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Initial performance of sensor in blood matrix. (a) Comparison of cyclic voltammetry on bare SPCE and Nafion/MC/SPCE in 0.5 M HCl electrolyte and blood 6x diluted with 0.5 M HCl—addition of 20 ppm Pb shows an anodic peak around −0.51 V. (b) Optimization of the dilution factor of blood in 0.5 M HCl on Nafion/MC/SPCE sensor at concentration spikes of +3 μg dL−1 Pb (left, grey) and +10 μg dL−1 Pb (right, blue). Deposition potential of −1.1 V and deposition time of 600 s were used.
