Study of acetylsalicylic acid electroreduction behavior at platinum electrode

Electroreduction behavior of acetylsalicylic acid (ASA) was investigated at platinum electrode using the cyclic voltammetry method. An effect of scan rate, ASA concentration and pH on electrode reaction was determined. The process is diffusion-controlled. Parameters of ASA electroreduction, i.e., rate constant, charge transfer coefficient and diffusion coefficient, were calculated. The ASA electroreduction is quasi-reversible and proceeds in two steps. This process is preceded by substrate hydrolysis resulting in the formation of salicylic (SA) and acetic (AA) acid. Hydrolysis products are electrochemically reduced. In the first and second step, electroreduction of SA and AA proceeds, respectively. Possible mechanism of ASA electroreduction was proposed.