Adsorption of VOC vapors at the air-water interface in unsaturated media
AuthorEnright, Bryn Alison.
Volatile organic compounds -- Absorption and adsorption.
Zone of aeration.
Committee ChairConklin, Martha H.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractThe sorption of organic vapors to the air-water interface was studied using a wetted gas chromatograph column packed with a diatomaceous earth based media. Data were collected from 22 experiments on heptane, benzene, trichloroethene (TCE), perchioroethene (PCE), p-xylene and toluene at different moisture contents (lO%-30%). Sorption isotherms were constructed and air-water partitioning coefficients calculated. Results showed that sorption of the acyclics was primarily at the air-water interface and the aromatics were controlled by both adsorption at the interface and dissolution. These results also showed that solubility is not always a good indicator of the magnitude of the interface-air distribution coefficient as previous research suggests. The implication of this study is that adsorption to the air-water interface can be significant and must be quantified to accurately predict transport through the vadose zone.
Degree ProgramHydrology and Water Resources