Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Chemical Transport Facilitated by Colloidal-Sized Organic Molecules.
Author Enfield, C. G. ;
CORP Author Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/395;
Stock Number PB91-171512
Additional Subjects Transport theory ; Soils ; Colloids ; Hexachlorobenzene ; Blue Dextran ; Micelles ; Mathematical models ; Contaminants ; Porosity ; Ground water ; Organic compounds ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB91-171512 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 09/04/1991
Collation 4p
The fluid passing through the pores of soils and geologic materials is not just water with dissolved inorganic chemicals, but a complex mixture of organic and inorganic molecules. Large organic molecules such as humic and fulvic materials may impact the movement of contaminants. If the large organic molecules are mobile and they act like surfactant micelles, they can facilitate the movement of hydrophobic organic contaminants. Enfield and Bengtsson performed a sensitivity analysis evaluating the importance of several processes that might impact the movement of hydrophobic organic chemicals. The sensitivity shown in the analysis demonstrates the importance of a knowledge of the mobility of the organic colloids and the ability of the organic colloids to partition a contaminant and facilitate its movement as well as the amount of organic colloid present. The analysis indicates that if the colloid is not mobile it will not have an impact on chemical transport and also shows the importance of the amount of mobile carbon assuming the partition coefficient was the same for all carbon (mobile and associated with the mineral fraction of the soil). Experimental evidence of facilitated transport for hexachlorobenzene due to the presence of a polysaccharide (blue dextran) is also discussed.