Table 2.
Experimental range and level of independent variables.
| Independent Variables | Symbol | Range and level | ||||
|---|---|---|---|---|---|---|
| −α | −1 | 0 | +1 | +α | ||
| pH | X1 | 4 | 4.81 | 6 | 7.19 | 8 |
| Concentration (mM) | X2 | 20 | 56.48 | 110 | 163.51 | 200 |
| Time (min) | X3 | 30 | 54.32 | 90 | 125.68 | 150 |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.