▎ 摘　　要

Au nanoparticles (AuNPs)/graphene nanocomposites has been fabricated and employed for the detection of nitrite. Morphological characterizations of nanocomposites showed that the Au nanoparticles were well dispersed on the graphene nanosheets surface with particle sizes of around 12 nm. Electrochemical investigations indicated that AuNPs/graphene nanocomposites electrode had high catalytic activity than the AuNPs on GCE and original GCE for the nitrite oxidation. Under the optimum conditions, the linear concentration dependences of peak current responses are observed for nitrite in the concentration ranges of 5.0x10(-5)similar to 5.1x10(-3) mol/L with the correlation coefficients of 0.998. The modified electrode has been used for determinations of nitrite in a real sample with satisfactory results.