Abstract:This article employed a hydrothermal method to prepare rod-shaped bismuth sulfide（Bi2S3）particles and used an ultrasonic compounding method to create Bi2S3-graphene（Bi2S3-Gr）composite material by combining Bi2S3 with Gr.The composite material was drop-coated onto a glassy carbon electrode（GCE）to construct an electrochemical sensor for the sensitive detection of 6-benzylaminopurine（6-BA）.Under optimal conditions，the electrochemical analysis of 6-BA indicated that its oxidation on the Bi2S3-Gr/GCE was diffusioncontrolled and involved a two-electron process.Differential pulse voltammetry（DPV）was used to detect 6-BA in the concentration range of 0.5 to 100 μmol/L，with a limit of detection（LOD）of 2.7×10-7 mol/L.The prepared Bi2S3-Gr/GCE sensor demonstrated good repeatability and reproducibility，with relative standard deviations（RSDs）of 3.52%and 4.31%，respectively.Common interferents did not affect the detection of 6-BA.The sensor′s applicability for quantitative analysis of 6-BA was demonstrated by determining the 6-BA content in bean sprouts using a standard addition method，resulting in recovery rates ranging from 92.75% to 112.10%.This indicated that the sensor held promise for practical applications in the quantitative analysis of 6-BA.