Electrochemical Method for Ease Determination of Sodium Diclofenac Trace Levels in Water Using Graphene—Multi-Walled Carbon Nanotubes Paste Electrode

Sorina Motoc, Florica Manea, Anamaria Baciu, Corina Orha and Aniela Pop
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Sorina Motoc: “Coriolan Drăgulescu” Institute of Chemistry, Romanian Academy, 24 Mihai Viteazu Bvd., 300223 Timisoara, Romania
Florica Manea: Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, 6 Bv. V. Parvan, 300223 Timisoara, Romania
Anamaria Baciu: Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, 6 Bv. V. Parvan, 300223 Timisoara, Romania
Corina Orha: National Condensed Matter Department, Institute for Research and Development in Electrochemistry and Condensed Matter Timisoara, 1 P. Andronescu Street, 300254 Timisoara, Romania
Aniela Pop: Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, 6 Bv. V. Parvan, 300223 Timisoara, Romania

IJERPH, 2021, vol. 19, issue 1, 1-16

Abstract: Sodium diclofenac (DCF) presence reported in water use cycle at various concentrations including trace levels necessitates continuous development of advanced analytical method for its determination. In this work, ease electrochemical methods for DCF determination based on voltammetric and amperometric techniques were proposed using a simple combination of graphene with multi-walled carbon nanotubes as paste electrode. Integration of the graphene with multi-walled carbon nanotubes enlarged the electroactive surface area of the electrode and implicitly enhanced the electrochemical response for DCF determination. On the basis of the sorption autocatalytic effect manifested at low concentration of DCF, we found that the preconcentration step applied prior to differential-pulsed voltammetry (DPV) and multiple-pulsed amperometry (MPA) allowed for the enhancement of the electroanalytical performance of the DCF electrochemical detections, which were validated by testing in tap water. The lowest limit of detection (LOD) of 1.40 ng·L −1 was found using preconcentration prior to DPV under optimized operating conditions, which is better than that reached by other carbon-based electrodes reported in the literature.

Keywords: water quality; water monitoring; sodium diclofenac; graphene; multi-walled carbon nanotubes; paste electrode; electrochemical detection; sorption; preconcentration (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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