Table 2.
Linear regression equations show the dependence of redox peak current Ip on the square root of scan rate ν1/2 (V/s)1/2 for controlled diffusion and dependence of redox peak current Ip on scan rate ν (V/s) for controlled adsorption for phenolic compounds at bare CPE and MCPE with their slopes and R-square values.
| Phenolic Compounds | Regression Equation Ipa on ν1/2 (V/s)1/2 Controlled Diffusion |
R2 Value | Regression Equation Ipa versus Scan Rate ν (V/s) Controlled Adsorption |
R2 Value |
|---|---|---|---|---|
| Sinapic acid (CPE) | Ipa (μA) = 7.7340 ν1/2 − 1.5106 | 0.9545 | Ipa (µA) = 9.4885 ν − 0.1137 | 0.9988 |
| Sinapic acid MCPE) | Ipa (μA) = 17.1927 ν1/2 − 0.4542 | 0.9848 | Ipa (µA) = 20.6984 ν + 2.7275 | 0.9880 |
| Syringic acid (CPE) | Ipa (μA) = 1.8253 ν1/2 + 0.5594 | 0.9923 | Ipa (µA) = 2.1349 ν + 0.9093 | 0.9333 |
| Syringic acid (MCPE) | Ipa (μA) = 3.0278 ν1/2 + 0.3438 | 0.9977 | Ipa (µA) = 3.5624 ν + 0.9202 | 0.9510 |
| Rutin (CPE) | Ipa (μA) = 1.3556 ν1/2 − 0.1777 | 0.9805 | Ipa (µA) = 1.6414 ν + 0.4267 | 0.9964 |
| Rutin (MCPE) | Ipa (μA) = 5.5898 ν1/2 − 0.5157 | 0.9906 | Ipa (µA) = 6.7137 ν + 0.5218 | 0.9885 |
CPE = Carbon Paste Electrode, MCPE = Iron oxide modified carbon paste electrode, Ipa = Anodic peak current, ν½ = Square root of scan rate, (V/s)1/2 = square root of volt per second.