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Recovery of first-order derivative UV spectra (n = 3).
| Sample * | Added (μg/mL) | Test (μg/mL) | Recovery (%) | Average Recovery (%) | RSD (%) |
|---|---|---|---|---|---|
| COSA | 20.0 | 19.6 ± 0.29 | 98.5 ± 1.5 | 98.1 | 0.63 |
| COSA | 40.0 | 38.9 ± 0.32 | 97.3 ± 1.2 | ||
| COSA | 60.0 | 59.2 ± 0.25 | 98.7 ± 1.2 | ||
| COSB | 20.0 | 19.5 ± 0.27 | 97.5 ± 1.7 | 98.4 | 0.62 |
| COSB | 40.0 | 39.6 ± 0.34 | 99.0 ± 1.9 | ||
| COSB | 60.0 | 58.9 ± 0.28 | 98.1 ± 1.7 |
* Concentration of COSA and COSB in the pre-analyzed samples is 100 μg/mL.
