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Plot-on-demand integrated paper-based sensors for drop-volume voltammetric monitoring of Pb(II) and Cd(II) using a bismuth nanoparticle-modified electrode

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Abstract

The fabrication of fully ink-drawn fluidic electrochemical paper-based analytical devices (ePADs) is reported for the determination of trace Pb(II) and Cd(II) by differential pulse anodic stripping voltammetry (DPASV). The fluidic pattern was formed on the paper substrate using an inexpensive computer-controlled x–y plotter and a commercial hydrophobic marker pen. Then, electrodes were deposited on the devices using a second x–y plotting step with a commercial technical pen filled with a graphite-based conductive ink prepared in house. The fabrication parameters of the ePADs were studied by cyclic voltammetry using the ferro/ferri couple as a probe and by scanning electron microscopy. The ePADs, featuring a bismuth nanoparticle-modified working electrode, were applied to the determination of Pb(II) and Cd(II) by DPASV. The chemical and instrumental conditions were studied. The limits of detection were 3.1 μg L−1 for Cd(II) and 4.5 μg L−1 for Pb(II) whereas the between-device reproducibility (expressed as the % relative standard deviation of the response at 6 different ePADs) was < 14%. Each ePAD requires 120 s to fabricate and costs less than 0.15 € in terms of consumables. The ePADs are suitable for the on-site determination of Pb(II) and Cd(II) in environmental and food samples.

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Authors and Affiliations

  1. Department of Chemistry, National and Kapodistrian University of Athens, 157 71, Athens, Greece

    Dionysios Soulis, Varvara Pagkali, Christos Kokkinos & Anastasios Economou

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  1. Dionysios Soulis
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  2. Varvara Pagkali
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  4. Anastasios Economou
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Soulis, D., Pagkali, V., Kokkinos, C. et al. Plot-on-demand integrated paper-based sensors for drop-volume voltammetric monitoring of Pb(II) and Cd(II) using a bismuth nanoparticle-modified electrode. Microchim Acta 189, 240 (2022). https://doi.org/10.1007/s00604-022-05335-0

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