Insights into transport velocity of colloid-associated plutonium relative to tritium in porous media

摘要

Although faster transport velocities of colloid-associated actinides, bacteria, and virus than nonreactive solutes have been observed in laboratory and field experiments, some questions still need to be answered. To accurately determine the relative velocity (UPu/UT) of ²³⁹Pu and tritium representative of the bulk water, a conceptual model of electrostatic interactions coupled with the parabolic water velocity profile in pore channels is developed. Based on the expression for UPu/UT derived from this model, we study the effects of water flow rates and ionic strengths on the UPu/UT. Also, the velocity relationship between Pu, tritium and Sr²⁺ is explored. The results show that UPu/UT increased fairly linearly with decreasing water flow rates; UPu/UT declined approximately exponentially with increasing Na⁺ concentrations; the charge properties of colloid-associated Pu (negative), tritium (neutral) and Sr²⁺ (positive) had a close association with their transport velocities as UPu : UT : USr²⁺ = 1.41 : 1 : 0.579.