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The levels of variables central composite statistical experiment design
| Factor | Variables | Low actual | High actual | Mean | Std. Dev. |
|---|---|---|---|---|---|
| A | pH | 2.012 | 7.500 | 9.75 | 5.25 |
| B | Contact time (min) | 24.597 | 65.000 | 92.50 | 37.50 |
| C | Concentration of diazinon(mg/L) | 8.721 | 20.500 | 30.25 | 10.75 |
| D | Dose of NPs (mg/L) | 201.246 | 550.000 | 775.00 | 325.00 |
