| Time (min) | pH 5.09 | pH 4.37 | pH 3.85 | pH 3.00 | pH 2.50 |
| 1 | 0.000 |
|
|
| >1 |
| 2 | 0.000 | 0.000 | 0.000 | 0.121 |
|
| 3 | 0.000 |
|
|
|
|
| 4 | 0.000 | 0.000 | 0.024 | 0.380 |
|
| 5 | 0.000 |
|
| 0.649 |
|
| 6 | 0.000 | 0.043 | 0.036 | 0.902 |
|
| 7 | 0.000 |
|
|
|
|
| 8 | 0.058 | 0.136 | 0.080 | 1.643 |
|
| 9 | 0.102 |
|
|
|
|
| 10 | 0.183 | 0.205 | 0.202 |
|
|
| 11 | 0.280 |
|
|
|
|
| 12 | 0.414 | 0.439 | 0.611 |
|
|
| 13 | 0.611 |
|
|
|
|
| 14 | 0.789 | 0.918 | 1.236 |
|
|
| 15 | 1.058 |
|
|
|
|
| 16 | 1.374 | 1.700 | 1.696 |
|
|