Fig. 5
From: Effect of pH on the surface charges of permanently/variably charged soils and clay minerals

The reduction rates of the SCNs of the permanently/variably charged soils when the pH decreases from approximately 11 to 4.
From: Effect of pH on the surface charges of permanently/variably charged soils and clay minerals

The reduction rates of the SCNs of the permanently/variably charged soils when the pH decreases from approximately 11 to 4.