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MOLECULAR SIZE EXCLUSION BY SOIL ORGANIC MATERIALS ESTIMATED FROM THEIR SWELLING IN ORGANIC SOLVENTS
Citation:
Lyon, W. AND D. Rhodes. MOLECULAR SIZE EXCLUSION BY SOIL ORGANIC MATERIALS ESTIMATED FROM THEIR SWELLING IN ORGANIC SOLVENTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/352.
Description:
A published method previously developed to measure the swelling characteristics of powdered coal samples has been adapted for swelling measurements on various peat, pollen, chitin, and cellulose samples. he swelling of these macromolecular materials is the volumetric manifestation of absorption, that is, sorption by dissolution (or partitioning) of the sorbed liquids into cross-linked macromolecular solid phases. irect evidence for the existence of this additional category of sorbed materials has been obtained for soil organic materials by the present research; however, it seems to be limited by molecular size-exclusion effects to fairly small molecules. iquids with molar volumes greater than about 93 cm3 mol-1 appeared to be strongly excluded from sorption inside most cross-linked soil organic materials studied in this work. ellulose excluded liquids with molar volumes greater than about 88 cm3 mol-1.