Voltammetric Nanostructure Based Sensor for Determination of Sudan I in Food Samples

摘要

Ionic liquid/CdO/NPs carbon paste electrode (IL/CdO/NPs/CPE) has been used as a high sensitivesensor for the professional quantitative determination of sudan I in food samples in aqueous solution.In the first step, CdO/NPs synthesis using chemical precipitation method and characterized withdifferent methods such as transmission electron microscopy (TEM) and X-ray diffraction (XRD). Thepropose sensor shows a better electrochemical response with lower over-potential and high sensitivityfor sudan I compared with unmodified carbon paste electrode using linear sweep voltammetry (LSV).The electro-oxidation of sudan I occurred in a pH-dependent eand H+ process, and the electrodereaction followed a diffusion-controlled pathway. Under the optimum conditions in square wavevoltammetry (SWV), the voltammetric oxidation peak current of sudan I showed linear dynamicranges with a detection limit of 0.05 M for sudan I. The modified electrode was successfully used forthe determination of the analytes in real samples with satisfactory result.