Fig. 1. Schematic diagram of determination of solute adsorption by the transient, unsaturated flow method. Initial liquid phase concentration of solute species i, C_in, and initial adsorption by soil, Q_in, are obtained from the M_i vs. (/) plot for x > x*. _s = water content at proximal end of soil column; _n = initial water content; M_in = initial solute content; = bulk density; x* = plane of separation