Abstract
In this paper a hydrophilic ionic liquid of 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF 4) was used as modifier to make a new kind of ionic liquid-modified carbon paste electrode (IL-CPE), which was further characterized by different methods including electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and scanning electron microscope (SEM). The fabricated IL-CPE showed good electrocatalytic behaviors towards the oxidation of metol with the enhancement of the redox peak current and the decrease of the peak-to-peak separation. The electrochemical behaviors of metol on the IL-CPE were carefully studied and the electrochemical parameters were calculated. Based on the electrocatalytic reaction, a new electrochemical method for the metol determination was established in the concentration range from 4.0 × 10 −6 to 5.0 × 10 −3 mol L −1 by cyclic voltammetry with the detection limit estimated to be 2.0 × 10 −6 mol L −1 (3 σ). The established method was successfully applied to the synthetic samples and photographic solutions detection with good recovery.
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