Alberti, G.; Magnaghi, L.R.; Iurato, M.; Zanoni, C.; Biesuz, R. Colorimetric Paper-Based Analytical Devices (PADs) Backed by Chemometrics for Pd(II) Detection. Sensors2023, 23, 7425.
Alberti, G.; Magnaghi, L.R.; Iurato, M.; Zanoni, C.; Biesuz, R. Colorimetric Paper-Based Analytical Devices (PADs) Backed by Chemometrics for Pd(II) Detection. Sensors 2023, 23, 7425.
Alberti, G.; Magnaghi, L.R.; Iurato, M.; Zanoni, C.; Biesuz, R. Colorimetric Paper-Based Analytical Devices (PADs) Backed by Chemometrics for Pd(II) Detection. Sensors2023, 23, 7425.
Alberti, G.; Magnaghi, L.R.; Iurato, M.; Zanoni, C.; Biesuz, R. Colorimetric Paper-Based Analytical Devices (PADs) Backed by Chemometrics for Pd(II) Detection. Sensors 2023, 23, 7425.
Abstract
The paper presents the development of cheap and selective Paper-based Analytical Devices (PADs) for Pd(II) determination. The PADs were obtained with an azoic ligand, (2-(tetrazolylazo)-1,8 dihydroxy naphthalene-3,6,-disulphonic acid), termed TazoC, and filter paper as the substrate. The orange TazoC-PADs interact quickly with Pd(II) solutions by forming a complex purple-blue-colored already at a very acidic pH (lower than 2). The dye complexes no other metal ions at such an acidic media, making TazoC-PADs highly selective to Pd(II) detection. Besides, at higher pH values, other cations, for example, Cu(II) and Ni(II), can interact with TazoC through the formation of stable and pink-magenta-colored complexes; however, it is possible to quantify Pd(II) also in the presence of other cations using a multivariate approach. Indeed, by applying Partial Least Square regression (PLS), the spectra of the TazoC-PADs were related to the Pd(II) concentrations both when present alone in solution and also in the presence of Cu(II) and Ni(II). The PLS models correctly predicted Pd(II) concentrations in unknown samples and tap water spiked with the metal cation.
Chemistry and Materials Science, Analytical Chemistry
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