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RECORD NUMBER: 24 OF 30

Main Title Sorption of 2,3,7,8-Tetrachlorodibenzo-p-Dioxin from Water by Surface Soils.
Author Walters, R. W. ; Ostazeski, S. A. ; Guiseppi-Elie, S. ;
CORP Author Maryland Univ., College Park. Dept. of Civil Engineering. ;Mobil Research and Development Corp., Princeton, NJ. Environmental Affairs and Toxicology Dept.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/099;
Stock Number PB90-117169
Additional Subjects Adsorption ; Water pollution ; Test methods ; Reprints ; Soil pollutants ; Tetrachlorodibenzodioxin
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NTIS  PB90-117169 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 7p
Abstract
The sorption of 14C-labeled 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) from water by two uncontaminated surface soils from the Times Beach, MO, area was evaluated by using batch shake testing. Sorption isotherm plots for the soil with the lower fraction organic carbon (foc) were linear, and regression analysis was used to determine a value of the sorption coefficient (KD) of 30400 mL/g. This value corresponds to a value of log Koc of 6.66, where Koc is the partition coefficient normalized on the basis of soil organic carbon content. Significant interferences attributed to the presence of nonseparable suspended particles were apparent in the measurement of the water-phase concentrations of TCDD for experiments involving the high-foc soil. Prewashing the soil from one to five consecutive times with water appeared to reduce these interferences, as individual-point distribution ratios approached the Koc value determined for the low-foc soil. The measured value of log Koc agrees with the reported estimate of log Koc 6.6 for TCDD made by applying the cosolvent theory to isotherm data generated with water/methanol mixtures. (Copyright (c) 1989 American Chemical Society.)