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Improved spectrophotometric analysis of barium styphnate

Description: A spectrophotometric procedure to determine the purity of barium styphnate monohydrate based upon the absorbance of the styphnate ion at 326 and 413.3 nm has been developed. The purity is determined by comparing the absorbance of the styphnate ion in barium styphnate and in styphnic acid. Our investigation has shown that the molar absorptivity and lambda maxima of the styphnate ion are quite pH dependent; therefore, the pH is buffered to 6.8 to 7.0 with ammonium acetate. Under these conditions … more
Date: January 1, 1983
Creator: Brown, N E & Blasi, J A
Partner: UNT Libraries Government Documents Department
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Status of radioiodine control for nuclear fuel reprocessing plants

Description: This report summarizes the status of radioiodine control in a nuclear fuel reprocessing plant with respect to capture, fixation, and disposal. Where possible, we refer the reader to a number of survey documents which have been published in the last four years. We provide updates where necessary. Also discussed are factors which must be considered in developing criteria for iodine control. For capture from gas streams, silver mordenite and a silver nitrate impregnated silica (AC-6120) are consid… more
Date: July 1, 1983
Creator: Burger, L.L. & Scheele, R.D.
Partner: UNT Libraries Government Documents Department
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Application of the carbon dioxide-barium hydroxide hydrate gas-solid reaction for the treatment of dilute carbon dioxide-bearing gas streams

Description: The removal of trace components from gas streams via irreversible gas-solid reactions in an area of interest to the chemical engineering profession. This research effort addresses the use of fixed beds of Ba(OH)/sub 2/ hydrate flakes for the removal of an acid gas, CO/sub 2/, from air that contains approx. 330 ppM/sub v/ CO/sub 2/. Areas of investigation encompassed: (1) an extensive literature review of Ba(OH)/sub 2/ hydrate chemistry, (2) microscale studies on 0.150-g samples to develop a bet… more
Date: September 1, 1983
Creator: Haag, G.L.
Partner: UNT Libraries Government Documents Department
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Carbon-14 immobilization via the Ba(OH)/sub 2/. 8H/sub 2/O process

Description: The airborne release of /sup 4/C from varous nuclear facilities has been identified as a potential biohazard due to the long half-life of /sup 14/C (5730 y) and the ease with which it may be assimilated into the biosphere. At ORNL, technology has been developed for the removal and immobilization of this radionuclide. Prior studies have indicated that /sup 14/C will likely exist in the oxidized form as CO/sub 2/ and will contribute slightly to the bulk CO/sub 2/ concentration of the gas stream, … more
Date: March 1, 1983
Creator: Haag, G.L.; Nehls, J.W. Jr. & Young, G.C.
Partner: UNT Libraries Government Documents Department
open access

Auger decay mechanism in photon-stimulated desorption of ions from surfaces

Description: Photon-stimulated desorption (PSD) of positive ions was studied with synchrotron radiation using an angle-integrating time-of-flight mass spectrometer. Ion yields as functions of photon energy near core levels were measured from condensed gases, alkali fluorides, and other alkali and alkaline earth halides. These results are compared to bulk photoabsorption measurements with emphasis on understanding fundamental desorption mechanisms. The applicability of the Auger decay mechanism, in which ion… more
Date: November 1, 1983
Creator: Parks, C.C.
Partner: UNT Libraries Government Documents Department
open access

Stability of tetravalent actinides in perovskites

Description: This paper reports the first determination of the enthalpy of formation of a complex actinide(IV) oxide: ..delta..H/sup 0//sub f/ (BaUO/sub 3/, s, 298 K) = -1690 +- 10 kJ mol/sup -1/. The preparation and properties of this and other actinide(IV) complex oxides are described and are compared with other perovskites BaMO/sub 3/. The relative stabilities of tetravalent and hexavalent uranium in various environments are compared in terms of the oxidation-reduction behavior of uranium in geological n… more
Date: January 1, 1983
Creator: Williams, C. W.; Morss, L. R. & Choi, I. K.
Partner: UNT Libraries Government Documents Department
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