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Title: Expanding the possibilities of electrografting modification of voltammetric sensors through two complementary strategies
Author: Pérez Ràfols, Clara
Rosal Soria, Miguel
Serrano i Plana, Núria
Ariño Blasco, Cristina
Esteban i Cortada, Miquel
Díaz Cruz, José Manuel
Keywords: Anàlisi electroquímica
Electrochemical analysis
Issue Date: 11-Sep-2019
Publisher: Elsevier Ltd
Abstract: Two different modification strategies by means of aryl diazonium salt electrografting were compared for the development of voltammetric sensors. In this sense, l-cysteine was immobilized onto a screen-printed carbon-based electrode surface through either its -NH2 or its -COOH group and the performance of the resulting modified sensors was tested for the simultaneous determination of Pb(II) and Cd(II) by anodic stripping voltammetry. The results obtained indicate that attachment through the -COOH group of cysteine, despite being a much less frequent electrografting strategy, improves the analytical performance of the resulting sensor achieving lower LODs, at low μg L−1 levels, for Cd(II) and Pb(II). Furthermore, this strategy allows the quantification of both metal ions below the legal limits established by the European Water Framework Directive, which represents a great improvement with respect to similar sensors reported in the literature
Note: Versió postprint del document publicat a:
It is part of: Electrochimica Acta, 2019, vol. 319, p. 878-884
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ISSN: 0013-4686
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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