DE FG02-06ER64193: Final Technical Report Nucleation and Precipitation Processes in the Vadose Zone during Contaminant Transport

Kathryn L. Nagy

关键词: NITRATES;    NUCLEATION;    PRECIPITATION;    SCATTERING;    SEDIMENTS;    SOILS;    SPECTROSCOPY;    TRANSPORT;    URANIUM;    URANIUM DEPOSITS;    X-RAY DIFFRACTION uranyl-silicate;    uranium(VI);    HEXS;    pdf;    boltwoodite;    soddyite;   

DOI  :  10.2172/1045138
RP-ID  :  DOE/ER/64193
PID  :  OSTI ID: 1045138
Others  :  TRN: US1203654

美国|英语

来源: SciTech Connect

【 摘 要 】

The report describes results of experiments to synthesize and characterize uranium(VI)-silicates from solutions containing dissolved U(VI), Si, Na, and nitrate as a function of solution pH and Si:U ratio under ambient conditions. Solids characterization was accomplished by X-ray diffraction, attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), and high-energy X-ray scattering (HEXS) analysis. The purpose was to develop a framework for describing the formation of U(VI)-silicate solids that might form in contaminated soils and sediments under oxidizing conditions in the presence of aqueous uranium, and are known to exist naturally in geologic uranium deposits.