Table 2.
The confirmation results of DES, DIE and HEX in twenty bovine urine samples spiked at 1 µg L−1, registered in the MRM mode
| Compound | MRM transition (m/z) | Average relative ion intensity ± SD for standards | Average relative ion intensity ± SD for urine spiked | Samples fulfilling confirmation criteria (%) |
|---|---|---|---|---|
| DES |
267.0 > 237.2
267.0 > 222.2 267.0 > 209.2 |
0.866 ± 0.007 0.266 ± 0.031 |
0.866 ± 0.018 0.284 ± 0.013 |
100.0 100.0 |
| DES-d6 | 273.3 > 237.2 | – | – | – |
| DIE | 265.1 > 236.2 265.1 > 93.0 |
0.17 ± 0.05 | 0.161 ± 0.002 | 100.0 |
| DIE-d2 | 266.8 > 93.1 | – | – | – |
| HEX | 269.0 > 133.0 269.0 > 119.0 |
0.487 ± 0.008 | 0.491 ± 0.008 | 100.0 |
| HEX-d4 | 273.3 > 121.1 | – | – | – |
aThe most intense transitions in bold used for quantification