Abstract
Novel miniaturized Pb(II) paper-based potentiometric sensors are described using coumarin derivatives I and II as electroactive ionophores and nano vanadium pentoxide as a solid contact material for the sensitive and selective monitoring of trace lead ions. Density functional theory (DFT) confirms optimum geometries, electronic properties, and charge transfer behaviors of 1:2 Pb(II): coumarin complexes. The sensors are prepared by using two strips of 20 × 5 mm filter paper with two circular orifices. One orifice is coated with vanadium pentoxide (V2O5) nanoparticles in colloidal conductive carbon as a solid-contact, covered by a PVC membrane containing coumarin ionophore to act as a sensing probe. The other orifice is treated with Ag/AgCl in a polyvinyl butyral (PVB) film, to act as a reference electrode. Sensors with ionophores (I) and (II) exhibit Nernstian slopes of 27.7 ± 0.2 and 30.2 ± 0.2 mV/decade over the linear concentration range 4.5 × 10−7 to 6.2 × 10−3 M and 8.5 × 10−8 to 6.2 × 10−3 M, with detection limits of 1.3 × 10−7 M (26.9 ppb) and 2.1 × 10−8 M (4.4 ppb), respectively. The sensors are satisfactorily used for accurate determination of lead ions in drinking water, lead-acid battery wastewater, and electronic waste leachates. The results compare favourably well with data obtained by flameless atomic absorption spectrometry.
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Data availability
Data will be made available on request.
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Saad S.M. Hassan: supervision, conceptualization, validation, writing reviewing and editing. Mahmoud Abdelwahab Fathy: resources, methodology, investigation, formal analysis, data curation, visualization, validation, writing—original draft, writing—reviewing and editing.
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Hassan, S.S.M., Fathy, M.A. Novel paper-based potentiometric combined sensors using coumarin derivatives modified with vanadium pentoxide nanoparticles for the selective determination of trace levels of lead ions. Microchim Acta 191, 427 (2024). https://doi.org/10.1007/s00604-024-06494-y
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DOI: https://doi.org/10.1007/s00604-024-06494-y