▎ 摘　　要

In this paper, we developed an electrochemical sensor for the detection of oxalic acid (OA). The electrochemical sensor was prepared by hydrothermal synthesis of three dimensional (3D) graphene aerogel (GA). The obtained sensor was characterized by a series of techniques. It was found that the GA modified GCE displays excellent catalytic property toward the oxidation of OA, which make it became an enzymeless sensor with high selectivity, good reproducibility and stability. The sensor shows a linear relation towards OA detection in the concentration of 4 to 100 mu M with a low detection limit of 0.8 mu M. Moreover, the proposed sensor was used for OA detection in tomato and onion samples.