基于泡沫镍载纳米材料的电化学传感器检测肉制品中亚硝酸盐

Electrochemical Sensor Based on Nickel-Foamed Nanocomposites for Detecting Nitrite in Meat Products

摘要:

为实现对肉制品中亚硝酸盐灵敏测定，以泡沫镍为载体，采用水热合成法和高温煅烧法制备泡沫镍基负载Co₃O₄（Co₃O₄/Ni foam）纳米复合材料，用于构建高灵敏度亚硝酸盐电化学传感器。通过扫描电子显微镜(SEM)、高分辨透射电子显微镜(HRTEM)和X射线衍射(XRD)对所制备的纳米复合材料的形貌和结构进行表征。利用循环伏安法(cyclic voltammetry，CV)和计时安培滴定法进一步研究该修饰电极快速检测亚硝酸盐的电化学行为和电催化机理。结果表明，亚硝酸盐浓度在5~2 100 μmol/L时，传感器的峰电流与NO₂^-浓度呈现良好的线性关系，检测限为3.14 μmol/L。以酱牛肉为实际样品，通过标准加入法测定亚硝酸盐含量，加标回收率为97.9%~101.2%。该传感器具有容易制备、灵敏度高、易操作、稳定性好以及检测耗时短等优点，适用于肉制品中亚硝酸盐的快速检测。

Abstract:

In order to achieve the sensitive detection of nitrite in meat products, this study used nickel foam as the carrier and prepared nickel foam supported Co₃O₄ composite material by hydrothermal method and high-temperature calcination method, which was used to construct a highly sensitive nitrite electrochemical sensor. The morphology and structure of the prepared nanocomposites were characterized by scanning electron microscope(SEM), high-resolution transmission electron microscopy(HRTEM) and X-ray diffraction(XRD). Meanwhile, cyclic voltammetry(CV) and chronoamperometric titration were used to further study the electrochemical behavior and electrocatalytic mechanism of the modified electrode for rapid detection of NO₂^- ions. The results showed that the peak current of the sensor exhibited a good linear relationship with NO₂^- concentration in the range of 5~2 100 μmol/L, with a detection limit of 3.14 μmol/L. Using soy sauce beef as the real sample, the content of nitrite was determined by standard addition method, with a recovery range of 97.9% to 101.2%. The sensor has the advantages of easy preparation, high sensitivity, easy operation, good stability and short detection time. It is suitable for the rapid detection of nitrite in meat products.