In the present study the M ouml

In order to characterize the experimental setup used in the column displacement studies, a potassium bromide solution was injected as a tracer because it is not adsorbed onto Imatinib and yields good information about the hydrodynamics of the experimental setup. Thus, an aqueous stream containing 100.0 mg L−1 of KBr was pumped through the column at a constant upward flow of 0.146 cm3 min−1. The effluent concentration of KBr was then monitored by potentiometry until it reached a constant value equal or close to the inlet concentration, which indicated that the soil was saturated and the adsorption process was completed or reached a stationary state. The desorption process was initiated by switching instantaneously the inlet solution to Milli-Q water. The KBr concentration of the effluent was again monitored until pituitary gland fell below the quantification limits of the analytical procedure. The modeling of the response curve for tracer enables determining the porosity in the experimental column, which should be similar to field porosity, and detecting any dead volume inside the experimental installation. This volume is used to correct the retained LAS in the column for a better quantification of the adsorption of these chemicals.