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Assessing FES Density and Dissolution-independent Nitrate Desorption in Hyperalkaline Weathered Hanford Sediment
 

Summary: Assessing FES Density and Dissolution-independent Nitrate Desorption in Hyperalkaline
Weathered Hanford Sediment
Yi-Ting (Emmy) Deng
Crop and Soil Sciences Seminar
Wednesday March 2, 2011 at 3:35 PM
Room 2401, Miller Plant Sciences Building
The Department of Energy's Hanford Site poses the largest environmental cleanup project in
the U.S. due to the complexity and extent of radioactive contamination. A main thrust in
evaluating potential remediation solutions is the development of accurate reactive-transport
models. Existing models that have been applied to the Hanford Site contamination do not
adequately address the impact of de novo mineral formation generated by contact of the
hyperalkaline (pH >13) waste with sediments in the "near field" (close to the contaminant
source). These minerals, such as NO3-feldspathoids, are known to sequester Cs and Sr and
could serve as a potential long-term dissolution source should they ever be exposed to less
alkaline pore waters. Thus, both mineral dissolution and ion exchange dynamics must be
considered to accurately forecast the stability of waste-impacted sediments. The overall goal
of my research is to use experimental methods to understand the mechanism of Cs desorption
from hyperalkaline weathered Hanford sediments. Specifically, this involves: (1) conducting
a very long-term (three month) leaching to determine if Cs desorption from the
NO3-feldspathoids can occur without feldspathoids dissolution; and (2) directly measuring

  

Source: Arnold, Jonathan - Nanoscale Science and Engineering Center & Department of Genetics, University of Georgia

 

Collections: Biotechnology