Influence of Organic Cosolvents on the Sorption Kinetics of Hydrophobic Organic Chemicals

Mark L. Brusseau, A. Lynn Wood, P. Suresh, C. Rao

Research output: Contribution to journalArticle

96 Scopus citations

Abstract

A quantitative examination of the kinetics of sorption of hydrophobic organic chemicals by soils from mixed solvents reveals that the reverse sorption rate constant (k2) increases log-linearly with increasing volume fraction of organic cosolvent (fc). This relationship was expected, based on the existence of a log-log inverse relationship between k2and the equilibrium sorption constant (Kp), and a log-linear inverse relationship between Kpand fc. These results are interpreted in terms of a conceptual model wherein sorption kinetics is controlled by diffusion of sorbate within the matrix of sorbent organic matter. Decreased polarity of the mixed solvent, caused by the addition of a cosolvent, appears to influence the conformation of the polymeric organic matter and, hence, the rate of sorbate diffusion.

Original languageEnglish (US)
Pages (from-to)903-910
Number of pages8
JournalEnvironmental Science and Technology
Volume25
Issue number5
DOIs
StatePublished - May 1 1991

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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