Table 1.
Analyte | Peak Potential a | Response b | MSE c | Fitting Parameters | Baseline d | LOD e | ||
---|---|---|---|---|---|---|---|---|
a | b | x0 | ||||||
BPA | Epa = 0.540 | Hyperbolic | 74.6 | 6.9 × 10−3 | 7.2 × 10−4 | – | 0.99 | 120 |
CdCl2 | Epa = −0.756 | Sigmoidal | 27.5 | 36 | 240 | 820 | 1.96 | 320 |
CuSO4 | Epa = −0.228 | Hyperbolic | 126.2 | 4.4 × 10−3 | 2.8 × 10−4 | – | 1.15 | 140 |
DQBr2 | Epc = −0.536 | Hyperbolic | 90.3 | −0.079 | 3 × 10−3 | – | −4.41 | 130 |
HgCl2 | Epa = 0.108 | Linear | 38.1 | 0.0115 | 0.117 | 1.39 | 340 | |
MeP | Epa = 0.052 | Hyperbolic | 24.9 | 3.0 × 10−4 | 4.2 × 10−4 | – | 1.06 | 380 |
PbCl2 | Epa = −0.568 | Sigmoidal | 152.7 | 4.2 | 170 | 740 | 1.37 | 350 |
PQCl2 | Epc= −0.536 | Hyperbolic | 38.6 | −0.18 | 6.3 × 10−3 | – | −4.80 | 70 |
a Peak potential vs. Ag/AgCl used for the dose response of analyte; Epa = anodic peak potential, Epc = cathodic peak potential; b Sigmoidal = Equation(1) and Hyperbolic = Equation (2); c Mean Standard Error; d Baseline is the average value of current at the peak potential used at zero concentration in μA. e The limit of detection (LOD) in ppb is estimated using the equation LOD = 3 s/m, where s is the standard deviation of the lowest measureable signal and m is the corresponding slope.