Development of a “Green” Paper-Based Voltammetric Platform for On-Site Assay of Tl(I)

In this work, a “green” electrochemical paper-based device (ePAD) for the voltammetric determination of Tl(I) is described. A mini voltammetric cell was patterned on chromatographic paper using screen-printing to deposit three carbon electrodes and plotting with a hydrophobic ink to from a circular assay zone. The sample was added to the assay zone (which was pre-loaded with Bi(III)) and Tl(I) is quantified by anodic stripping voltammetry (ASV). The experimental conditions and the potential interferences were studied. The limit of detection was at the low μg L^-1 level, indicating that these devices can serve successfully as fit-for-purpose disposable voltammetric sensors for Tl(I).