What are Scaling Laws?

The law of proportion refers to the relationship between the ratio of different cations adsorbed by the soil and the activity ratio of these cations in the soil equilibrium solution. According to Donnan's theory, Schofield proposed the famous law of proportionality. The original meaning of this law is that when the cations in a dilute solution are in equilibrium with a large number of exchangeable cations, if the activity of monovalent cations in the solution changes by a certain ratio, the activities of all divalent ions change by the square of this ratio. The activity of all trivalent ions is changed by the cube of this ratio, the change of the solution concentration will not destroy the balance of the original solution, and the proportion of various cations adsorbed by the soil will not change. ^[1]