Evaluating non-equilibrium solute transport in small soil columns

摘要

Displacement studies on leaching of bromide and two pesticides (atrazine and isoproturon) were conducted under unsaturated steady state flow conditions in 24 small undisturbed soil columns (5.7 cm in diameter and 10 cm long) each collected from two sites differing in soil structure and organic carbon content in North Germany. There were large and irregular variabili- ties in the characteristics of both soils, as well as in the shapes of bereakthrough curves (BTCs) of different columns, including some with early brakthrough and increased tailing, qualitatively indicating the presence of preferential flow.