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Signal-to-noise ratio response table of TFC for extracting PM by various factors.
| Level | Time (min) | Temp. (℃) | Solvent concentration (v/v %) | Solid–liquid ratio |
|---|---|---|---|---|
| 1 | 30.08 | 29.78 | 30.97 | 29.99 |
| 2 | 29.66 | 29.96 | 30.32 | 29.96 |
| 3 | 29.99 | 29.98 | 28.43 | 29.79 |
| Delta | 0.42 | 0.20 | 2.54 | 0.20 |
| Rank | 2 | 4 | 1 | 3 |
