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Quantitative parameters for methods A-C. |
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| Parameter |
A |
B |
C |
|
|
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| 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 |
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| Sy/x |
0.202 |
0.285 |
0.246 |
| Intercept |
0.0078 |
- 0.0018 |
0.0011 |
| Sa |
0.142 |
0.201 |
0.2007 |
| ± tSa |
0.365 |
0.517 |
0.516 |
| Slope |
0.0582 |
0.066 |
0.036 |
| Sb |
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 |
|
a A = a + b c, where c is the concentration in μg mL-1. b The theoretical t- and F-values, 2.571 and 6.256, respectively for five degree of freedom at 95% confidence level. | |||
Gouda and Hassan Chemistry Central Journal 2008 2:7 doi:10.1186/1752-153X-2-7 |
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