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Characterization of U(VI) speciation in samples from laboratory batch and column experiments


EMSL Project ID
4790

Abstract

Our DOE funded projects under the EMSP and NABIR programs focus on the biogeochemical properties of U(VI) in contaminated subsurface environments. Our laboratory batch and column experiments are designed to understand how U(VI) behaves under different, environmentally relevant conditions, and to identify dominant U(VI) solution complexes and precipitates. Conventional powder XRD and TEM methods were used and could not meet all the needs. We proposed to use the Fluorenscence Spectrometer, and with help from Dr. Zheming Wang (experienced with using this instrument for uranium speciation) identify the U(VI) precipitates, and U(VI) solution complexes resulting from our batch and column experiments. The systems we are currently working on include: Na-UO2-CO3-H2O, Na-Ca-UO2-CO3-H2O, Na-Ca-UO2-PO4-CO3-H2O and possibly Na-Ca-UO2-PO4-SiO2-CO3-H2O.

Project Details

Project type
Exploratory Research
Start Date
2003-09-02
End Date
2005-09-09
Status
Closed

Team

Principal Investigator

Jiamin Wan
Institution
Lawrence Berkeley National Laboratory