The tributyl phosphate complex of Europium nitrate in hectorite: A P-NMR study

Conference · Fri Dec 01 04:00:00 EST 1995

OSTI ID:126522

Yang, S W; Hartzell, C J; Parnell, R A ^[1]

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1. 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

Related Subjects

54 ENVIRONMENTAL SCIENCES
ADSORPTION
CHEMICAL SHIFT
CLAYS
ENVIRONMENTAL TRANSPORT
EUROPIUM NITRATES
NUCLEAR MAGNETIC RESONANCE
PHOSPHORUS 31
RADIONUCLIDE MIGRATION
SORPTIVE PROPERTIES
TBP