Abstract：Graphenenafion composite was coated on glassy carbon electrode surface, and then paminobenzoic acid was modified on it to fabricate poly(paminobenzoic acid)/graphenenafion modified glassy carbon electrodes by using electrochemical polymerization method. The electrochemical behavior of Cu2+ at the modified electrode was investigated by differential pulse stripping voltammetry. It was found that Cu2+ can be effectively concentrated and the rate of electron transfer can be improved on the modified electrode based on the synergetic effect of the Grnafion and poly(pABA) film. The experimental parameters were optimized. The results showed that the sensor had good reproducibility. Some anions and cations had no interference to the determination of Cu2+ with the developed method. The peak currents were linearly dependent on the concentrations of Cu2+in the range from 50×10-7 mol/L to 40×105 mol/L with a coefficiency of 0995 The detection limit was 50×10-9 mol/L (S/N = 3). The proposed method was applied to the determination of Cu2+ in waste water samples and the results were found to be in accordance with that detected by ICPAES. The relative standard deviation was 24%36%. The sensor could be used for the simultaneous determination of Cu2+ and Cd2+ because a big peaktopeak separation was obtained in the cyclic voltammograms.
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