Accession Number:

ADA346518

Title:

Organic Pollutants in Soils, as Studied by Nuclear Magnetic Resonance

Descriptive Note:

Final rept. 1 Mar 95-28 Feb 98

Corporate Author:

COLORADO STATE UNIV FORT COLLINS DEPT OF CHEMISTRY

Personal Author(s):

Report Date:

1998-05-15

Pagination or Media Count:

39.0

Abstract:

This three-year project focussed on the development and application of state-of-the art NMR nuclear magnetic resonance techniques to elucidate the fundamental behaviors of certain organic pollutants e.g., benzene, CCl, trichloroethylene, ethylene glycol when adsorbed in typical soils, as represented in most of this study by the following major soil components humics humic acid, fulvic acid, humin, clays montmorillonite, kaolinite and silica. The first stage was the isolation separation and detailed C-13 NMR characterization of the humic materials from a soil of southwestern Colorado this work is resulting in the most detailed chemical-structural elucidation ever carried out on such a three-component humic suite. C-13 NMR studies revealed a spectacular case of co-contamination in reactions between CCl4 and benzene adsorbed in montmorillonite clays, yielding such Friedel-Crafts products as benzophenone, benzoic acid and C6H53C the last being analogous to the product in a ship-in-a-bottle reaction between the two initial components in HY zeolite. C-13 NMR also elucidated the photo-assisted decomposition of trichloroethylene absorbed on soil components forming Cl2CHCO2H, Cl3CCO2H, Cl3CCHCl2 etc., a much slower analog of the well-known conversions employing TiO2s as the adsorbent. H-2 NMR lineshape studies elucidated the detailed local motions of benzene, trichloroethylene and ethylene glycol adsorbed on major soil components.

Subject Categories:

  • Organic Chemistry
  • Soil Mechanics
  • Atomic and Molecular Physics and Spectroscopy
  • Solid Wastes and Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE