Desorption kinetics of volatile organic contaminants from aquifer materials

P. Grathwohl, J. Farrell, M. Reinhard

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Sorption and desorption of volatile, halogenated hydrocarbons from aquifer material are investigated using a frontal gas chromatography technique. One of the aquifer materials studied was silty sand with 0.15% organic C from the Santa Clara Valley, California; the other was a fine grained sand containing 0.02% organic C from Borden, Ontario. The time to recover 90% of the hydrocarbon was significantly higher for the water containing samples than for the dry solids despite the fact that the dry solids sorbed much more strongly. These findings suggest that mass transfer limitations are due to diffusion through the aqueous phase in the intraparticle domain, and that remediation of contaminated soil using soil air extraction techniques is typically operated under nonequilibrium conditions. Removal of the solid-bound contaminants is much slower than the concentration decrease in the mobile phase. -from Authors

Original languageEnglish (US)
Pages (from-to)343-350
Number of pages8
JournalUnknown Journal
StatePublished - Jan 1 1991
Externally publishedYes

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ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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