 , and values of D  app ca. 10 -10 -10 -9 cm 2 ·s -1 . To evaluate the possibility of using such a polymer coating in electroanalysis, HMT-PMBI-modified electrodes were utilized for the voltammetric detection of uric acid in artificial urine, Surine ® and ascorbic acid in Vitamin C samples. The results showed that HMT-PMBI-coated electrodes can detect uric acid in Surine ® with a limit of detection (LoD) of 7.7 µM, sensitivity of 0.14 µA·µM -1 ·cm -2 , and linear range between 5 μM and 200 μM, whereas for Vitamin C tablets, the LoD is 41.4 µM, the sensitivity is 0.08 µA·µM -1 ·cm -2 , and the linear range is between 25 μM and 450 μM.

sensors

Voltammetry at Hexamethyl-P-Terphenyl Poly(Benzimidazolium) (HMT-PMBI)-Coated Glassy Carbon Electrodes: Charge Transport Properties and Detection of Uric and Ascorbic Acid