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Nonlinear and Competitive Sorption of Apolar Compounds in Black Carbon-Free Natural Organic Materials

^a Department of Soil and Water, Connecticut Agricultural Experiment Station, 123 Huntington Street, P.O. Box 1106, New Haven, CT 06504-1106
^b Department of Civil and Environmental Engineering, Vanderbilt University, 400 24th Avenue South, VU Station B 351831, Nashville, TN 37235
^c Department of Environmental Sciences, Cook College, Rutgers University, New Brunswick, NJ 08901-8551
^d State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, The People's Republic of China
^e Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, MA 01003

View larger version (25K): [in a new window]   Fig. 1. Temperature-modulated differential scanning calorimetry traces of (a) Amherst soil humic acid and (b) Chelsea soil humic acid; T1 is thermal transition temperature 1; Cp is the change in specific heat capacity.

View larger version (14K): [in a new window]   Fig. 2. Isotherms of phenanthrene and naphthalene on Organosolve lignin (OS-lig).

View larger version (21K): [in a new window]   Fig. 3. Sorption of five different compounds by Chelsea humic acid (CSHA); DCB is dicholorobenzene and TCB is trichlorobenzene.

View larger version (14K): [in a new window]   Fig. 4. Phenanthrene sorption in compost humic acid (compost HA) and ultrafiltered Aldrich humic acid (AldHA).

View larger version (28K): [in a new window]   Fig. 5. Trend of increasing isotherm linearity (Freundlich exponent) with temperature for lignin, three humic acids, and a high-organic-content soil. The soil data are taken from Xing and Pignatello (1997).

View larger version (17K): [in a new window]   Fig. 6. Sorption of 1,2,4- trichlorobenzene (TCB) by Amherst humic acid (H-HA) and Amherst Al-flocculated humic acid (Al-HA) in the absence and presence of 1,3- dichlorobenzene (DCB) as the competing solute. Dashed lines represent Freundlich fits for the entire single-solute trichlorobenzene (TCB) isotherms, only part of which is shown in each case. Arrows indicate progressively increasing initial concentration of DCB (CDCB) from 0 to 25.8 mg/L in each series at constant total TCB mass present.