Cooperative sorption of organic chemicals in systems composed of low organic carbon aquifer materials

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Abstract

The effect of a nonionic, low-polarity cosolute (tetrachloroethene) on the sorption of three nonionic, low-polarity organic chemicals (naphthalene, p-xylene, 1,4-dichlorobenzene) by two aquifer materials with low organic carbon contents (<0.03%) was investigated. The results of miscible-displacement experiments performed with single- and binary-solute solutions were compared to elucidate the occurrence of antagonistic or synergistic interactions. In all cases, the sorption of the primary solute was enhanced by the presence of tetrachloroethene. Equilibrium sorption constants measured in binary-solute systems were 1.5-3 times larger than those measured for the single-solute systems. Hence, tetrachloroethene had a synergistic (i.e., cooperative), rather than an antagonistic (i.e., competitive), effect on the sorption of the primary solutes. The enhanced sorption was postulated to result from sorbed tetrachloroethene increasing the effective organic carbon content of the sorbent.

Original languageEnglish (US)
Pages (from-to)1747-1752
Number of pages6
JournalEnvironmental Science and Technology
Volume25
Issue number10
StatePublished - 1991

Fingerprint

Organic Chemicals
Tetrachloroethylene
Organic chemicals
Organic carbon
Aquifers
tetrachloroethylene
Sorption
solute
sorption
organic carbon
aquifer
xylene
Xylene
Naphthalene
Sorbents
naphthalene
chemical
material
experiment
Experiments

ASJC Scopus subject areas

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

Cite this

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title = "Cooperative sorption of organic chemicals in systems composed of low organic carbon aquifer materials",
abstract = "The effect of a nonionic, low-polarity cosolute (tetrachloroethene) on the sorption of three nonionic, low-polarity organic chemicals (naphthalene, p-xylene, 1,4-dichlorobenzene) by two aquifer materials with low organic carbon contents (<0.03{\%}) was investigated. The results of miscible-displacement experiments performed with single- and binary-solute solutions were compared to elucidate the occurrence of antagonistic or synergistic interactions. In all cases, the sorption of the primary solute was enhanced by the presence of tetrachloroethene. Equilibrium sorption constants measured in binary-solute systems were 1.5-3 times larger than those measured for the single-solute systems. Hence, tetrachloroethene had a synergistic (i.e., cooperative), rather than an antagonistic (i.e., competitive), effect on the sorption of the primary solutes. The enhanced sorption was postulated to result from sorbed tetrachloroethene increasing the effective organic carbon content of the sorbent.",
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AU - Brusseau, Mark L

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N2 - The effect of a nonionic, low-polarity cosolute (tetrachloroethene) on the sorption of three nonionic, low-polarity organic chemicals (naphthalene, p-xylene, 1,4-dichlorobenzene) by two aquifer materials with low organic carbon contents (<0.03%) was investigated. The results of miscible-displacement experiments performed with single- and binary-solute solutions were compared to elucidate the occurrence of antagonistic or synergistic interactions. In all cases, the sorption of the primary solute was enhanced by the presence of tetrachloroethene. Equilibrium sorption constants measured in binary-solute systems were 1.5-3 times larger than those measured for the single-solute systems. Hence, tetrachloroethene had a synergistic (i.e., cooperative), rather than an antagonistic (i.e., competitive), effect on the sorption of the primary solutes. The enhanced sorption was postulated to result from sorbed tetrachloroethene increasing the effective organic carbon content of the sorbent.

AB - The effect of a nonionic, low-polarity cosolute (tetrachloroethene) on the sorption of three nonionic, low-polarity organic chemicals (naphthalene, p-xylene, 1,4-dichlorobenzene) by two aquifer materials with low organic carbon contents (<0.03%) was investigated. The results of miscible-displacement experiments performed with single- and binary-solute solutions were compared to elucidate the occurrence of antagonistic or synergistic interactions. In all cases, the sorption of the primary solute was enhanced by the presence of tetrachloroethene. Equilibrium sorption constants measured in binary-solute systems were 1.5-3 times larger than those measured for the single-solute systems. Hence, tetrachloroethene had a synergistic (i.e., cooperative), rather than an antagonistic (i.e., competitive), effect on the sorption of the primary solutes. The enhanced sorption was postulated to result from sorbed tetrachloroethene increasing the effective organic carbon content of the sorbent.

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