| Parameters |
p-CLA |
TCNQ |
QUIZ |
ARS |
| Wavelengths λmax (nm) |
532 |
840 |
554 |
534 |
| Beer’s law limits (µg mL-1) |
10-140 |
3.0-30 |
2.0-20 |
1.0-10 |
| Molar absorptivity ε,
(L/mol-1 cm-1) x 104 |
0.7287 |
1.045 |
1.286 |
2.0076 |
| Sandell,s sensitivity (ng cm-2) |
39.43 |
274. 9 |
22.35 |
14.31 |
| Regression equation a |
|
|
|
|
| Slope (b) |
0.0035 |
0.0267 |
0.0394 |
0.0679 |
| Intercept (a) |
0.0027 |
- 0.0098 |
- 0.0039 |
0.0041 |
| Correlation coefficient (r) |
0.9996 |
0.9991 |
0.9997 |
0.9998 |
| Mean recovery % ± SD |
100.64 ± 0.61 |
99.90 ± 1.01 |
99.66 ± 0.574 |
99.61 ± 0.892 |
| RSD% |
0.614 |
1.01 |
0.576 |
0.895 |
| RE% |
0.644 |
1.06 |
0.605 |
0.94 |
| LOD, (µg mL-1) b |
1.97 |
0.494 |
0.285 |
0.186 |
| LOQ, (µg mL-1) b |
6.57 |
1.65 |
0.95 |
0.619 |
| Calculated t-value c |
1.72 |
0.11 |
0.78 |
0.71 |
| Calculated F-value c |
1.10 |
2.49 |
1.24 |
1.94 |
aA = a + bC, where C is the concentration in μg mL-1, A is the absorbance units, a is the intercept, b is the slope.
bLOD, limit of detection; LOQ, limit of quantification; ε, molar absorptivity.
cThe theoretical values of t and F are 2.57 and 5.05, respectively at confidence limit at 95% confidence level and five degrees of freedom (p= 0.05). |
