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Sorption of Pyridine to Suspended Soil Particles Studied by Deuterium Nuclear Magnetic Resonance

^a Dep. of Geology and Geophysics, Texas A&M Univ., College Station, TX 77843
^b Dep. of Agricultural & 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 (21K): [in a new window]   Fig. 1. (a) Spin-lattice relaxation times (T1) of , ß, and deuterium of d5–pyridine in water as a function of pH. (b) T1 of deuterium of d5–pyridine in water, 0.001 M benzoic acid (C6H5COOH) and 0.001 M phenol (C6H5OH) solutions as a function of pH, and modeled T1 in water. For both (a) and (b), the measurement error is generally <1% and approximately the same size as the symbols used).

View larger version (18K): [in a new window]   Fig. 2. Measured chemical shifts () of ß deuterium of d5–pyridine in water, 0.001 M benzoic acid (C6H5COOH) and 0.001 M phenol (C6H5OH) aqueous solutions as a function of pH, and modeled in water.

View larger version (17K): [in a new window]   Fig. 3. Spin-spin relaxation times (T2) of deuterium of d5–pyridine in aqueous suspensions of untreated and NaOH-treated water-dispersible clays (WDCs) as a function of pH. Values at pH 6 and 7 were calculated from the measured half linewidth, 1/2, with no associated errors reported.

View larger version (11K): [in a new window]   Fig. 4. 2H nuclear magnetic resonance (NMR) spectra of d5–pyridine and deuterated water at natural abundance (the most upfield-shifted peak) in aqueous suspensions of untreated and NaOH-treated WDCs at different pH values. (a) untreated at pH 4 (, ß, and water). (b) untreated at pH 6 (unresolved , ß, and water). (c) untreated at pH 7 (unresolved , ß, and water). (d) untreated at pH 9 (, , ß, and water). (e) treated at pH 4 (, ß, and water). (f) treated at pH 6 (, ß, and water). (g) treated at pH 7 (, ß, and water). (h) treated at pH 9 (, , ß, and water).

View larger version (16K): [in a new window]   Fig. 5. Measured chemical shifts () of ß deuterium of d5–pyridine in aqueous suspensions of untreated, NaOH-treated, H2O2–treated, and H2O2 + NaOH-treated WDCs, and the standard clay as a function of pH. Data for background solution (0.01 M NaCl) is shown for comparison.