title: Partitioning of dissolved chlorinated ethenes into vegetable oil.
abstract: Food-grade soybean oil (SoyOil) has been used to enhance in situ anaerobic bioremediation at sites contaminated with chlorinated ethenes (CEs). The abiotic interactions of SoyOil with the CEs may be significant and need to be better understood. The oil: water partition coefficients (Kp) of dissolved CEs into SoyOil were measured in batch tests and ranged from 22 to 1200 with increasing chlorination. CE mixtures significantly reduced the Kp for tetrachloroethene (PCE), but not the other CEs. Simple flow tests were used to quantify the mass transfer coefficients (kL) of dissolved CEs into SoyOil. Higher kL values corresponded to the CEs with higher diffusivity in water. CE mixtures reduced the kL for all of the CEs. The results can be used to predict abiotic interactions and distribution of contaminant mass expected after SoyOil injection, and thus provide a more accurate estimate of the mass of CEs removed due to enhanced biodegradation.
authors.affiliation: U.S. EPA, 999 18th Street, Suite300, Denver, CO 80202, USA.
authors.forename: Patricia
authors.initials: P
authors.lastname: Pfeiffer
authors.forename: Angela R
authors.initials: AR
authors.lastname: Bielefeldt
authors.forename: Tissa
authors.initials: T
authors.lastname: Illangasekare
authors.forename: Bruce
authors.initials: B
authors.lastname: Henry
mesh_terms: D000042:Absorption; D001673:Biodegradation, Environmental; D004058:Diffusion; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry*; D013024:Soybean Oil / Q000737:chemistry*; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods
chemical_list: D006843:Hydrocarbons, Chlorinated; D014874:Water Pollutants, Chemical; D013024:Soybean Oil