COMPARISON OF EFFLUENT AND TDR BREAKTHROUGH CURVES OF ELECTRICAL CONDUCTIVITY IN A LABORATORY COLUMN

A b s t r a c t . Steady state downward flux was carried out in laboratory for 2 soil columns containing sand and aggregated loam. The bulk elekrical condictivity (EC) was measured at the bottom of the column by horizontally installed TDR probes. The bulk EC data were evaluated by continuous flow and convolution method and they were converted to relative concentrations, as were the effluent EC data. For sand, the relative concentrations obtained from the effluent were similar to those for TDR, while for aggregated loam there were significant discrepancies. The results w ere explained by the different pore distribution of the soils. K e y w o r d s : TDR (Time Domain Reflectometry), BTC (Breakthrough Curve), soil column, effluent