AbstractThe authors describe a screen-printed electrode (SPE) modified with a composite consisting of Mn3O4 microcubes and thin sheets of graphene oxide for use in amperometric determination of nitrite. The composite was prepared by a hydrothermal method, and its morphology, elemental composition, diffraction, impedance and electrochemical properties were studied. The modified SPE displays excellent electrocatalytic activity towards nitrite, and the oxidation peak current (measured typically at 0.70 V vs. Ag/AgCl) is related to the concentration of nitrite in the range between 0.1 and 1300 μM, with a 20 nM detection limit. The method was successfully applied to the determination of nitrite in spiked samples of beef and water. Graphical abstractElectrochemical determination of nitrite using graphene oxide nanosheets/Mn3O4 microcubes composite modified screen-printed electrode

中文翻译：

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用由氧化石墨烯纳米片和 Mn3O4 微立方体制备的复合材料修饰的丝网印刷电极用于亚硝酸盐的超灵敏测定

摘要作者描述了一种用由 Mn3O4 微立方体和氧化石墨烯薄片组成的复合材料改性的丝网印刷电极 (SPE)，用于亚硝酸盐的电流测定。采用水热法制备了复合材料，并对其形貌、元素组成、衍射、阻抗和电化学性能进行了研究。改进后的 SPE 对亚硝酸盐显示出优异的电催化活性，氧化峰值电流（通常在 0.70 V vs. Ag/AgCl 下测量）与 0.1 到 1300 μM 范围内的亚硝酸盐浓度有关，检测限为 20 nM。该方法已成功应用于牛肉和水加标样品中亚硝酸盐的测定。