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Expanding the possibilities of electrografting modification of voltammetric sensors through two complementary strategies
- Source :
- Dipòsit Digital de la UB, Universidad de Barcelona, Recercat. Dipósit de la Recerca de Catalunya, instname
- Publication Year :
- 2019
- Publisher :
- Elsevier Ltd, 2019.
-
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.
- Subjects :
- Chemistry
Anàlisi electroquímica
General Chemical Engineering
Metal ions in aqueous solution
Aryl
Inorganic chemistry
Electrochemical analysis
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Anodic stripping voltammetry
chemistry.chemical_compound
Electrode
Electrochemistry
0210 nano-technology
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Dipòsit Digital de la UB, Universidad de Barcelona, Recercat. Dipósit de la Recerca de Catalunya, instname
- Accession number :
- edsair.doi.dedup.....509fbcedcfb7fccb8132fdb90db8b365