▎ 摘　　要

In this work, a simple, sensitive and rapid electrochemical sensor for bisphenol A determination based on a 3D Au NPs-poly-L-glutamate/graphene nanocomposite was proposed and the structures of the nanocomposite were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopic (FTIR) and X-ray diffraction (XRD). The electrochemical behaviors of bisphenol A on the nanocomposite GCE were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). In the potential range of 0.0 similar to 1.0 V, an irreversible oxidation peak appeared on the modified electrode in 0.1 mol L-1 phosphate buffer solution (pH = 6.0). Under the optimum conditions, the anode peak current of bisphenol A increased linearly with the its concentration in the ranges from 0.009 mu mol L-1 to 0.1 mu mol L-1 and 0.1 mu mol L-1 to 1.0 mu mol L(-1)with the detection limit down to 3x10(-10) mol L-1 (S/N = 3) and the corresponding linear regression equations were Ipa(mu A)= -0.1129 C (mu mol L-1) + 0.5532 (N = 6, R-2 = 0.9057) and Ipa(mu A) = -0.05970 C (mu mol L-1) + 0.02182 (N = 5, R-2 = 0.9950) respectively. The proposed method was successfully used for the determination of bisphenol A content in wastewater and milk samples, and the recoveries were in the range from 98.10% to 104.9%.