Assessment of transportation processes of polyacrylamide in chernozem and saline soil by numerical model.

Polyacrylamide (PAM) was studied in two characteristic soils in Daqing City: chernozem and saline soil. 120 mg L of KBr was used as a conservation tracer to estimate diffusion coefficients and pore velocities of chernozem and saline soil by using the breakthrough curves (BTCs) of Br. Isothermal adsorption equations were coupled with the traditional two-site model to establish the transportation equation of PAM.