Abstract：The glutamic acid-nanogold-graphene was made into a novel electrochemical electrode for the sensitive determination of lead ions in water samples. Glutamic acid-nanogold-graphene modified carbon ionic liquid electrode was prepared through depositing graphene and nanogold on carbon paste electrode surface with N-butyl pyridine hexafluorophosphate as binder and modifier by electrochemical method and connecting glutamic acid with glutaraldehyde with the help of covalent bonding. It was showed that the graphene and nanogold on the surface of the electrode greatly enhanced the electrochemical capacity of the electrode. As glutamic acid and grapheme possessed of good selectivity and electroconductibility respectively, the signal response and selectivity of sensor to Pb2+ all were improved. Under the optimal conditions, the current of lead was proportional to its concentration in the range of 1.0×10-9-4.0×10-6 mol/L with the detection limit of 3.0×10-10 mol/L(3σ). The proposed method was applied to the analysis of lead in industrial and domestic wastewater, well water and rainwater. The results were consistent with those of atomic absorption spectrometry, with relative standard deviation of 3.0 %-3.8 %.
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