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Sorption of low‐polarity organic compounds on oxide minerals and aquifer material
Author(s) -
Stauffer Thomas B.,
Macintyre William G.
Publication year - 1986
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620051103
Subject(s) - sorption , chemistry , aquifer , environmental chemistry , naphthalene , goethite , soil water , trichloroethylene , inorganic chemistry , total organic carbon , hydrocarbon , groundwater , organic chemistry , adsorption , geology , soil science , geotechnical engineering
Abstract Sorption plays a significant role in the transport of low‐polarity organic compounds by ground water. Most contaminant movement is through saturated aquifers of low organic carbon content. Sorption processes on these materials may be different from those on high‐organic surface soils. Batch sorption isotherms using 14 C‐labeled compounds were determined on mineral oxides and aquifer materials; the sorbents used were Al 2 O 3 , Al(OH) 3 , FeO(OH) (goethite) and aquifer material. A surface soil sorbate was used for comparison with the sorption of the low‐carbon materials; the sorbates used were 1‐methylnaphthalene, naphthalene, trichloroethylene and o ‐dichlorobenzene. The acidity and ionic strength were varied to simulate different ground water conditions. The order of sorption coefficients for all sorbents was 1‐methylnaphthalene > naphthalene > o ‐dichlorobenzene > trichloroethylene. In general, sorption of each compound was strongest for the surface soil and decreased in the order of surface soil >> FeO(OH) > aquifer material > aluminum oxides. Under basic conditions, the sorption coefficients were significantly reduced in all cases. Sorption increased slightly at high ionic strengths.