普鲁士蓝/石墨烯修饰电极检测酱油中的亚硝酸盐

利用电化学沉淀普鲁士蓝纳米粒子在石墨烯的表面,采用差分脉冲伏安法对该电极进行表征,并研究亚硝酸根离子在修饰电极上的电化学行为。结果表明:在0.10 mol/L磷酸盐缓冲液(pH 7.0)中,亚硝酸根在1×10-6~1×10-2 mol/L浓度范围内呈线性关系,信噪比为3时检出限为3×10-8 mol/L。所构建的普鲁士蓝/石墨烯修饰电极对亚硝酸根离子具有良好的电催化活性,表现出良好的稳定性、重复性和抗干扰能力,同时将所构建的复合材料修饰电极应用于酱油中亚硝酸盐的检测。

Detection of Nitrite in Soy Sauce Using a Prussian Blue/Graphene Modified Electrode

In this work, we prepared graphene-based nanocomposite material by electrochemically depositing Prussian blue (PB) nanoparticles on the surface of graphene. Differential pulse voltammetry (DPV) was used to characterize the electrode and study the electrochemical behavior of nitrite ion on the modified electrode, and the electrode was used to detect nitrite in soy sauce. The results showed that the Prussian blue/graphene modified electrode had a good electrocatalytic activity to nitrite ion in 0.10 mol/L PBS buffer solution (pH 7.0). In the concentration range of 1 × 10-6-1 × 10-2 mol/L, the method presented a linear relationship. The limit of detection (LOD) was 3 × 10-8 mol/L at a signal-to-noise ratio of 3. The Prussian blue/graphene modified electrode showed a good stability, reproducibility and anti-interference ability.