The Next-Generation Caustic-Side Solvent Extraction (NG-CSSX) was developed to enhance the ability to remove radioactive cesium from alkaline salt waste. This legacy waste from the Cold War, currently stored at the Savannah River Site, must be decontaminated before disposal.  This system includes the extractant molecule known as MaxCalix, a modifier, Cs-7SB, that helps increase the solubility of MaxCalix, and uses the commercial solvent, Isopar� as the diluent. A significant amount of data has been generated on the effects of anions (NO3-, NO2--, and OH-) on the cesium distribution ratio using NG-CSSX.  In order to better understand the extraction mechanism the behavior of sodium ion, a major interference to the extraction of cesium, must be characterized.   Sodium distribution under a variety of conditions has been measured by a radiotracer method.  This new information combined with previous data has allowed the development of a better understanding of the NG-CSSX system.

Distribution of sodium using the next-generation caustic-side solvent extraction

245th National Meeting (2013)

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