Novel composite of reduced graphene oxide/zirconium hexacyanoferrate (rGO/ZrHCF) was fabricated via electrochemical deposition and used as a sensor for detecting sodium nitrite and ferulic acid. The sensor was thoroughly characterized using scanning electron microscope, DRS-UV, attenuated total reflection IR spectroscopy as well as atomic force microscopy. The rGO/ZrHCF exhibited cube-like morphology of ZrHCF on multilayered rGO sheets. Electrochemical characterization was carried out using cyclic voltammetry and square wave voltammetry for the detection of ferulic acid and sodium nitrite. Ferulic acid and sodium nitrite are used as food additives and the overdose of either of them can result in various physiological ailments and necessitates their detection. The proposed sensor could detect both sodium nitrite and ferulic acid at nanomolar levels exhibiting linearity in the range of 1.14 to 13.77 nM and 3.23 to 41.98 nM, respectively. The corresponding limit of detection was 0.38 nM and 1.39 nM. The rGO/ZrHCF-modified electrode was checked for real sample analysis by carrying out determination of sodium nitrite and ferulic acid in water and milk samples and the recovery percentages were found to be in between 96.15 and 99.80. The sensor exhibited long-term stability and reproducibility.

通过电化学沉积制备了新型的氧化石墨烯/六氰合铁酸锆（rGO / ZrHCF）复合材料，并用作检测亚硝酸钠和阿魏酸的传感器。使用扫描电子显微镜，DRS-UV，衰减全反射红外光谱以及原子力显微镜对传感器进行了全面表征。rGO / ZrHCF在多层rGO片材上显示ZrHCF的立方体状形态。使用循环伏安法和方波伏安法进行电化学表征，以检测阿魏酸和亚硝酸钠。阿魏酸和亚硝酸钠被用作食品添加剂，它们中的任何一种过量都可能导致各种生理疾病，并需要对其进行检测。所提出的传感器可以检测纳摩尔浓度的亚硝酸钠和阿魏酸，其线性分别在1.14至13.77 nM和3.23至41.98 nM范围内。相应的检出限为0.38 nM和1.39 nM。通过测定水和牛奶样品中的亚硝酸钠和阿魏酸，检查了rGO / ZrHCF修饰电极的真实样品分析，发现回收率在96.15至99.80之间。该传感器具有长期稳定性和可重复性。通过测定水和牛奶样品中的亚硝酸钠和阿魏酸，检查了rGO / ZrHCF修饰电极的真实样品分析，发现回收率在96.15至99.80之间。该传感器具有长期稳定性和可重复性。通过测定水和牛奶样品中的亚硝酸钠和阿魏酸，检查了rGO / ZrHCF修饰电极的真实样品分析，发现回收率在96.15至99.80之间。该传感器具有长期稳定性和可重复性。