Factor | Name | Lowe level | High level |
A | [Oxalic acid:sulfuric acid] | 0 | 2 |
B | Acid concentration (% w/w) | 10 | 30 |
C | Ratio of liquid to solid (g/L) | 5 | 10 |
D | Temperature (˚C) | 70 | 160 |
E | Dissolution time (h) | 2 | 4 |