Electrochemical Characteristics of Benzanthrone Studied via Cyclic Voltammetry: Charge Transfer Redox Processes

Kefa Karimu Onchoke, Antonio D. Trevino

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The electrochemical behavior of benzanthrone (BA), a known mutagen and carcinogen, and an environmental pollutant widely found in aerosol particulates, was studied on a platinum electrode using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) in 0.15 M tetrabutylammonium hexafluorophosphate-acetonitrile solution. At scan rates < 500 mV/s BA exhibited two well defined cathodic and anodic peaks at -1234.909 ± 5.605 mV, and -1158.9 ± 10.88 mV, respectively. The plot of peak currents (ip) versus ν1/2 scan rates were linear at ν < 200 mV/s and concentrations 0.5-2.0 mM indicating a diffusion controlled one electron transfer reaction. Higher scan rates (500 - 2000 mV/s) exhibited quasi-reversible reactions with ipa/ipc > 1.5. At scan rates > 500 mV/s, a plot of Ip versus ν1/2 deviates from linearity indicating quasi-reversible redox behavior. For all concentrations studied at scan rates < 200 mV/ the Ipa/Ipc ratios were 1.0650 ± 0.0091. The heterogeneous rate constant, k0, of the reversible diffusion-controlled reaction was determined as 3.51 x 10-5 ± 1.18 x 10-5 cm s-1. Via differential pulse voltammetry (DPV) the limit of detection, LOD ( 3s/m), on a bare platinum electrode was determined to be 1.69 x10-4 ± 1.5 x 10-5 M (for ipc) and 3.71 x 10-4 ± 3.56 x10-5 M (for ipa) at 200 mV/s.

Original languageUndefined/Unknown
JournalFaculty Publications
StatePublished - Mar 1 2019

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