From: Spectrophotometric determination of etodolac in pure form and pharmaceutical formulations
Parameter | A | B | C |
---|---|---|---|
λmax, nm | 510 | 521 | 726 |
Beer's conc. Range (μg mL-1) | 0.5–8.0 | 1.0–10 | 2.0–18 |
Ringbom conc. Range (μg mL-1) | 0.85–7.5 | 2.0–8.5 | 3.0–16.5 |
Detection limits (μg mL-1) | 0.065 | 0.104 | 0.228 |
Quantification limit (μg mL-1) | 0.217 | 0.347 | 0.76 |
Molar absorpitivity × 10 4(L mol-1 cm-1) | 1.812 | 1.876 | 1.039 |
Sandell sensitivity (ng cm-2) | 15.86 | 15.32 | 27.66 |
Regression equation a | |||
S y/x | 0.202 | 0.285 | 0.246 |
Intercept | 0.0078 | - 0.0018 | 0.0011 |
S a | 0.142 | 0.201 | 0.2007 |
± tSa | 0.365 | 0.517 | 0.516 |
Slope | 0.0582 | 0.066 | 0.036 |
S b | 0.0285 | 0.0365 | 0.018 |
± tSb | 0.0733 | 0.094 | 0.0462 |
Correlation coefficient (r) | 0.9999 | 0.9999 | 0.9997 |
Mean ± SD% | 99.87 ± 0.659 | 100.21 ± 0.727 | 99.875 ± 0.759 |
RSD% | 0.66 | 0.73 | 0.76 |
Variance | 0.434 | 0.528 | 0.576 |
SE | 0.269 | 0.297 | 0.31 |
Student, s t-valueb (2.571) | 1.16 | 0.323 | 1.07 |
Variance ratio F-test b (6.256) | 1.06 | 1.29 | 1.406 |