Nonequilibrium Sorption and Transport of Neutral and Ionized Chlorophenols

Linda S. Lee, P. Suresh, C. Rao, Mark L. Brusseau

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Abstract

For a series of chlorophenols sorption nonequilibrium was assessed by fitting a bicontinuum sorption model to breakthrough curves measured by miscible displacement techniques. A single log-log inverse relationship was observed between the desorption rate coefficient (k2, h-1) and the equilibrium sorption constant (Kp, mL/g) for all chlorophenols as well as for a series of chlorobenzenes. This suggests that approach to sorption equilibrium for neutral and ionized chlorophenols is constrained in a manner similar to that for nonpolar hydrophobic organic chemicals. For neutral pentachlorophenol (PCP), Kp values decreased log-linearly with increasing volume fraction methanol (fc), with successful extrapolation of these data to aqueous systems. A log-linear relationship was observed between k2 and fc in good agreement with independent estimates. For a series of ionized chlorophenols, the fraction of instantaneous sorption domains (F) increased with increasing solute hydrophobicity, while F decreased with increasing fc for neutral PCP.

Original languageEnglish (US)
Pages (from-to)722-729
Number of pages8
JournalEnvironmental Science and Technology
Volume25
Issue number4
DOIs
StatePublished - Apr 1 1991
Externally publishedYes

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ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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