Sensitive electrochemical determination of salicylic acid at the surface of a new nano ceramic modified electrode

چکیده مقاله

Salicylic acid (o-hydroxybenzoic acid) (SA), that is one of an organic micro-molecular compound is widely present in various plants [1]. SA is a biological substance that acts as a phytohormone and plays an important role in the regulation of many physiological processes in plants such as flowering, heat production, seed germination, stomatal closure, membrane permeability and ion absorption [2]. So it is important to accurately and sensitively detect SA levels. In the present work, the electrochemical oxidation of SA has been studied using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques at the surface of a nickel nanoparticles modified carbon paste electrode. The characterization of the modified electrode was studied using different methods such as scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and CV. Also for electrochemical studies of SA various electrochemical techniques such as chronoamperometry, chronocoulometry and linear sweep voltammetry (LSV) were applied. The modified electrode exhibited excellent electrocatalytic activity towards the oxidation of SA. After optimizing the experimental conditions, the anodic peak current of SA showed a linear correlation to its concentration in a broad linear dynamic range with low limit of detection. Also the modified electrode presented a good stability and repeatability toward the determination of SA. The results indicated that the nanostructured modified electrode could be employed for the determination of SA in real samples with satisfactory results.