An ultrasensitive electrochemical sensor based on in situ synthesized manganese dioxide/gold nanoparticles nanocomposites for rapid detection of methylmercury in foodstuffs. Issue 23 (1st June 2022)

• Record Type: Journal Article
• Authors: Zhang, Yi; Wu, Yanqing; Su, Lishen; Zhu, Chunlin; Wu, Xiaoping
• Is Part Of: Analytical methods. Volume 14:Issue 23(2022)
• Page Start: 2329
• Page End: 2336
• Publication Date: 2022-06-01
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/d2ay00417h
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : A highly sensitive and selective electrochemical sensor for rapid detection of methylmercury in foodstuffs using in situ synthesized manganese dioxide/gold nanoparticles nanocomposites as an enhanced sensing strategy. Abstract : The inclusion of methylmercury (CH3 Hg + ) 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 CH3 Hg + detection in food. The MnO2 /AuNPs nanocomposites were synthesized in situ on 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 CH3 Hg + due to the synergistic effect of MnO2 and AuNPs. Square wave anodic stripping voltammetry (SWASV) was used as the sensing technique for CH3 Hg +, and the stripping peak current showed a good linear relationship with CH3 Hg + concentration in the range of 0.7–15 μg L −1 with a detection limit of 0.051 μg L −1 . Besides, the interference from Hg 2+ associated with CH3 Hg + detection can be avoided by the addition of diethylene triamine pentaacetic acid (DTPA). The as-prepared sensor was applied to detect CH3 Hg + in various food samples with satisfactory recoveries, thus providing a promising platform for rapid screening of methylmercury residues.