2008 Volume 52 Pages 397-402
In general, hydro-geochemical characteristics of field soil porous media are distributed with large heterogeneity. This heterogeneity affects not only physical parameters but also chemical parameters. Evaluation of chemical and physical heterogeneity effects on transport of contaminant species is important to understand basic transport characteristics of field soils. In this study, laboratory experiment of solute transport in heterogeneous field with cation exchange reaction was carried out. Electric conductivities (EC) were measured by time domain reflectometry (TDR) using small printed circuit board probes (PCBP) . Transient concentrations of cations and anions of eluted water were analyzed by ion chromatography. Breakthrough curves (BTC) of injected K+ and Cl- showed split peeks that may be the effect of heterogeneity of the flow field. According to cations BTC, Ca and Mg were exchanged with K and then flushed out. Both of chemical and physical heterogeneity affects on solute transport clearly.
