Modification of electrodes with polymer nanocomposites: Application to the simultaneous determination of Zn(II), Cd(II), and Cu(II) in water samples.

Autor: Biasi ALM; Instituto Multidisciplinario de Investigaciones Biológicas (IMIBIO), Departamento de Bioquímica, Universidad Nacional de San Luis, CONICET, Avenida Ejército de los Andes 950, D 5700 BWS, San Luis, Argentina., Takara EA; Instituto de Física Aplicada (INFAP), Departamento de Química, Universidad Nacional de San Luis. CONICET, Avenida Ejército de los Andes 950, D 5700 BWS, San Luis, Argentina. Electronic address: eatakara@gmail.com., Scala-Benuzzi ML; Instituto de Química de San Luis (INQUISAL), Departamento de Química, Universidad Nacional de San Luis, CONICET, Chacabuco 917, D5700BWS, San Luis, Argentina., Valverde AM; Instituto de Química de San Luis (INQUISAL), Departamento de Química, Universidad Nacional de San Luis, CONICET, Chacabuco 917, D5700BWS, San Luis, Argentina., Gómez NN; Instituto Multidisciplinario de Investigaciones Biológicas (IMIBIO), Departamento de Bioquímica, Universidad Nacional de San Luis, CONICET, Avenida Ejército de los Andes 950, D 5700 BWS, San Luis, Argentina., Messina GA; Instituto de Química de San Luis (INQUISAL), Departamento de Química, Universidad Nacional de San Luis, CONICET, Chacabuco 917, D5700BWS, San Luis, Argentina.
Jazyk: angličtina
Zdroj: Analytica chimica acta [Anal Chim Acta] 2023 Sep 08; Vol. 1273, pp. 341499. Date of Electronic Publication: 2023 Jun 15.
DOI: 10.1016/j.aca.2023.341499
Abstrakt: Currently, there is a need for fast and sensitive analytical methods for monitoring metals in water due to the progressive increase in the presence of metal ions in the environment. These metals reach the environment mainly from industrial activity and heavy metals are non-biodegradable. The present work evaluates different polymeric nanocomposites to carry out the simultaneous electrochemical determination of Cu, Cd, and Zn in water samples. Screen-printed carbon electrodes (SPCE) were modified with the nanocomposites, which were obtained by a mixture of graphene, graphite oxide, and polymers, such as polyethyleneimide, gelatin, and chitosan. These polymers have amino groups in their matrix, giving the nanocomposite the ability to retain divalent cations. However, the availability of these groups plays a fundamental role in the retention of these metals. The modified SPCEs were characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, electrochemical impedance spectroscopy, and cyclic voltammetry. The electrode that presented the best performance was selected to determine the concentration of metal ions in water samples by square-wave anodic stripping voltammetry. The obtained detection limits were 0.23 μg L -1 , 0.53 μg L -1 , and 1.52 μg L -1 for Zn(II), Cd(II), and Cu(II), respectively, with a lineal range of 0.1-50 μg L -1 . The obtained results made it possible to conclude that the method developed using the SPCE modified with the polymeric nanocomposite presented adequate LODs, reasonable sensitivity, selectivity, and reproducibility. Besides, this platform is an excellent tool for developing devices to simultaneously determine heavy metals in environmental samples.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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