| Amount Taken (µg/mL) | Amount Added (µg/mL) | Total amount foundb (µg/mL) (Mean ± SDc) | Recovery (%) | RSD (%) | |
| Derivative spectrophotometric methodsa | |||||
| RPG | 5.0 | 5.0 | 9.996 ± 0.092 | 99.96 | 0.23 |
| 10.0 | 15.213 ± 0.022 | 101.42 | 0.37 | ||
| 20.0 | 25.105 ± 0.067 | 100.42 | 0.19 | ||
|
MTF | 5.0 | 5.0 | 10.010 ± 0.046 | 100.10 | 0.71 |
| 10.0 | 14.998 ± 0.032 | 99.99 | 0.86 | ||
| 20.0 | 25.012 ± 0.011 | 100.05 | 0.24 | ||
| HPLCa | |||||
| RPG | 5.0 | 5.0 | 10.080 ±0.017 | 100.80 | 0.32 |
| 10.0 | 15.116 ± 0.066 | 100.77 | 0.65 | ||
| 20.0 | 24.933 ± 0.044 | 99.73 | 0.22 | ||
| MTF | 20.0 | 5.0 | 25.069 ± 0.028 | 100.28 | 0.56 |
|
|
| 10.0 | 30.160 ± 0.038 | 100.53 | 0.38 |
| 20.0 | 40.460 ± 0.069 | 101.15 | 0.22 | ||