Cosolvent effects on sorption isotherm linearity

Bouchard, Dermont

doi:10.1016/s0169-7722(01)00213-3

Cited by 23 publications

(11 citation statements)

References 32 publications

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“…It is not clear if this deviation is caused by instabilities that developed despite the stable displacement (i.e., downward flush of cosolvent) or due to interactions between MeOH and the soil organic matter. In past studies, MeOH has been shown to impact the sorptive properties of natural organic matter (Bouchard, 2002). More work is need to understand how MeOH may be interacting with the organic phase in FMGP soils.…”

Section: Discussionmentioning

confidence: 99%

Cosolvent flushing for the remediation of PAHs from former manufactured gas plants

Birak

Newman

Richardson

et al. 2011

Journal of Contaminant Hydrology

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Cosolvent flushing is a technique that has been proposed for the removal of hydrophobic organic contaminants in the subsurface. Cosolvents have been shown to dramatically increase the solubility of such compounds compared to the aqueous solubility; however, limited data are available on the effectiveness of cosolvents for field-contaminated media. In this work, we examine cosolvent flushing for the removal of polycyclic aromatic hydrocarbons (PAHs) in soil from a former manufactured gas plant (FMGP). Batch studies confirmed that the relationship between the soil-cosolvent partitioning coefficient (Ki) and the volume fraction of cosolvent (fc) followed a standard log-linear equation. Using methanol at an fc of 0.95, column studies were conducted at varying length scales, ranging from 11.9 to 110 cm. Removal of PAH compounds was determined as a function of pore volumes (PVs) of cosolvent flushed. Despite using a high fc, rate and chromatographic effects were observed in all the columns. PAH effluent concentrations were modeled using a common two-site sorption model. Model fits were improved by using MeOH breakthrough curves to determine fitted dispersion coefficients. Fitted mass-transfer rates were two to three orders of magnitude lower than predicted values based on published data using artificially contaminated sands.

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Section: Discussionmentioning

confidence: 99%

Cosolvent flushing for the remediation of PAHs from former manufactured gas plants

Birak

Newman

Richardson

et al. 2011

Journal of Contaminant Hydrology

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“…Bouchard [16] suggested that linearity of sorption isotherm is related to the saturation of solution (C a /S c ), in which S c represented solubility of toxaphene in solution (mg/L) for this research. Results indicated that when the value of C a /S c was higher than 0.2, the linearity power was nearly 1 (Fig.…”

Section: Cosolvent Effect On Sorptionmentioning

confidence: 92%

“…Based on having the same initial concentration of toxaphene in solution, the linearity of sorption isotherm was noted to reduce with increase of cosolvent fraction. The nonlinearity of the toxaphene absorption to the Fe 0 surface in the presence of higher cosolvent fractions can be attributed to the decrease in marginal adsorption energy with increasing related surface concentration saturation [16].…”

Section: Cosolvent Effect On Sorptionmentioning

confidence: 99%

Modeling the effects of methanol on iron dechlorination of a complex chlorinated NAPL

Chen¹,

Clark²

2009

Journal of Hazardous Materials

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“…In natural ecosystems, the accurate prediction of the fate and transport of contaminants, particularly ionizable contaminants, necessitates a priori determination of the solubility of these contaminants (Bouchard, 2002). In these systems, quantifying mineral solubility (determining solubility product) is essential to determine the degree of solubilization and precipitation of a salt and to correct for its effect on the activity (and therefore the concentration) of ions in solutions and their potential release to ground or surface waters (Evangelou, 1998).…”

Section: Solubility and Solubility Productmentioning

confidence: 99%

Solution Properties of Inorganic Contamination in Mixed Solvents: Theory, Progress, and Limitations

Srour¹,

McDonald

2011

Critical Reviews in Environmental Science and Technology

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Most of what is known about the environmental fate and transport of contaminants comes from studies of dilute, aqueous solutions. Theoretical and practical aspects of hydrophobic organic contaminants in aqueous mixtures of organic solvents are well developed, but relatively little attention has been paid to those situations where inorganic contaminants such as metals, water, and organic solvents occur simultaneously. The authors discuss changes in solution properties accompanying the addition of organic solvents. They review more than 500 references to available data on ion solvation, solubility, activity, acidity, pairing, and pH in electrolyte and electrolyte-free solvent mixtures and tabulate selected experimental values. Whenever available, equations developed to estimate these properties are given and their applications and limitations described. The implications of the progress in mixed-solvents solution chemistry on contaminant behavior and transport are described. Major limitations to the study of inorganic contamination in mixed solvents include the absence of complete and comprehensive data (e.g., type of ionic species, activity coefficients, solubility constants) that characterize solute and solvent properties in these mixtures and the indefinite number of possible solute and solvent combinations. The generation of models predicting such data from easily measured benchmark solute and solvent properties is a major challenge. The availability of such database and models may open the field for environmental engineers and soil scientists to study the basic chemical processes and mechanisms of metal contamination in complex multicomponent systems.

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Cosolvent effects on sorption isotherm linearity

Cited by 23 publications

References 32 publications

Cosolvent flushing for the remediation of PAHs from former manufactured gas plants

Cosolvent flushing for the remediation of PAHs from former manufactured gas plants

Modeling the effects of methanol on iron dechlorination of a complex chlorinated NAPL

Solution Properties of Inorganic Contamination in Mixed Solvents: Theory, Progress, and Limitations

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