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Linear sweep voltammograms for Pb (II), Cd (II), Cu (II) and In (III) (10 µg/mL) solutions recorded in paper-based electrodes modified with (A) mercury or (B) bismuth films. Preconcentration step: Ed = −1.2 V, td = 600 s). Stripping step: Ei = −1.2 V, Ef = 0 V, Es = 2 mV, v = 50 mV/s).
