Parameter | PCA method | DDQ method |
---|---|---|
λmax, nm | 530.0 | 460.0 |
Color stability, min | 150.0 | 180.0 |
Linear range, μg mL-1 | 8.0–320.0 | 1.6–64.0 |
Range, μg mL-1 | 312.0 | 62.4 |
Molar absorptivity(ε), L mol-1 cm-1 | 7.33 × 102 | 2.57 × 103 |
Sandell sensitivity, μg cm-2 | 0.3620 | 0.0644 |
DL, μg mL-1 | 0.88 | 0.52 |
QL, μg mL-1 | 2.67 | 1.72 |
Regression equation, Ya | ||
 Intercept, b | 0.0068 | 0.0198 |
 Slope, m | 0.0029 | 0.0136 |
 Standard deviation of m, Sm | 1.29 × 10-3 | 1.42 × 10-3 |
 Standard deviation of b, Sb | 1.01 × 10-4 | 2.2 × 10-4 |
 Regression coefficient, r | 0.9992 | 0.9991 |