Abstract
In the present work, an efficient, fast and sensitive method for the determination of hydroxylamine (HyA) has been developed based on carbon paste electrode (CPE) modified with La2O3/Co3O4 nanocomposite and ionic liquid (LaCo/IL/CPE). The developed method was assessed using cyclic voltammetry, chronoamperometry and differential pulse voltammetry (DPV) methods. The LaCo/IL/CPE sensor showed good response ability and good electrocatalytic activity for HyA. The results showed that, electrochemical oxidation signal of HyA at the surface of LaCo/IL/CPE was 4.8 times the signal at the surface of LaCo/CPE. Also, potential of peak (Ep) of HyA at the surface of LaCo/IL/CPE was 700 mV while at the bare CPE, HyA was not oxidized until the potential reached +1200 mV. The obtained results showed that the oxidation process of HyA at the LaCo/IL/CPE was controlled by diffusion and the average diffusion coefficient for HyA, 2.8 × 10−6 cm2/s was obtained. The experimental conditions such as pH of solution, scan rate and instrumental parameters for DPV were assessed and optimized for electrochemical determination of HyA. Under optimum conditions, a linear response for HyA in the concentration range 0.06–240.0 μM was found, with a detection limit of 3.0 nM. In the final, HyA in different water samples was detected by the standard addition procedure.
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