▎ 摘　　要

The oxidation of ammonia to nitrate produces nitrite as an intermediate product. Nitrite is used in food to protect against microbial contamination, for salty taste, and, act as additives to improve the food quality. However, it is discharged into the environment is harmful to the ecosystem and human health, therefore quick, portable, and economical sensors are essential for the detection of nitrite in vegetables, fruits, processed meats, and pharmaceutical samples. In this work, we successfully developed the cobalt ruthenium sulfide (CRS) nanoparticles embedded on (BN-RGO) boron, nitrogen codoped reduced graphene oxide nanocomposite by a facile hydrothermal assisted ultrasonication method, and the CRS/BN-RGO based sensor was used for the detection of nitrite, which is more selective, sensitive, and economical. The newly synthesized CRS/BN-RGO sensor material was characterized by various morphological and structural investigation studies. The BN-RGO nanosheets improved the electrical conductivity of the CRS nanoparticles, which was confirmed by EIS and CV studies. According to the electrochemical investigations, our proposed CRS/BN-RGO sensor exhibited good selectivity and sensitivity towards nitrite. Moreover, the nitrite was detected under the optimized experimental conditions, and the CRS/BN-RGO sensor exhibited the low detection limit (LOD) of 0.0159 mu M, good sensitivity of 1.5309 mu A mu M-1 cm 2, and a wide linear range of 0.001-1290 mu M. Furthermore, we examined the proposed CRS/BN-RGO sensor's practical performance towards nitrite in the real water samples, which exhibited good recovery results.