▎ 摘　　要

A disposable screen graphene-printed electrode (SGPE) was developed by directly printing the prepared graphene paste on the surface of screen-printed carbon working electrode, and a differential pulse stripping voltammetry (DPV) method combing with portable potensiostat were introduced to the rapid detection of trace Cd2+ in rice samples. The surface morphology of SGPE was characterized by scanning electron microscope, and the graphene structure and its electrochemical activity were confirmed by Raman spectroscopy and cyclic voltammetry. Results showed that SGPE presents better conductivity than screen-printed carbon electrode or glass carbon electrode. The pre-concentration potential and time were optimized as -1.5 V and 500 s. And a pH 8.2 basic buffer was selected because OH-did not pose an interference (K-sp of Cd(OH)(2) = 2.5x10(-14)) and show a good stripping current signal. The obtained results from portable potentiostat were similar to the results obtained by inductively coupled plasma mass spectrometry (ICP-MS). Therefore, the proposed SGPE and its effectively analytical method could be further improved for the realization of an ideally rapid on-site detector for trace Cd2+ detection in rice samples.