A smartphone-based quantitative point-of-care testing (POCT) system for simultaneous detection of multiple heavy metal ions

It is of great significance to develop versatile and cost-effective point-of-care testing (POCT) systems for simultaneous quantitation of multiple analytes on-site. This work reports on: 1) the customized electrodes which exhibit good analytical performance for simultaneous detection of Cd2+, Cu2+, Hg2+, Pb2+ with low detection limits (Cd2+, 0.296 μM; Cu2+, 0.055 μM; Hg2+, 0.351 μM; and Pb2+, 0.025 μM) and wide dynamic ranges (Cd2+, 0.50–12.5...