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Author Hartzell, C. J. ♦ Yang, S. W. ♦ Parnell, R. A. ♦ Morris, D. E.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CHEMISTRY ♦ ENVIRONMENTAL SCIENCES ♦ RARE EARTH COMPOUNDS ♦ NMR SPECTRA ♦ ACTINIDE COMPLEXES ♦ TBP ♦ EUROPIUM COMPLEXES ♦ CHEMICAL SHIFT ♦ EXPERIMENTAL DATA ♦ NUMERICAL DATA ♦ EUROPIUM NITRATES ♦ CLAYS ♦ MONTMORILLONITE ♦ LAND POLLUTION CONTROL ♦ WATER POLLUTION CONTROL ♦ PUREX PROCESS
Abstract Application of {sup 31}P NMR to distinguish Eu(NO{sub 3}){sub 3}-complexed tributyl phosphate from uncomplexed tributyl phosphate (TBP) facilitates an understanding of the fate of these species in the clay hectorite. Solution {sup 31}P NMR studies show dramatic shifts of {minus}156.0 to {minus}172.9 ppm for Eu(NO{sub 3}){sub 3}6H{sub 2}O dissolved in TBP at TBP:Eu ratios 1:1 to 1:2.5. Pure TBP exhibits {sup 31}P chemical shift of {minus}0.3 ppm. Mixtures with higher TBP:Eu ratios display lines progressively downfield of {minus}156.0 ppm, reflecting exchange of complexed and free TBP. The Eu(NO{sub 3}){sub 3}-complexed TBP adsorbed into hectorite displays a {sup 31}P chemical shift of {minus}180.7 to {minus}193.8 ppm. Clays adsorbed with solutions that are 3.1, 5:1 and 7:1 TBP:Eu display peaks due to complex as well as peaks in the range {minus}4 to {minus}6 ppm attributed to uncomplexed TBP. No evidence of exchange is observed. Spectra of the TBP-adsorbed clay give a TBP line at {minus}0.7 ppm which changes slightly to {minus}-5.0 after exchange with Eu(NO{sub 3}){sub 3}. The Eu(NO{sub 3}){sub 3}-exchanged hectorite displays a line at {minus}17.6 ppm after adsorption of TBP. Neither of the latter two samples show indication of complex formation. The hectorite samples exposed to TBP or the complex display (001) d spacings of 17.9-18.4 A compared to 12.3-12.5 A for hectorite which has not been exposed to TBP. 26 refs., 5 figs., 3 tabs.
ISSN 00223654
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-03-23
Publisher Place United States
Journal Journal of Physical Chemistry
Volume Number 99
Issue Number 12


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