See more from this Session: Metals and Metaloids: I
The mobilization of cesium and strontium increased as the ionic strength of the infiltrating water increased, whereas the mobilization of colloids decreased as the ionic strength of the infiltrating water increased. Mobilization of both metals and colloids were hysteretic in response to changes in ionic strength – the amount of metals and colloids mobilized at a given ionic strength was not matched when the experiment was repeated following exposure to pore water of higher or lower ionic strengths. The amount of colloid mobilization hysteresis was positively correlated to dispersion of bromide, which was used as an indicator of the rate of exchange of pore water between the soil macropores and matrix. An exchange of pore water between the soil matrix and macropores was attributed as the primary reason for the hysteresis of metals and colloid mobilization during changes in ionic strength.