Table 3.
Orthogonal test design of four independent variables.
| Independent variables (%, w:w) |
||||
|---|---|---|---|---|
| Levels | Sodiumalginate | Attapulgite | Calcium carbonate | Calcium chloride |
| 1 | 2.5 | 0.5 | 3 | 2 |
| 2 | 3 | 0.75 | 5 | 3 |
| 3 | 3.5 | 1.0 | 7 | 4 |
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