Nonequilibrium transport of organic chemicals: The impact of pore-water velocity

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The impact of variations in pore-water velocity on the nonequilibrium sorption and transport of organic chemicals was investigated. Miscible displacement experiments were performed with four organic chemicals (dichlorobenzene, naphthalene, tetrachloroethene and p-xylene) and three aquifer materials having low organic-carbon contents (0.02-0.1%). The results of the experiments were analyzed by using a one-dimensional advective-dispersive transport model, wherein sorption is considered instantaneous for a fraction of the sorbent and rate-limited for the remainder. An inverse relationship between the reverse sorption rate constant and the equilibrium sorption constant was evident for each of two velocities. However, there was an order-of-magnitude difference between the rate constants obtained at the two velocities. This suggests the existence of a time-scale effect, which must be accounted for when modeling the transport of organic solutes.

Original languageEnglish (US)
Pages (from-to)353-368
Number of pages16
JournalJournal of Contaminant Hydrology
Issue number4
StatePublished - Apr 1992

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology


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