Electrochemical sensor based on β-cyclodextrin incorporating ion-sensitive membrane for determination of m-cresol

Abstract

Due to their significantly harmful impact on the environment and human health, the qualitative and quantitative determination of cresols receives great attention. In this study, a highly sensitive and selective polymeric membrane incorporating β-cyclodextrin was prepared for the determination of m-cresol in aqueous medium. Impedance spectroscopic data for this impedancemetric sensor exhibits complex impedance over a range of frequencies (1 Hz–100 kHz) and is well-fitted with a proposed equivalent electrical circuit model. The effect of m-cresol on the high-frequency arc resistance is described by a linear law at all m-cresol concentrations, indicating the possibility of utilizing the impedance spectra as the main sensing signal. The linear range and the detection limit of the calibration curve are 1.79 × 10−12 to 1.94 × 10−2 g/L, 1.79 × 10−12 g/L, respectively. In addition to high selectivity for m-cresol, the sensor possesses a good working lifetime.