MnO2 Based Bisphenol-A Electrochemical Sensor Using Micro-Fluidic Platform

Numerous industrial processes are based on the application of phenolic compounds such as Bisphenol-A (BPA), which is used as a monomer and additive in plastics, resins, and coatings manufacturing. Many phenolic compounds are highly toxic and responsible for high pollution in food, water, and soil. The endocrine disrupting activities of BPA makes it an emerging environmental pollutant. The most common source of BPA release into the environment is from plastic packaging. This leakage from plastic packaging is facilitated by heat and pH conditions which speeds up the hydrolysis of the ester bonds. In this paper, we report the estimation of BPA concentration in ethanol, using nanostructured manganese dioxide as a receptor using a nonfaradaic electrochemical impedance spectroscopy. An equivalent electrical circuit model has been proposed for electrochemical impedance data of BPA solutions in pure ethanol. A linear relationship of impedance response with the concentration over a range from 1 nM-62.5 μM is observed. The detection limit is estimated around to be 0.66 μM. During the measurement, it has been taken care that the electrodes must give excellent reproducibility.