Nucleation and Precipitation Processes in the Vadose Zone during Contaminant Transport: Final Technical Report

Nagy, Kathryn L.

University of Illinois at Chicago, Chicago, IL

关键词: Uranyl-Silicate, Uranium(Vi), Hexs, Pdf, Boltwoodite, Soddyite;    Uranium;    Uranium Deposits;    Sediments;    Nucleation;   

DOI  :  10.2172/1045138
RP-ID  :  DOE/ER/64193
RP-ID  :  FG02-06ER64193
RP-ID  :  1045138

美国|英语

来源: UNT Digital Library

【 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.