Non-enzymatic electrochemical sensor based on ionic liquid [BMIM][PF6] functionalized zirconium-copper bimetallic MOF composite for the detection of nitrite in food samples

In this study, we developed an electrochemical sensor utilizing a composite material consisting of zirconium -copper bimetallic metal -organic framework functionalized with ionic liquid [BMIM][PF 6 ]. This composite material was fabricated by simple wet impregnation method, which not only maintains excellent electrocatalytic activity but also enhances electron transfer rate and electroactive surface area. The ZrCu-MOF-818/ILs composite modified electrode has been demonstrated as an effective tool for the detection of nitrite. The electrode exhibited a remarkable limit of detection (LOD) of 0.148 mu M and wide linear ranges of 6 -3000 mu M and 3000 -5030 mu M. It is worth noting that the sensor displayed excellent reproducibility and repeatability, with relative standard deviation (RSD) values of 1.06% and 1.37%, respectively. Furthermore, the proposed method was successfully applied for the detection of nitrite in tap water and pickle juice.