A simple and sensitive electrochemical method was developed for the determination of 3,3′5,5′-tetrabromobisphenol A(TBBPA) based on Ag-loading white carbon black composites modified carbon paste electrode(Ag-SiO2/CPE).Ag-SiO2 composite was synthesized and its morphology and structure were characterized by scanning electron microscopy(SEM),fourier infrared spectrometry(FT-IR) and X ray photoelectron spectroscopy(XPS).The electrochemical property of Ag-SiO2/CPE was characterized by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS).Futhermore,CV and linear sweep voltammetry(LSV) were proposed to study the electrochemical oxidation behavior of TBBPA at the modified electrode.The CV results showed that,compared with bare electrode,the modified electrode displayed an enhanced electrocatalytic activity toward the oxidation of TBBPA with a well defined cyclic voltammetric peak.Conditions influencing the detection process such as content of modifier,pH value of buffer solution and scan rate were optimized.Also,the repeatability,stability and selectivity were further studied.Under the optimized conditions,the oxidation current increased linearly with the increase of TBBPA concentration in the ranges of 0.010-0.10 μmol/L and 0.10-25 μmol/L,and the detection limit(S/N=3) was found to be 1.9 nmol/L.The proposed method was applied in the direct determination of TBBPA in electronic products with satisfactory results,and the recoveries were in the range of 96%-103%.The results agreed quite well with those obtained by capillary electrophoresis(CE).