Development of Fundamental Data on Chemical Speciation and Solubility for Strontium and Americium in High-Level Waste: Predictive Modeling of Phase Partitioning During Tank Project Summary, 2002.

Felmy, A. R. ; Choppin, G. ; Dixon, D. A.

Technical Information Center Oak Ridge Tennessee

关键词: Fission products;    Waste processing;    Americium;    Strontium;    Actinides;   

RP-ID  :  DE2004833734

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

In this project, Pacific Northwest National Laboratory (PNNL) and Florida State University (FSU) are investigating the speciation of Sr and Am/Cm in the presence of selected organic chelating agents over ranges of hydroxide, carbonate, ionic strength, and competing metal ion concentrations present in high-level waste (HLW) stored in tanks at Hanford and other U.S. Department of Energy (DOE) sites. The chelating agents that are being studied are EDTA (ethylenediaminetetraacetic acid), HEDTA (N-(2-hydroxyethyl) ethylenediaminetriacetic acid), NTA (nitrilotriacetic acid), IDA (iminodiacetic acid), citrate, and oxalate.In fiscal year 2002, we focused our efforts on the following three areas: 1. finalizing our studies of Cm(III) speciation in the presence of the organic chelates 2. developing an accurate chemical model for thecomplexation of Sr with EDTA and HEDTA. 3. adding Pitzers equations to the Environmental Simulation Program (ESP).