Abstract: Solid sensor modified by urushiol Fe resin was prepared for the determination of trace copper in water.Mechanism of increasing sensitivity has been studied.In 0.1 mol/L KNO₃ and HOAc NaOAc solution, peak current is linearly correlated with concentration over the range from 4×10^-9 mol/L to 2.5×10^-7 mol/L.Detection limit(signal to noise=3) is 8×10^-11 mol/L after 20 min accumulation.Using the electrode, Cu²⁺ in water samples were detected, and average recovery is 99.10%.

Key words: urushiol-Fe resin, solid sensor, chemical modification