Ready-to-use Nafion-Bi2O3 modified graphite paper/gel electrode for the detection of lead in vegetables and fruits and its anti-interference performance

IF 8.5 1区农林科学 Q1 CHEMISTRY, APPLIED

Food Chemistry Pub Date : 2025-05-21 DOI:10.1016/j.foodchem.2025.144861

Huili Luo , Yilu Huang , Yuhang Xiang , Ying Zhou , Jia Zhao , Lijuan Chen

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引用次数: 0

Abstract

Electrochemical detection has been used to measure heavy metals in food, but matrix interferences remain limited the rapid treatment-detection. This study developed a Nafion-Bi₂O₃ coating modified graphite paper/sodium alginate gel electrode to amplify the electrical signal of Pb(II) and improve the anti-interference towards organic acids and metal ions. Although negatively charged organic acids were excluded by Nafion, interferences of exchangeable ions were amplified. In the mix drip coating, Bi₂O₃ was chemical combined and electrostatic interacted with OH, SO₃⁻ and C-S in Nafion. This modification reduced diffusion resistance, enhanced surface hydrophobicity and provided additional reactive oxygen binding sites. The peak current of Pb(II) increased 56.62 % and the detection limit was lowered to 0.015 μg/L. The recoveries of Pb in matrices were 78.33 %–106.45 %. The easy field modified graphite paper electrode represents an innovation, and this study will propel the rapid detection of heavy metals based on acid-extraction.

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即用型Nafion-Bi2O3改性石墨纸/凝胶电极用于蔬菜和水果中铅的检测及其抗干扰性能

电化学检测已被用于食品中重金属的检测，但基体干扰仍然限制了快速处理检测。本研究开发了一种Nafion-Bi2O3涂层改性石墨纸/海藻酸钠凝胶电极，以放大Pb（II）的电信号，提高对有机酸和金属离子的抗干扰能力。虽然Nafion排除了带负电荷的有机酸，但交换离子的干扰被放大了。在混合滴漏涂层中，Bi2O3与OH、SO3−和C-S发生化学结合和静电相互作用。这种修饰降低了扩散阻力，增强了表面疏水性，并提供了额外的活性氧结合位点。Pb（II）的峰值电流提高56.62 %，检出限降低至0.015 μg/L。Pb在基质中的回收率为78.33 % ~ 106.45 %。简单的现场修饰石墨纸电极是一项创新，该研究将推动基于酸萃取的重金属快速检测。

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来源期刊

Food Chemistry 工程技术-食品科技

CiteScore

16.30

自引率

10.20%

发文量

3130

审稿时长

122 days

期刊介绍： Food Chemistry publishes original research papers dealing with the advancement of the chemistry and biochemistry of foods or the analytical methods/ approach used. All papers should focus on the novelty of the research carried out.