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Article Dans Une Revue Electroanalysis Année : 2021

Preconcentration and Successful Selective Detection of Traces of Diclofenac in Water using a Nanostructured Modified Carbon Paste Electrode

Résumé

A highly sensitive, simple and low cost sensor for the quantification of the diclofenac has been constructed. This sensor consists of a carbon paste nano-structured by Multi-Walled Carbon Nanotubes (G-MWCNT)-CPE. Scanning electron microscopy (SEM) and voltammetry technique were used to characterize the electrode material and to determine the analytical performances of the sensor in comparison with those obtained at a G-CPE. The electrochemical oxidation of diclofenac on both G-CPE and (G-MWCNT)-CPE electrodes is mainly controlled by adsorption, presenting a maximum peak current intensity in H2SO4 0.5 mol L-1. The carbon nanotubes, as well as they provide higher conductivity of the paste, act as spacers between the flake graphite particles and avoid their stacking in order to make the surface of graphite particles more accessible to DCF adsorption. The voltammetric measurements of diclofenac on (G-MWCNT)-CPE provide a large quantification range from 0.02 to 1 mu mol L-1, a detection limit of 0.004 mu mol L-1 and quantification limit of 0.014 mu mol L-1 under the optimized operating conditions (H2SO4, 0.25 M+KCl 0.25 M, scan rate of 30 mV s(-1), preconcentration time 18 min. and MWNTC% (30 %)). The (G-MWCNT)-CPE sensor was successfully applied to natural water samples, just acidified with sulfuric acid (pH<1). These samples were doped with diclofenac in sub-micromolar range and the developed method was validated with excellent recoveries (within a maximum of 3 % difference from 100 %) for all samples indicating no interference effects of the water matrix.

Domaines

Chimie
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Dates et versions

hal-03122486 , version 1 (05-02-2021)

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Siham Amra, Mustapha Bourouina, Saliha Bourouina Bacha, Didier Hauchard. Preconcentration and Successful Selective Detection of Traces of Diclofenac in Water using a Nanostructured Modified Carbon Paste Electrode. Electroanalysis, 2021, 33 (4), pp.936-946. ⟨10.1002/elan.202060415⟩. ⟨hal-03122486⟩
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