title: Influence of water on the supercritical fluid extraction of naphthalene from soil.
abstract: Supercritical fluid extraction (SFE) is an innovative soil remediation technology. To aid system evaluation and design, thermodynamic and kinetic parameters have been measured using a naphthalene contaminated, loamy sand at various water contents. The experimental results show that supercritical carbon dioxide can easily extract naphthalene from soil when the water content is below 10%. At low water contents, mass transfer is rapid and the equilibrium partition coefficient is independent of the soil's water content. However, the overall mass transfer coefficient, (kova), decreases by at least a factor of 200 as the water content increases from 10 to 20%.
authors.affiliation: School of Engineering, University of Guelph, Guelph, Canada.
authors.forename: T J
authors.initials: TJ
authors.lastname: Smyth
authors.forename: R G
authors.initials: RG
authors.lastname: Zytner
authors.forename: W H
authors.initials: WH
authors.lastname: Stiver
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D003666:Decontamination / Q000379:methods*; D006801:Humans; D009281:Naphthalenes / Q000032:analysis / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
chemical_list: D009281:Naphthalenes; D012989:Soil Pollutants; D014867:Water; D002245:Carbon Dioxide; C031721:naphthalene