Development of a magnetic resonance sensor for on-line monitoring of {sup 99}Tc and {sup 23}Na in tank waste cleanup processes: Final report and implementation plan Page: 22 of 35
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15
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100as
C,,10
1
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500 1000
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Number of Averages
Fig. 8. Signal-to-noise ratio of pertechnetate resonance
acquired on two 99Tc standards as afunction of
number offree induction decay averages.
5.2 Technetium Redox Studies
Redox experiments were performed to verify that on-line oxidation
or reduction of pertechnetate could be performed and monitored with
the 2-T magnet system. These experiments were performed on a
0.005-M pertechnetate standard (derived from Tc metal in 1-M aqueous
nitric acid solution). The pertechnetate was reduced with aqueous
stannous chloride. When the reduction reactions were performed under
ambient conditions (i.e., 23"C), they appeared to be instantaneous. With
subsequent additions of reducting agent, the color progressed from a
clear yellow to a reddish-brown. Between subsequent additions, spectra
were acquired with minimal signal averaging (requiring ~2 min per
spectrum) on the 2-T magnet system (Fig. 9). The integrated peak
intensities from the pertechnetate resonance are plotted in Fig. 10.Ag 1
5.66': mM
-- ..... - - ......................... ----------------.....- --------- - - - ---- -----
0.55 mM
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Dieckman, S. L.; Jendrzejczyk, J. A. & Raptis, A. C. Development of a magnetic resonance sensor for on-line monitoring of {sup 99}Tc and {sup 23}Na in tank waste cleanup processes: Final report and implementation plan, report, February 24, 2000; Argonne, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc706190/m1/22/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.