▎ 摘　　要

A new electrochemical sensor that designed by using a glassy carbon electrode modified with graphene and Fe3O4 nanoparticles (Gr/Fe3O4/GCE) was used to detect nitrofuranzone and semicarbazide hydrochloride. The successful synthesis of composite materials Fe3O4 functionalized grapheme overcame the aggregation on the surface of GCE successfully and performed higher catalytic activity, reduced the interfacial resistance, and made the electron transfer easier. Under the optimal conditions, the obtained sensor presented linear response to nitrofuranzone in the range of 1.0x10(-5) to 1.09x10(-4) mol/L, the linear regression equation was i(pc) (10(-6)A)=-0.0219c (10(-6)mol/ L)-3.5303 with linear correlation coefficient was 0.9815. The detection limit was 2.92x10(-6). The linear range of semicarbazide hydrochloride was 1.0x10(-6) to 1.09x10(-4) mol/L and the linear regression equation was i(pa) (10(-6)A)= 0.0240c (10(-6)mol/ L)+0.7497 with linear correlation coefficient was 0.9992. The detection limit was 6.17x10(-7) mol/L. The recovery rate of nitrofuranzone and semicarbazide hydrochloride was 80.8%similar to 86% and 83.4%similar to 86.1%, respectively.