Langmuir-Blodgett film of tetraoxocalix[2]arene[2]triazine modified electrode for voltammetric determination of copper ion.

In the present work, a new voltammetric sensor, Langmuir-Blodgett (LB) film of tetraoxocalix[2]arene[2]triazine (TOCT) modified glassy carbon electrode (LB-GCE), for trace analysis of copper ion in water samples, was prepared. The morphology of LB-GCE was characterized by cyclic voltammetric method, electrochemical impedance spectroscopy, and atomic force microscope. The recognizing mechanism of LB-GCE for copper ion in aqueous solution was discussed. Under the optimum experimental conditions, using square wave stripping voltammetry and accumulation time of 300 s, the peak currents were linear relationship with Cu concentrations in the range of 2 × 10 to 1 × 10 mol L, with detection limit of 1 × 10 mol L. By this method, real samples (lake water, drinking water, and city wastewater) were analyzed with satisfactory results. In addition, the fabricated electrode exhibited a distinct advantage of simple preparation, non-toxicity, good reproducibility, and stability. [ABSTRACT FROM AUTHOR]