Research Article
Voltammetry Determination of Pb(II), Cd(II), and Zn(II) at Bismuth Film Electrode Combined with 8-Hydroxyquinoline as a Complexing Agent
Table 3
Analysis of variance (ANOVA) for B-B design.
| Terms | Coefficient Ipc,Pb | | Coefficient Ipc,Cd | | Coefficient Ipc,Zn | |
| Constant | 1.95 | ≤0.001 | 2.00 | ≤0.001 | 2.00 | ≤0.001 | x1 | 0.08 | 0.003 | 0.08 | 0.061 | 0.08 | 0.042 | x2 | 0.19 | ≤0.001 | 0.22 | 0.001 | 0.21 | 0.001 | x3 | 0.12 | 0.001 | 0.16 | 0.006 | 0.15 | 0.005 | | –0.35 | ≤0.001 | –0.37 | 0.001 | –0.36 | ≤0.001 | | –0.44 | ≤0.001 | –0.44 | ≤0.001 | –0.45 | ≤0.001 | | –0.19 | ≤0.001 | –0.18 | 0.014 | –0.19 | 0.008 | x1 · x2 | 0.00 | 0.909 | 0.00 | 0.960 | 0.00 | 0.912 | x1 · x3 | 0.00 | 1.000 | 0.00 | 1.000 | 0.00 | 1.000 | x2 · x3 | 0.11 | 0.004 | 0.13 | 0.047 | 0.11 | 0.050 | Regression | | | | | | Lack of fit | | | | | |
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