||The swelling properties of soil organic matter and their relation to sorption of non-ionic organic compounds /
Lyon, William G. ;
Rhodes, D. E.
||ManTech Environmental Technology, Inc., Ada, OK.;Robert S. Kerr Environmental Research Lab., Ada, OK.
|| Robert S. Kerr Environmental Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency ; National Technical Information Service,
Swelling soils. ;
Soil absorption and adsorption. ;
Organic water pollutants.
Humic acids ;
Soil chemistry ;
Organic soils ;
Ground water ;
Organic solvents ;
Soil organic matter
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||viii, 129 pages : illustrations ; 28 cm
A method has been developed to measure the swelling properties of concentrated natural organic materials in various organic liquids, and has been applied to various peat, pollen, chitin and cellulose samples. The swelling of these macromolecular materials is the volumetric manifestation of bulk sorption, i.e., sorption by dissolution (or partitioning) of the sorbed liquids into the macromolecular solid phase. Direct evidence for the existence of the category of sorbed materials has been obtained for soil organic materials by the present research; swelling in liquids has long been known in coals and polymers. Bulk sorbed molecules are thought to be inaccessible to direct biological attack, and may represent a continuing source of low-level rebound contamination of groundwater at a polluted site. Equilibration of bulk-sorbed molecules with liquid phases surrounding the particles is kinetically slow (diffusion limited) relative to sorption and fluid movement, and this sluggishness is probably responsible for some nonequilibrium sorption phenomena seen in soil column flow experiments. Molecules with molar volumes greater than about 93 cc/mole appear to be strongly excluded from sorption inside the soil organic materials studied in the work. In contrast, cellulose excluded molecules with molar volumes greater than about 88 cc/mole. Extensive bibliographies included.
Cover title. "July 1991." "EPA/600/2-91/033." "EPA contract no 68-C8-0025." PB91-217406. Includes bibliographical references. "Roger L. Cosby, project officer." Microfiche.