Two-constant equation was the best model to describe the sorption kinetics of Cd~(2+) and Pb~(2+),followed by Elovich equation,and the worst model was first-order dynamics equation.

• 双常数方程是描述根际、非根际土Cd2+和Pb2+吸附动力学行为的最优模型；其次为Elovich方程；最差模型是一级动力学方程.