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In Britton-Robinson buffer,metronidazole is preconcentreted on HHDE at 0.0 V(Vs.Ag-AgCI),An adsorptive stripping peak is observed at-0.62 V.Tho response is linear from 1x10<sup>-8</sup>to1×10<sup>-6</sup>mol/L with 1.5 min acc