Vibrational and NMR probe studies of S Az-1 montmorillonite
- Florida Univ., Gainesville, FL (United States). Dept. of Soil Science
- Los Alamos National Lab., NM (United States)
This paper reports a study of the interactions of exchangeable metal cations with mineral surfaces using a combined spectroscopic/macroscopic approach. Objectives were to examine the use of water molecules and metal cations as molecular probes of smectite water interactions. The {nu}{sub 2} mode of water is used as a diagnostic vibrational band. An FTIR-gravimetric cell is used to examine the FTIR spectra of water on homoionic smectites. The {sup 23}Na NMR resonance is used to probe metal-water interactions on the surface. Results show that there are strong changes in both position and absorption coefficient of the H-O-H bending mode of water sorbed on SAz-1 montmorillonite as a function of water content. These changes are attributed to strong electrostatic forces and mobility changes that occur when the water in the interlammelar space is associated with the metal ion. The clay surface is viewed as having at least two distinct sites to which a hydrated Na{sup +} can bind. 32 refs, 5 figs. (DLC)
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10170428
- Report Number(s):
- LA-UR-92-2075; CONF-9105366-1; ON: DE92017443
- Resource Relation:
- Conference: Workshop on metal speciation and contamination of soil,Jekyll Island, GA (United States),May 1991; Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
MONTMORILLONITE
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
HYDRATION
WATER
SODIUM IONS
FOURIER TRANSFORM SPECTROMETERS
INFRARED SPECTRA
DEHYDRATION
SODIUM 23
NUCLEAR MAGNETIC RESONANCE
SMECTITE
360602
400201
665100
STRUCTURE AND PHASE STUDIES
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
NUCLEAR TECHNIQUES IN CONDENSED MATTER PHYSICS