Sorption of polycyclic aromatic hydrocarbons by aquia aquifer materials
The sorption of three polycyclic aromatic hydrocarbons (PAHs) by Aquia Aquifer materials was investigated. Laboratory studies were conducted to generate equilibrium isotherm data using batch shake techniques. Six aquifer materials, with f[sub oc] values ranging from 0.0002 to 0.0089 were used. The influence of the solution phase conditions of pH, ionic strength, and cosolvent on sorption was investigated. Sorption isotherms could be described by the linear form of the Freundlich relationship. The sorption partition coefficients (K[sub d]) for sorption from aqueous solution were greater than predicted by an f[sub oc] basis alone. The K[sub d]s obtained for pyrene and phenanthrene were significantly related to f[sub oc] SA[sup [minus]1] (SA = specific surface area). This was not the case K[sub d] values obtained for naphthalene sorption. The solution phase conditions of pH and ionic strength were found to have a significant effect on the sorption of PAHs by aquifer materials. The effect of solution phase pH on the sorption of individual PAHs by aquifer materials was seen to be a concave up curve with a minimum about a pH of 7. The data obtained from ionic strength experiments indicated maximum sorption occurs at NaCl molar concentration of zero. The data is not well represented by a modified Setchenow relationship, but suggest that the sorptive capacity of the aquifer material may be modified by changes in the sorbent organic carbon. The isotherms generated for sorption of PAHs from methanol/water solution were found to be linear. The (K[sub d]) values were consistent with predictions made on the basis of sorbent f[sub oc] at low volume fractions of methanol. For all solutes and sorbents studied deviations from the predicted occurred as the volume fraction of methanol increased. These results suggest conformational changes in the sorbent f[sub oc] occur with varying solution phase conditions.
- Research Organization:
- Maryland Univ., College Park, MD (United States)
- OSTI ID:
- 5581469
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ADSORBENTS
MULTI-PARAMETER ANALYSIS
QUANTITATIVE CHEMICAL ANALYSIS
POLYCYCLIC AROMATIC HYDROCARBONS
SORPTION
AQUIFERS
CONFORMATIONAL CHANGES
ISOTHERMS
METHANOL
NAPHTHALENE
PHENANTHRENE
PYRENE
SPECIFIC SURFACE AREA
ALCOHOLS
AROMATICS
CHEMICAL ANALYSIS
CONDENSED AROMATICS
HYDROCARBONS
HYDROXY COMPOUNDS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)