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SORPTION OF 2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN FROM WATER BY SURFACE SOILS
Citation:
Walters, R. W., S. A. Ostazeski, AND A. GuiseppiElie. SORPTION OF 2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN FROM WATER BY SURFACE SOILS. ENVIRONMENTAL SCIENCE & TECHNOLOGY 23(4):480-484, (1989).
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Description:
The sorption of l4C-labeled 2,3,7,8-tetrachlorodibenzo- p-dioxin (TCDD) from water by two uncontaminated surface soils from the Times Beach, MO, area was evalu- ated by using batch shake testing. Sorption isotherm plots for the soil with the lower fraction organic carbon (f,) 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 KO, of 6.66, where KO, is the partition coefficient normalized on the basis of soil organic carbon content. Significant interferences attrib- uted to the presence of nonseparable suspended particles (NSP) were apparent in the measurement of the water- phase concentrations of TCDD for experiments involving the high-f,, soil. Prewashing this soil from one to five consecutive times with water appeared to reduce these interferences, as individual-point distribution ratios ap- proached the K, value determined for the low-f, soil. The measured value of log K, agrees with the reported estimate of log K, of 6.6 for TCDD made by applying the cosolvent theory to isotherm data generated with water/methanol mixtures.
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SORPTION OF 2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN FROM WATER BY SURFACE SOILS
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