Chemical Speciation of Inorganic Compounds under Hydrothermal Conditions

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This project utilizes the high-intensity x-rays available at the Advance Photon Source (APS) to study the inorganic chemistry associated with tank waste vitrification. Although the chemical conversion of waste under high-temperature conditions is an integral part of these processing technologies, there is virtually no information in the published literature about the chemical speciation of inorganic compounds under actual processing conditions. This is primarily due to the lack of techniques that are capable of making in situ measurements of aqueous systems above 300 C. The ongoing x-ray-based studies are identifying the chemical species, oxidation states and ion pairing of inorganic compounds ... continued below

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Stern, Edward A.; Fulton, John L. & Seidler,Gerald June 1, 2000.

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Description

This project utilizes the high-intensity x-rays available at the Advance Photon Source (APS) to study the inorganic chemistry associated with tank waste vitrification. Although the chemical conversion of waste under high-temperature conditions is an integral part of these processing technologies, there is virtually no information in the published literature about the chemical speciation of inorganic compounds under actual processing conditions. This is primarily due to the lack of techniques that are capable of making in situ measurements of aqueous systems above 300 C. The ongoing x-ray-based studies are identifying the chemical species, oxidation states and ion pairing of inorganic compounds under extreme solvent conditions. It is imperative to make in situ measurements since we have shown that the chemical speciation is strongly dependent on temperature. Several complimentary techniques are being used in this study including x-ray absorption fine structure (XAFS), diffuse anomalous x-ray scattering (DAS) and vibrational (IR & Raman) spectroscopy. Thus, the results of this work are providing information critical to the calcining and vitrification of tank wastes. The results will also have a direct bearing on specific issues such as volatility of Tc (or Re) compounds and the complex chemistry of chromium compounds.

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  • Other Information: PBD: 1 Jun 2000

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  • Report No.: EMSP-60050--2000
  • Grant Number: FG07-97ER14818
  • DOI: 10.2172/828507 | External Link
  • Office of Scientific & Technical Information Report Number: 828507
  • Archival Resource Key: ark:/67531/metadc788707

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • June 1, 2000

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • April 21, 2016, 4:48 p.m.

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Stern, Edward A.; Fulton, John L. & Seidler,Gerald. Chemical Speciation of Inorganic Compounds under Hydrothermal Conditions, report, June 1, 2000; United States. (digital.library.unt.edu/ark:/67531/metadc788707/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.