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Electrochemical behavior of labetalol (LBT) at carbon paste electrode (CPE)  and an ionic  liquid1-benzyl-3-methylimidazolehexafluorophosphate([BnMIM]PF6)modified  carbon paste electrode([BnMIM]PF6/CPE)in Britton-Robinson buffer solution (pH  2.0) was investigated by cyclic voltammetry (CV) and square wave voltammetric  (SWV). The experimental results showed that LBT at both the bare CPE and  [BnMIM]PF6/CPEshowed an irreversible oxidation process, but at [BnMIM]PF6/CPE  its oxidation peak current increased greatly and the oxidation peak potential  shifted negatively. The electrode reaction process is a diffusion-controlled  process involving one electron transferring accompanied by a participation of  one proton at [BnMIM]PF6/CPE. At the same time, the electrochemical kinetic  parameters were determined. Under the optimized electrochemical experimental  conditions, the oxidation peak currents were proportional to LBT  concentration in the range of 7.0 x 10-6-1.0 x 10-4 mol L-1 with the limit of  detection(LOD, S/N=3) of 4.810 x 10-8 mol L-1and the limit of  quantification(LOQ, S/N=10) of 1.60 x 10-7 mol L-1, respectively. The  proposed method was successfully applied in the determination of LBT content  in commercial tablet samples

Electrochemical behavior of labetalol at an ionic liquid modified carbon paste electrode and its electrochemical determination