Figure 4From: Experimental system to displace radioisotopes from upper to deeper soil layers: chemical research Radioactivity distribution in the uncontaminated soil at the end of the column B experiment. (a) The column B experiment. The column is held by a stand; the bottom end is closed by a glass stopcock, filled with cotton to prevent loss of the soil sample; a beaker is placed under the column to collect the eluates from the stopcock; (b) Radioactivity level of the six soil fractions, corresponding to each segments of the column B experiment. Activity values are in DPM/g. The highest radioactivity values are found in correspondence of the second and the third fraction, due to the complexing and buffering soil power.Back to article page