Research Article
Simultaneous Determination of Zn(II), Cd(II), Pb(II), and Cu(II) Using Differential Pulse Anodic Stripping Voltammetry at a Bismuth Film-Modified Electrode
Figure 5
(a) DP-ASVs of Zn(II), Cd(II), Pb(II), and Cu(II) oxidation with different concentrations in acetate buffer (pH 5) at BiFE. (a) Zn(II), Cd(II), and Pb(II) fixed at 15 ppb; Cu(II) (from 5.0 to 110.0 ppb): 5.0, 10.0, 15.0, 20.0, 30.0, 40.0, 50.0, 70.0, 90.0, and 110.0 ppb; inset: the calibration curves of Cu(II); (b) Zn(II), Cd(II), and Cu(II) fixed at 15 ppb; inset: the calibration curves of Pb(II) (from 5.0 to 110.0 ppb); (c) Zn(II), Pb(II), and Cu(II) fixed at 15 ppb; inset: the calibration curve of Cd(II) (from 5.0 to 110.0 ppb); (d) Cd(II), Pb(II), and Cu(II) fixed at 15 ppb; inset: the calibration curve of Zn(II) (from 5.0 to 110.0 ppb). Acetate buffer: pH 5; Bi(III): 500 ppb; accumulation potential –1.6 V; accumulation time 110 s; accumulation potential –1.6 V; accumulation time 110 s; pulsed amplitude 0.07 V; scan rate 0.021 V·s−1.
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