The tributyl phosphate complex of Europium nitrate in hectorite: A P-NMR study
- Northern Arizona Univ., Flagstaff, AZ (United States); and others
The behavior of organic complexes of actinides and lanthanides in clays must be understood to carry out effective environmental remediation. Eu(NO{sub 3}){sub 3}-complexed tributyl phosphate can be distinguished from uncomplexed tributyl phosphate (TBP) by {sup 31}P-NMR. The goal of this work is to gain an understanding of the fate of these species in the clay hectorite. The completed TBP adsorbed into hectorite displays a {sup 31}p-chemical shift of -180.7 to -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 -4 to -6 ppm attributed to uncompleted TBP. No evidence of exchange is observed. Spectra of the TBP-adsorbed clay give a TBP line at -0.7 ppm. The hectorite samples exposed to TBP or the complex display (001) d-spacings of 17.9 to 18.4 A compared to 12.3 to 12.5 A for hectorite which has not been exposed to TBP. Computer modeling was used to determine the percent of TBP-adsorbed hectorite in a sample prepared using a dilute TBP solution. The resulting clay contained 35% to 40% TBP-adsorbed hectorite.
- OSTI ID:
- 126522
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
Similar Records
A {sup 31}P-NMR relaxation study of tributyl phosphate in the clay hectorite
{sup 31}P NMR study of the complexation of TBP with lanthanides and actinides in solution and in a clay matrix