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Independent factors and their levels used in the BDD for optimization of SPME-Arrow extraction for determination of free volatile compounds.
| Factors | Factor Levels | ||
|---|---|---|---|
| Coded levels | −1 | 0 | 1 |
| A: Extraction temperature (°C) | 40 | 50 | 60 |
| B: Incubation time (min) | 10 | 20 | 30 |
| C: Exposure time (min) | 30 | 45 | 60 |
| D: Desorption time (min) | 5 | 7.5 | 10 |
