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Table 2 Calibration, regression, quantitative and sensitivity parameters

From: Application of two charge transfer complex formation reactions for selective determination of metformin hydrochloride in pharmaceuticals and urine

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
  1. aY = mx + b, where Y: absorbance, X: [MEB] in μg mL-1, b: intercept and m: slope