Table 2.
Wavelength for maximum absorption, molar absorptivity, specific absorptivity, Sandell’s sensitivity, Ringbom range and statistical studies in case of diazepam complexes
| Picric acid | 3,5-dinitrobenzoic acid | 2,4-dinitrobenzoic acid | |
|---|---|---|---|
| λmaxnm | 475 | 500 | 500 |
| ε | 2.89 × 103 | 1.03 × 103 | 4.30 × 103 |
| a | 10.14 | 3.63 | 15.00 |
| I | -0.02 | 0.05 | -0.20 |
| r | 1.00 | 0.99 | 0.99 |
| S | 4.79 ×10-3 | 8.03 ×10-2 | 7.20 ×10-2 |
| $ ×105 | 9.86 | 27.55 | 6.67 |
| Conc µg/ml* | 85.6 | 180.6 | 128.6 |
| Ringbom range µg/ml | 10.0-79.0 | 15.2-177.8 | 17.0-83.0 |
λmax, Wavelength for maximum absorption (nm); ε, Molar absorptivity l mol-1 cm-1; a, Specific absorptivity l g-1 cm-1; I, Intercept of calibration curve; r, Correlation coefficient of the calibration curve; S, Standard deviation of the calibration curve; $, Sandell’s sensitivity µg cm-2.
*
Obedience of Beer’s law up to this concentration.