Parameter | Method I | Method II | Method III |
---|---|---|---|
Concentration range (μg/mL) | 1.0-20.0 | 4.0-40.0 | 1.5-30.0 |
Limit of detection (LOD) (μg/ml) | 0.09 | 1.06 | 0.06 |
Limit of quantification (LOQ) (μg/mL) | 0.26 | 3.2 | 0.18 |
Correlation coefficient (r) | 0.9998 | 0.9995 | 0.9996 |
Slope | 0.0392 | 0.0150 | 0.0384 |
Intercept | 0.0167 | 0.0134 | -0.0401 |
Standard deviation of the residuals (Sy/x) | 7.80 × 10-3 | 6.74 × 10-3 | 1.00 × 10-2 |
Standard deviation of the intercept (Sa) | 1 × 10-3 | 4.80 × 10-3 | 6.98 × 10-4 |
Standard deviation of the slope (Sb) | 4.67 × 10-4 | 2.36 × 10-4 | 4.80 × 10-4 |
%RSD | 1.11 | 1.21 | 1.27 |
% Error (% RSD/√n) | 0.45 | 0.54 | 0.52 |
Molar absorptivity (ε) (l/mol./cm.) | 1.32 × 104 | 5.2 × 103 | 1.22 × 104 |