| Comp. No. | Exhaustion (%) | ||||
| pH 3 | pH 4 | pH 5 | pH 6 | pH 7 | |
| 8 | 55 | 62 | 66.5 | 57.0 | 50 |
| 9 | 72 | 84 | 88.5 | 75.5 | 68 |
| 10 | 60 | 67 | 70.0 | 63.5 | 55 |
| 11 | 50 | 56 | 60.0 | 52.0 | 45 |