Extraction recovery of metoprolol (x̄ ± s, n = 3).
| Drug | Concentration (μg mL−1) | Extraction recovery (%) | RSD (%) |
|---|---|---|---|
| Metoprolol | 0.5 | 84.87 ± 3.54 | 4.17 |
| 5 | 86.45 ± 4.18 | 4.84 | |
| 20 | 86.95 ± 4.42 | 5.08 |
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