Mineralogic Residence and Desorption Rates of Sorbed 90Sr in Contaminated Subsurface Sediments: Implications to Future Behavior and In-Ground Stability

Zachara, PIs: John M. ; McKinley, Jim P. ; Heald, S. M. ; Liu, Chongxuan ; Lichtner, Peter C.

Pacific Northwest National Laboratory (U.S.)

关键词: Desorption;    12 Management Of Radioactive Wastes, And Non-Radioactive Wastes From Nuclear Facilities;    Sediments;    38 Radiation Chemistry, Radiochemistry, And Nuclear Chemistry;    Kinetics;   

DOI  :  10.2172/895734
RP-ID  :  ERSD-90230-2006
RP-ID  :  None
RP-ID  :  895734

美国|英语

来源: UNT Digital Library

【 摘 要 】

The project is investigating the adsorption/desorption process of 90Sr in coarse-textured pristine and contaminated Hanford sediment with the goal to define a generalized reaction-based model for use in reactive transport calculations. While it is known that sorbed 90Sr exists in an ion exchangeable state, the mass action relationships that control the solid-liquid distribution and the mineral phases responsible for adsorption have not been defined. Many coarse-textured Hanford sediment display significant sorptivity for 90Sr, but contain few if any fines that may harbor phyllosilicates with permanent negative charge and associated cation exchange capacity. Moreover, it is not known whether the adsorption-desorption process exhibits time dependence within context of transport, and if so, the causes for kinetic behavior.