Parameter | Level | ||
1 | 2 | 3 | |
pH | 0 | 1.5 | 3 |
Temperature (Celsius) | 25 | 35 | 45 |
Time (hour) | 0.5 | 1 | 1.5 |
Iron powder (stoichiometric amount) | 1 | 1.5 | 2 |