Influence of sorbate structure on nonequilibrium sorption of organic compounds

Mark L Brusseau, P. S C Rao

Research output: Contribution to journalArticle

115 Citations (Scopus)

Abstract

We investigate the relationship between sorbate structure and nonequilibrium sorption. The rate-limited sorption of compounds representing eight classes of organic chemicals, including chlorinated benzenes, unsubstituted and alkyl-substituted aromatics, chlorinated ethenes and ethanes, chlorinated phenols, nitrogen heterocycles, s-triazines, substituted amides, and substituted ureas, was examined by use of a single sorbent (sandy aquifer material) and the miscible displacement technique. The breakthrough curves were analyzed by using a bicontinuum model wherein sorption is assumed instantaneous for a fraction of the sorbent and rate limited for the remainder. Sorbate structure was shown to exert minimal impact on the nature of rate-limited sorption for nonionic, low-polarity compounds comprising relatively simple structures and for ionogenic compounds in neutral form. In contrast, sorbate structure appeared to have a significant impact for compounds comprising more complex structures (i.e., pesticides). First-order reverse rate constants determined for the pesticides were at least 1 order of magnitude smaller than those of the non-pesticides. This difference was attributed to differences in degree of constraint on diffusion within the polymeric structure of organic matter.

Original languageEnglish (US)
Pages (from-to)1501-1506
Number of pages6
JournalEnvironmental Science and Technology
Volume25
Issue number8
StatePublished - 1991

Fingerprint

Organic compounds
Sorption
organic compound
sorption
Pesticides
Sorbents
pesticide
Organic Chemicals
Triazines
Ethane
Phenols
triazine
Organic chemicals
ethane
breakthrough curve
Benzene
Aquifers
Amides
Urea
Biological materials

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Influence of sorbate structure on nonequilibrium sorption of organic compounds. / Brusseau, Mark L; Rao, P. S C.

In: Environmental Science and Technology, Vol. 25, No. 8, 1991, p. 1501-1506.

Research output: Contribution to journalArticle

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