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Author Murphy, E. M. ♦ Zachara, J. M.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ENVIRONMENTAL SCIENCES ♦ GEOSCIENCES ♦ ORGANIC COMPOUNDS ♦ SORPTION ♦ ANTHRACENE ♦ ENVIRONMENTAL TRANSPORT ♦ HEMATITE ♦ HUMIC ACIDS ♦ KAOLINITE ♦ ALUMINIUM COMPOUNDS ♦ ALUMINIUM SILICATES ♦ AROMATICS ♦ CHALCOGENIDES ♦ CONDENSED AROMATICS ♦ HYDROCARBONS ♦ IRON COMPOUNDS ♦ IRON ORES ♦ IRON OXIDES ♦ MASS TRANSFER ♦ MINERALS ♦ ORES ♦ ORGANIC ACIDS ♦ OXIDE MINERALS ♦ OXIDES ♦ OXYGEN COMPOUNDS ♦ SILICATE MINERALS ♦ SILICATES ♦ SILICON COMPOUNDS ♦ TRANSITION ELEMENT COMPOUNDS ♦ Environment, Terrestrial- Chemicals Monitoring & Transport- (1990-) ♦ Geosciences
Abstract The sorption of three hydrophobic organic compounds (HOC) was investigated on hematite and kaolinite that had been coated with natural humic substances over a mass percent carbon range of 0.01-0.5%. Increasing quantities of sorbed humic substances increased the sorption of HOC. Anthracene, the most hydrophobic HOC, showed the greatest sorption enhancement, while the most aromatic coating, peat humic acid, was the strongest sorbent. Depending on the type of humic acid coating and the mineral substrate, the experimental K{sub oc} values were either higher or lower than those predicted by the K{sub ow}. The sorptivity of a given humic acid for HOC was not the same on kaolinite and hematite, suggesting that the orientation and structure of the humic substance on the mineral may affect the surface area of the organic phase and the accessibility of hydrophobic domains that control HOC sorptivity. Sorption isotherms for HOC on the humic-coated mineral substrates were nonlinear, implying that the sorption phenomenon was adsorption onto rather than partitioning into the surface organic phase.
ISSN 0013936X
Educational Use Research
Learning Resource Type Article
Publisher Date 1990-10-01
Publisher Place United States
Journal Environmental Science and Technology
Volume Number 24
Issue Number 10


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