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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