Table 6 Penalty points (PPs) for the proposed and reported methods
Parameters | Penalty points (PPs) | |
|---|---|---|
Proposed method | Reported method [12] | |
Reagents | ||
Britton- Robinson buffer | 1 | - |
Methanol | 6 | - |
Water | 0 | 0 |
Tetrahydrofuran | - | 6 |
Trifluoracetic acid | - | 4 |
Acetonitrile | - | 4 |
Instrument | ||
Energy | 0 (≤ 0.1 kWh per sample) | 1 (> 0.1 kWh per sample) |
Occupational hazard | 0 | 3 |
Waste | 3 | 5 |
Total PPs | Æ© 10 | Æ© 23 |
Analytical Eco-scale score | 90 Great green analysis | 77 Great green analysis |