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Screen Graphene-printed Electrode for Trace Cadmium Detection in Rice Samples Combing with Portable Potentiostat

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Figure

Figure 1. SEM images of SPCE(A) and SGPE(B), Raman spectrum of SGPE(C) and cyclic voltammograms of glass carbon electrode vs Hg/HgCl2 (a), SPCE(b) and SGPE(c) vs Ag/AgCl in 2 mmol/L KFe(CN) (D)
Figure 2. Cyclic voltammogram of SGPE in 2 mmol/L K3[Fe(CN)6] (0.1 mol/L KCl) from 0 to -1.8 V, insert: the relationship of pre-concentration potential and electrical current(A), the relationship of electrodeposition time(100, 200, 300, 400, 450, 500 and 550 s) and the electrical current(B), the relationship of pH and electrical current, phosphorus buffer solution (0.2 mol/L, pH 5.8, 6.2, 6.6, 7.0, 7.4, 7.6, 8.0) ; CH3COOH–CH3COONa buffer solution (0.2 mol/L, pH 3.8, 4.2, 4.6, 5.0, 5.4); Tris–HCl buffer solution (0.05 mol/L; pH 8.0, 8.2, 8.4, 8.6, 8.8)(C)
Table 1. The recovery and precision (n=6)
Figure 4. The DPV curves of different concentrations of Cd2+ at CHI, insert: standard addition curves of three rice samples (n=5)
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