The greenness profile of the proposed NADES-DLLME method as determined by using the eco-scale tool.
| Items | Penalty points (PPs) | ||
|---|---|---|---|
| 1. Reagents | |||
| 1.1. Ethanol | Amount | <10 mL | 1 |
| Hazard type | Single word: danger | 2 | |
| Hazard amount | 2 Pictograms | 2 | |
| Total PPs = 4 | |||
| 1.2. Menthol | Amount | <10 mL | 1 |
| Hazard type | Single word: warning | 1 | |
| Hazard amount | 1 Pictogram | 1 | |
| Total PPs = 1 | |||
| 1.3. Acetic acid | Amount | <10 mL | 1 |
| Hazard type | Single word: danger | 2 | |
| Hazard amount | 2 Pictogram | 2 | |
| Total PPs = 4 | |||
| 1.4. NaCl | Amount | 0.4 g | 0 |
| Hazard type | 0 | 0 | |
| Hazard amount | 0 | 0 | |
| Total PPs = 0 | |||
| 2. Instruments | |||
| 2.1. Energy (kW h per sample) | LC-UV | ≤ 0.1 | 0 |
| 2.2. Occupational hazard | No hermetic sealing release of gas or vapor into air | 0 | |
| Total PPs = 0 | |||
| 3. Waste | |||
| 3.1. Waste amount | 1–10 mL | 3 | |
| 3.2. Waste treatment | No treatment | 3 | |
| Total PPs = 6 | |||
| Total penalty points | 15 | ||
| Eco-scale score | 100 − 15 = 85 | ||