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| temperature-time | pH solution-time | pH solution-temperature | |
|---|---|---|---|
| temperature (°C) | 30, 40, 50, 60 °C | 30 °C | 30, 40, 50, 60 °C |
| time (min) | 10, 20, 30, 60 min | 10, 20, 30, 60 min | 30 min |
| pH solution | 6.0 | 4.0, 5.0, 6.0 | 4.0, 5.0, 6.0 |
