Antimony film electrode for chronopotentiometric determination of insecticide imidacloprid

Abstract

The most important experimental parameters were investigated for chronopotentiometric determination of imidacloprid using thin film antimony electrode as a working electrode. The film of antimony was ex-sifu plated on the glassy carbon electrode. Britton-Robinson buffer pH 10 was used as an optimal supporting electrolyte, where imidacloprid provided a well define and reproductive reduction signal at the potential of -1100 mV (vs. Ag/AgCl, 3.5 mol/dm’* KCI). Based on the height and reproducibility of the analytical signal, initial potential of -0.51 V was accepted as optimal, while selected optimal ranges of reduction current were from -5 pA to -14.4 pA, and from -4.6 pA to -18.2 pA, for concentrations of 2 mg/dm” and 10 mg/dm°*, respectively. It was determined that analytical signal of imidacloprid decreased exponentially with more negative values of reduction current. Before application of this method to environmental samples. additional experiments related to method validation are necessary.