Development of advanced in situ techniques for chemistry monitoring and corrosion mitigation in SCWO environments. 1997 annual progress report

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'This report evaluates the first year''s results of the research on the development of advanced electrochemical sensors for use in high subcritical and supercritical aqueous environments. The work has emphasized the designing of an advanced reference electrode, and the development of high-temperature pH and redox sensors for characterizing the fundamental properties of supercritical aqueous solutions. Also, electrochemical noise sensors have been designed for characterizing metal/water interactions, including corrosion processes. A test loop has been designed and constructed to meet the expected operation conditions. The authors have also developed an approach to define a practical pH scale for use with supercritical ... continued below

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29 pages

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Meng, Z.; Zhou, X.Y.; Lvov, S.N. & Macdonald, D.D. October 1, 1997.

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Description

'This report evaluates the first year''s results of the research on the development of advanced electrochemical sensors for use in high subcritical and supercritical aqueous environments. The work has emphasized the designing of an advanced reference electrode, and the development of high-temperature pH and redox sensors for characterizing the fundamental properties of supercritical aqueous solutions. Also, electrochemical noise sensors have been designed for characterizing metal/water interactions, including corrosion processes. A test loop has been designed and constructed to meet the expected operation conditions. The authors have also developed an approach to define a practical pH scale for use with supercritical aqueous systems and an operational electrochemical thermocell was tested for pH measurements in HCl + NaCl aqueous solutions. The potentials of the thermocell for several HCl(aq) solutions of different concentrations have been measured over wide ranges of temperature from 25 to 400 C and for flow rates from 0.1 to 1.5 cm min{sup -1} . The corresponding pH differences ({Delta}pH) for two HCl(aq) concentrations in 0.1 NaCl(aq) solution have been experimentally derived and thermodynamically analyzed. Their first experimental measurements, and subsequent theoretical analysis, clearly demonstrate the viability of pH measurements in high subcritical and supercritical aqueous solutions with a high accuracy of \2610.02 to 0.05 units.'

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29 pages

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  • Other: DE00013442
  • Report No.: EMSP-55171--97
  • Grant Number: NONE
  • DOI: 10.2172/13442 | External Link
  • Office of Scientific & Technical Information Report Number: 13442
  • Archival Resource Key: ark:/67531/metadc622429

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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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  • October 1, 1997

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • June 13, 2016, 4:27 p.m.

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Meng, Z.; Zhou, X.Y.; Lvov, S.N. & Macdonald, D.D. Development of advanced in situ techniques for chemistry monitoring and corrosion mitigation in SCWO environments. 1997 annual progress report, report, October 1, 1997; United States. (digital.library.unt.edu/ark:/67531/metadc622429/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.