Voltammetric Study for the Determination of Diclofenac in Aqueous Solutions Using Electro-Activated Carbon Electrodes

被引:8
|
作者
Berto, Silvia [1 ]
Cagno, Enrico [1 ]
Prenesti, Enrico [1 ]
Aragona, Giulia [1 ]
Bertinetti, Stefano [1 ]
Giacomino, Agnese [2 ]
Inaudi, Paolo [2 ]
Malandrino, Mery [1 ]
Terranova, Emanuele [1 ]
Abollino, Ornella [2 ]
机构
[1] Univ Turin, Dept Chem, Via P Giuria 7, I-10125 Turin, Italy
[2] Univ Turin, Dept Drug Sci & Technol, Via P Giuria 9, I-10125 Turin, Italy
来源
APPLIED SCIENCES-BASEL | 2022年 / 12卷 / 16期
关键词
diclofenac; glassy carbon electrode; screen printed electrodes; voltammetry; electrochemical activation; natural surface waters; ELECTROCHEMICAL DETERMINATION; GRAPHITE ELECTRODE; ACETAMINOPHEN; SODIUM; SENSOR;
D O I
10.3390/app12167983
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Featured Application The knowledge acquired in this work on the diclofenac electrochemical behavior will be essential to develop a voltammetric sensor for the drug detection in water samples. Diclofenac (DCF) is a nonsteroidal anti-inflammatory drug to treat pain and inflammatory diseases. The high consumption of the drug leads to a significant change in the ecosystem. With the aim of optimizing a fast screening analysis for DCF detection on many samples with a sensitive and cheap procedure, we considered electrochemical methods using carbon-based electrodes as sensors. The electrochemical behavior of the DCF was studied on glassy carbon electrodes (GCE) and on screen-printed carbon electrodes (SPCEs) from two different suppliers after an anodic activation. The surface of the SPCEs was analyzed by scanning electron microscope (SEM) and Energy Dispersive Spectrometry (EDS). On all the activated electrodes, the voltammetric procedure (Differential Pulse Voltammetry) for the determination of DCF was optimized by the Experimental Design method, and the linearity range of the response, as well as the calibration and limit parameters (limits of detection-LoD; limit of quantification-LoQ), were defined. Analyses on SPCEs were performed both by immersing the electrode in the solution and by deposing a drop of solution on the electrode. DCF signals are stabilized by the polishing process and enhanced by the anodic activation and acid pH. The electrochemical response of DCF is not reversible, and its by-products tend to be adsorbed on the surfaces, particularly on GCE. The lowest limit parameters were obtained using the GCE (LoD = 1.6 mu g L-1) and the SPCE, having the smallest surface, immersed in solution (LoD = 7 mu g L-1).
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页数:16
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