Sorption of 2,3,7,8-tetrachlorodibenzo-p-dioxin from water by surface soils
The sorption of {sup 14}C-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.
- Research Organization:
- Maryland Univ., College Park, MD (USA). Dept. of Civil Engineering
- OSTI ID:
- 5164410
- Report Number(s):
- PB-90-117169/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
540320 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ADSORPTION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON 14
CARBON ISOTOPES
CONTROL
DIOXIN
EVEN-EVEN NUCLEI
HETEROCYCLIC COMPOUNDS
ISOTOPE APPLICATIONS
ISOTOPES
LAND POLLUTION
LIGHT NUCLEI
NUCLEI
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
POLLUTANTS
POLLUTION
POLLUTION CONTROL
RADIOISOTOPES
SOILS
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TRACER TECHNIQUES
WATER POLLUTION CONTROL
YEARS LIVING RADIOISOTOPES