Research Article
Determination of Methomyl Residue in Tobacco Samples by Heart-Cutting Two-Dimensional Liquid Chromatography with Tandem Mass Spectrometry
Table 1
1D-LC and 2D-LC gradient for methomyl analysis.
| | Time (min) | 1D-LC | 2D-LC | | %B | Flow rate (mL/min) | %B | Flow rate (mL/min) |
| | 0 | 5 | 0.4 | 5 | 0.4 | | 3 | 5 | 0.4 | — | — | | 8 | 23 | 0.4 | 5 | 0.4 | | 9 | 25 | 0.2 | — | — | | 12 | — | — | 5 | 0.2 | | 13 | 30 | 0.2 | — | — | | 14 | — | — | 5 | 0.4 | | 17 | — | — | 25 | 0.4 | | 18 | 100 | 0.4 | — | — | | 20 | — | — | 100 | 0.4 | | 23 | 100 | 0.4 | — | — | | 23.1 | 5 | 0.4 | — | — | | 25 | — | — | 100 | 0.4 | | 25.1 | — | — | 5 | 0.4 |
|
|
