Sorption of nonpolar organics on minerals and aquifer materials
The sorption of nonpolar organic chemicals on hydrous oxides, clay minerals, and subsurface aquifer materials was studied using the batch isotherm technique. Radiolabeled (/sup 14/C) trichloroethylene, orthodichlorobenzene, naphthalene, and 1-methylnaphthalene were sorbed on mineral sorbents, subsurface aquifers materials, and a surface soil at six different equilibrium concentrations over a concentration range from 0.001 mg/L to 1.0 mg/L. A knowledge of the sorption coefficients of these fuel components and solvents is necessary to predict the transport of these chemicals through ground water systems and ultimately to rivers, lakes, and estuaries. Sorption on oxides and surface soils was found to be pH-dependent with decreased sorption at high pH. Increased ionic strength showed a slight increase in sorption on surface soils and some oxides. Aquifer materials sorbed small amounts of (<3..mu..g/g) of the nonpolar organics. Sorption coefficients for two nonpolar sorbates were determined on seven different aquifer materials. K/sub oc/ varied by a factor of 10 over the aquifer material sorbents. Various sorbent chemical and physical properties, in addition to organic carbon, were measured to discover any correlations between the properties and sorption coefficients. No predictive relationship was found between the sorption coefficient and selected chemical/physical properties of the sorbents. Since the K/sub oc/ concept failed for the aquifer materials studied here and other predictive relations were not found, sorption coefficients must be determined for each aquifer material occurring at a contaminated site. These coefficients must be used in contaminant transport calculations.
- Research Organization:
- College of William and Mary, Williamsburg, VA (USA)
- OSTI ID:
- 6603409
- Country of Publication:
- United States
- Language:
- English
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59 BASIC BIOLOGICAL SCIENCES
AROMATICS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON 14
CARBON ISOTOPES
CHLORINATED ALIPHATIC HYDROCARBONS
CHLORINATED AROMATIC HYDROCARBONS
CLAYS
CONDENSED AROMATICS
EVEN-EVEN NUCLEI
GROUND WATER
HALOGENATED ALIPHATIC HYDROCARBONS
HALOGENATED AROMATIC HYDROCARBONS
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
ISOTOPE APPLICATIONS
ISOTOPES
LABELLED COMPOUNDS
LIGHT NUCLEI
MATERIALS
MONTMORILLONITE
NAPHTHALENE
NUCLEI
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
POLLUTION
RADIOISOTOPES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TRACER TECHNIQUES
WATER
WATER POLLUTION
YEARS LIVING RADIOISOTOPES