Interday and intraday reproducibility (% RSD) as well as recovery for urine spiked sample (n = 6) using mixed-adsorbent.
| Parameter, spiked level (μg L−1) | MET | BUF | PHEN | PROP |
|---|---|---|---|---|
| Intraday (% RSD, n = 6) | ||||
| 600 | 6.66 | 6.91 | 7.35 | 8.40 |
| 750 | 5.16 | 8.28 | 8.62 | 6.90 |
| 950 | 4.99 | 6.27 | 5.73 | 5.87 |
| Interday (% RSD, n = 6) | ||||
| 600 | 8.28 | 8.62 | 8.55 | 9.12 |
| 750 | 8.02 | 8.87 | 9.01 | 7.80 |
| 950 | 6.50 | 7.23 | 7.41 | 7.67 |
| Recovery (%) | ||||
| 600 | 85.4 ± 8.98 | 84.6 ± 10.2 | 109 ± 8.15 | 97.0 ± 8.58 |
| 750 | 75.1 ± 6.92 | 72.8 ± 8.53 | 114 ± 13.5 | 116 ± 16.7 |
| 950 | 80.9 ± 4.57 | 81.2 ± 1.76 | 116 ± 8.95 | 97.8 ± 7.06 |