| Comp. No. | Exhaustion (%) | ||||
| pH 3 | pH 4 | pH 5 | pH 6 | pH 7 | |
| 8 | 80.0 | 77.0 | 66.5 | 41 | 33.5 |
| 9 | 91.5 | 88.5 | 79.5 | 66 | 60.0 |
| 10 | 82.0 | 79.0 | 68.5 | 43 | 35.0 |
| 11 | 75.5 | 74.0 | 60.0 | 37 | 30.0 |