Local motions of organic pollutants in soil components, as studied by H-2 NMR

H-2 NMR spectra and interpretations are presented on a series of samples, e ach consisting of a deuterium-labeled organic pollutant (trichloroethylene, acetone, pyridine; benzene, or ethylene glycol) adsorbed on a soil compone nt (montmorillonite clay or humic acid). Spectra were obtained over a wide temperature range and using two values of the quadrupolar echo delay period . Computer simulations of line shapes resulting from various forms of local motion of C-H-2 moieties provide useful guidelines for interpreting the ex perimental results. In a few cases, detailed line shape simulations are giv en. This approach is attractive for elucidation of the detailed motional be haviors of organic pollutants adsorbed in soil.