1. Electrochemical determination of endrin from fruit juice samples based on Fe-doped ZnO nanomaterial modified glassy carbon electrode.
- Author
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Teshome, Toleshi, Kitte, Shimeles Addisu, Gonfa, Guta, and Gure, Abera
- Subjects
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CARBON electrodes , *FRUIT juices , *DOPING agents (Chemistry) , *NANOSTRUCTURED materials , *PEST control , *ORANGE juice , *PESTICIDES - Abstract
Pesticides have a vital role in agricultural production to control pests and maintain high product quality. However, they are potential pollutants, having harmful effects on humans, animals, and environments. Considering these issues, a fast, accurate, and efficient method to determine these pesticides is pivotal. In this study, iron-doped ZnO nanoparticles (Fe-ZnO NPs) were synthesized by the co-precipitation method, and used for the electrochemical determination of endrin pesticide in fruit juice samples. The synthesized materials were characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), Scanning electron microscopy (SEM), and UV–Vis spectroscopy. Then, Fe-ZnO-modified glassy carbon electrode (Fe-ZnO/GCE) was used to determine endrin and showed remarkable electro-catalytic properties and enhanced sensitivity for the determination of the target analyte. It was calculated that the diffusion coefficient (D) and kinetic rate constant (K) of endrin were 4.57 × 10−6 cm2 s−1 and 38.1 M−1 s−1, respectively at Fe-ZnO/GCE. It also exhibited a good linear response to endrin in concentrations ranging from 0.1 to 70 μM. The limit of detection (LOD) and limit of quantification (LOQ) of the method were 0.019 μM and 0.065 μM, respectively. Moreover, Fe-ZnO/GCE was selective for endrin analysis. It has also shown good sensitivity (2.16 µA/µM cm−2), long-term stability, good repeatability, and within-lab reproducibility. The practical utility of Fe-ZnO/GCE was applied for the determination of endrin in mango and orange juice samples. The relative recoveries of the real samples ranged from 91.4 to 106.5%. The developed method could be used as a good candidate for monitoring endrin pesticides in food samples. Schematic illustration of the preparation of Ni-polyaniline electrode for glucose sensing [ABSTRACT FROM AUTHOR]
- Published
- 2024
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