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Nominal and measured concentrations of working stock solutions used for preparing β-blocker exposure mixtures.
| Test Drug | Nominal Conc. | Measured Conc. | Recoveries |
|---|---|---|---|
| ng/L | ng/L | % | |
| Propranolol | 1000 | 844 ± 157 | 84 |
| Propranolol | 10000 | 11078 ± 204 | 111 |
| Metoprolol | 2000 | 2056 | 103 |
| Metoprolol | 20000 | 17294 ± 181 | 87 |
