Figure 5
From: Characteristics of Cadmium Sorption by Heat-Activated Red Mud in Aqueous Solution

Correlation between Cd(II) sorption experimental result and model prediction. The diagonal line indicates equality between experimental result and model prediction. qe is the amount of Cd(II) sorbed. r (correlation coefficient) is a parameter of Pearson’s correlation analysis between experimental result and model prediction. **Indicates correlation is significant at 0.01 level.