Table 2. Experimental Factors with Lower and Higher levels.
| factor | – | + |
|---|---|---|
| pH | 1.6 | 5 |
| temperature (°C) | 25 | 60 |
| urea (M) | 0 | 1 |
| ionic strength (M) | 0.02 | 1 |
| stirring | off | on |
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