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Molecular-Level Investigation of Monoaromatic Compound Sorption to Suspended Soil Particles by Deuterium Nuclear Magnetic Resonance

^a Dep. of Geology and Geophysics, Texas A&M Univ., College Station, TX 77843
^b Dep. of Agricultural and Biological Engineering, Clemson Univ., Clemson, SC 29634-0357, and Dep. of Environmental Toxicology and the Clemson Institute of Environmental Toxicology, Clemson Univ., Pendleton, SC 29670

View larger version (7K): [in a new window]   Fig. 1. The 2H nuclear magnetic resonance (NMR) spectra of different aromatic compounds and deuterated water at natural abundance in aqueous soil suspensions at pH 7. (a) d6–benzene (downfield-shifted). (b) d5–fluorobenzene (two peaks resolved for , the most downfield-shifted, and ß). (c) d8–toluene (one peak resolved for -C6D5 as the most downfield-shifted; -CD3 as the most upfield-shifted).

View larger version (24K): [in a new window]   Fig. 2. Spin–spin relaxation time (T2) values for d6–benzene (), the benzene ring (-C6D5) of d8–toluene (), and the deuterium of d5–fluorobenzene () in suspensions of the untreated soil fraction as a function of pH (1:200 soil to solution ratio, 0.01 M NaCl).

View larger version (25K): [in a new window]   Fig. 3. Spin–spin relaxation time (T2) values for d6–benzene and -C6D5 of d8–toluene in suspensions of the untreated soil fraction and the soil fraction treated with NaOH as a function of pH (1:200 soil to solution ratio, 0.01 M NaCl). d6–benzene for untreated soil; -C6D5 of d8–toluene for untreated soil; d6–benzene for treated soil; -C6D5 of d8–toluene for treated soil.

View larger version (24K): [in a new window]   Fig. 4. Spin–spin relaxation time (T2) values for the and ß deuterium of d5–fluorobenzene in suspensions of the untreated soil fraction and the soil fraction treated with NaOH as a function of pH (1:200 soil to solution ratio, 0.01 M NaCl). d5–fluorobenzene for untreated soil; ß d5–fluorobenzene for untreated soil; d5–fluorobenzene for treated soil; ß d5–fluorobenzene for treated soil.

View larger version (25K): [in a new window]   Fig. 5. Spin–spin relaxation time (T2) values for -CD3 of d8–toluene and d2–dichloromethane in suspensions of the untreated soil fraction and the soil fraction treated with NaOH as a function of pH (1:200 soil to solution ratio, 0.01 M NaCl). -CD3 of d8–toluene for untreated soil; d2–dichloromethane for untreated soil; -CD3 of d8–toluene for treated soil.