Abstract: Using selfassembly polystyrene microspheres monolayer template and pulse electrodeposition method, we assembled a twodimensional silica/gold spherical cavity microelectrode array, and used square wave pulse voltammetry method to test its performance. The results show that when the mass concentration of Pb(Ⅱ) is 0—100 μg/L, the response of the electrode and the ion mass concentration  is linear, the sensitivity of detection is 0.070 35 μA·L/μg (S/N=3), and a limit of detection (LOD) is 0.3 μg/L. The ability of the array to resist interference of Cu(Ⅱ) is stronger.

Key words: detection of trace lead, microelectrode array, electrochemical detection, electrochemical deposition