Abstract
The present study developed a facile and fast electrochemical approach to sensitively analyze Sudan I using Fe3O4-ZIF-67 nanocomposite plus ionic liquid (IL). The carbon paste electrode (CPE) modified with Fe3O4-ZIF-67/IL exhibited an excellent electrochemical sensing performance to Sudan I. Compared with the unmodified CPE, Fe3O4-ZIF-67/ILCPE could significantly increase the peak current of Sudan I oxidation and decrease the oxidation overpotentials. Under the best experimental conditions, the sensor using differential pulse voltammetry (DPV) technique responded to Sudan I linearly (0.5 - 560 μM) with a low limit of detection (LOD) of 0.1 μM. Additionally, the applicability and effectiveness of our proposed method in sensing Sudan I present in food samples was confirmed by acceptable recovery rate (96.0 - 103.6 %).
Highlights
Chemicals and instrumentationsElectrochemical experiments were recorded using a PGSTAT-302N Autolab potentiostat/galvanostat (Eco Chemie, The Netherlands)
The present study developed a facile and fast electrochemical approach to sensitively analyze Sudan I using Fe3O4-Zeolitic imidazolate frameworks (ZIFs)-67 nanocomposite plus ionic liquid (IL)
A relatively wide and weak peak current (Ipa) of Sudan I oxidation was found on the unmodified carbon paste electrode (CPE), which reveals that the electrochemical oxidation does not happen spontaneously due to high activation overpotential
Summary
Electrochemical experiments were recorded using a PGSTAT-302N Autolab potentiostat/galvanostat (Eco Chemie, The Netherlands). Electrochemical experiments were performed by a three-electrode system containing modified or unmodified CPE as working electrode, Ag/AgCl (3M KCl) as a reference electrode, and platinum wire as a counter (auxiliary) electrode. The Fe3O4-ZIF-67 nanocomposite was synthesized according to a simple method as reported in our recent work [30]. The surface area of the Fe3O4-ZIF-67/ILCPE and the bare CPE were obtained by CV using 1 mM K3Fe(CN) at different scan rates. Using the Randles-Sevcik formula for Fe3O4-ZIF-67/ILCPE, the electrode surface was found 0.288 cm, about 3.2 times greater than bare CPE
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