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Effect of Aerobic and Anaerobic Conditions on Chlorophenol Sorption in Wetland Soils

^a Univ. of Kentucky, Soil & Water Biogeochemistry Lab., Dep. of Agronomy, N-122 Agricultural Science Building North, Lexington, KY 40546-0091
^b Univ. of Florida, Soil and Water Science Dep., 106 Newell Hall, P.O. Box 110510, Gainesville, FL 32611-0510

View larger version (14K): [in a new window]   Fig. 1. Effect of redox processes on pH changes in ten wetland soils. The H+ generated was determined from the sum of H+ produced from oxidation of NH+4, Fe2+, and H2S determined in the samples (Table 2), with oxygen as the electron acceptor.

View larger version (18K): [in a new window]   Fig. 2. Sorption isotherms for chlorophenols on Louisiana salt marsh soil (LSM) under aerobic and anaerobic conditions. Data conformed to linear models, and were used to compute linear distribution coefficients: (a) pentachlorophenol, (b) 2,3,4,5-tetrachlorophenol, (c) 3,4,5-trichlorophenol, (d) 3,5-dichlorophenol.

View larger version (18K): [in a new window]   Fig. 3. Dependency of organic C normalized distribution coefficients (Koc) on pH of ten aerobic and anaerobic wetland soils. (a) pentachlorophenol, (b) 2,3,4,5-tetrachlorophenol, (c) 3,4,5-trichlorphenol, and (d) 3,5-dichlorophenol. Arrows show the position of the pKa of the chlorophenols.

View larger version (16K): [in a new window]   Fig. 4. Dependency of organic C normalized distribution coefficients (Koc) on the octanol-water distribution coefficient of chlorophenols. The solid line is the least-squares fit of the data from this study. Data from other studies are provided for comparison. The Koc values for the neutral and ionic forms of chlorophenols in this study were determined by substituting appropriate pH values into equations in Fig. 3, and Kow values were obtained from the literature (see text for more details).