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First Electrochemical Sensor (Screen-Printed Carbon Electrode Modified with Carboxyl Functionalized Multiwalled Carbon Nanotubes) for Ultratrace Determination of Diclofenac

1
Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
2
Department of Analytical Chemistry, Medical University of Lublin, 20-093 Lublin, Poland
*
Authors to whom correspondence should be addressed.
Materials 2020, 13(3), 781; https://doi.org/10.3390/ma13030781
Received: 14 January 2020 / Revised: 31 January 2020 / Accepted: 5 February 2020 / Published: 8 February 2020
(This article belongs to the Section Carbon Materials)
A simple, sensitive and time-saving differential-pulse adsorptive stripping voltammetric (DPAdSV) procedure using a screen-printed carbon electrode modified with carboxyl functionalized multiwalled carbon nanotubes (SPCE/MWCNTs-COOH) for the determination of diclofenac (DF) is presented. The sensor was characterized using optical profilometry, SEM, and cyclic voltammetry (CV). The use of carboxyl functionalized MWCNTs as a SPCE modifier improved the electron transfer process and the active surface area of sensor. Under optimum conditions, very sensitive results were obtained with a linear range of 0.1–10.0 nmol L−1 and a limit of detection value of 0.028 nmol L−1. The SPCE/MWCNTs-COOH also exhibited satisfactory repeatability, reproducibility, and selectivity towards potential interferences. Moreover, for the first time, the electrochemical sensor allows determining the real concentrations of DF in environmental water samples without sample pretreatment steps. View Full-Text
Keywords: screen-printed carbon electrode modified with carboxyl functionalized multiwalled carbon nanotubes; diclofenac; differential-pulse adsorptive stripping voltammetry; environmental water samples; HPLC with photo-diode array detection screen-printed carbon electrode modified with carboxyl functionalized multiwalled carbon nanotubes; diclofenac; differential-pulse adsorptive stripping voltammetry; environmental water samples; HPLC with photo-diode array detection
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MDPI and ACS Style

Sasal, A.; Tyszczuk-Rotko, K.; Wójciak, M.; Sowa, I. First Electrochemical Sensor (Screen-Printed Carbon Electrode Modified with Carboxyl Functionalized Multiwalled Carbon Nanotubes) for Ultratrace Determination of Diclofenac. Materials 2020, 13, 781.

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