| Autor: |
Zhang, Yi, Wu, Yanqing, Su, Lishen, Zhu, Chunlin, Wu, Xiaoping |
| Zdroj: |
Analytical Methods; 2022, Vol. 14 Issue: 23 p2329-2336, 8p |
| Abstrakt: |
The inclusion of methylmercury (CH3Hg+) in the environment and food chain has aroused wide concern due to its high neurotoxicity and cumulative effects. Herein, a highly sensitive electrochemical sensor based on manganese dioxide (MnO2)/gold nanoparticles (AuNPs) composites is fabricated for CH3Hg+detection in food. The MnO2/AuNPs nanocomposites were synthesized in situon the surface of a glassy carbon electrode by an electrodeposition method and were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The resulting MnO2/AuNPs modified electrode exhibited a large active surface area, enhanced conductivity and excellent electrocatalytic activity toward CH3Hg+due to the synergistic effect of MnO2and AuNPs. Square wave anodic stripping voltammetry (SWASV) was used as the sensing technique for CH3Hg+, and the stripping peak current showed a good linear relationship with CH3Hg+concentration in the range of 0.7–15 μg L−1with a detection limit of 0.051 μg L−1. Besides, the interference from Hg2+associated with CH3Hg+detection can be avoided by the addition of diethylene triamine pentaacetic acid (DTPA). The as-prepared sensor was applied to detect CH3Hg+in various food samples with satisfactory recoveries, thus providing a promising platform for rapid screening of methylmercury residues. |
| Databáze: |
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