Abstract
The direct electrochemistry of diclofenac (DCF) at a surface of modified carbon paste electrode (CPE) was described. The electrode was modified with multiwall carbon nanotubes (MWCNTs) and 1-butyl-3-methylimidazolium hexafluoro phosphate as a binder. The oxidation peak potential of the DCF at a surface of the ionic liquid carbon nanotubes paste electrode (IL/CNTPE) appeared at 750mV that was about 70mV lower than the oxidation peak potential at the surface of the traditional carbon paste electrode under similar condition. Under the optimized conditions at pH7.0, the peak current was linear to DCF concentrations over the concentration range of 0.3–750μmolL−1, using square wave voltammetry (SWV). The detection limit was 0.09μmolL−1. The proposed method was successfully applied to the determination of DCF in both pharmaceutical and patient urine samples.
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