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TRANSPORT OF MACROMOLECULES AND HUMATE COLLOIDS THROUGH A SAND AND A CLAY AMENDED SAND LABORATORY COLUMN
Citation:
West, C. TRANSPORT OF MACROMOLECULES AND HUMATE COLLOIDS THROUGH A SAND AND A CLAY AMENDED SAND LABORATORY COLUMN. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/2-90/020 (NTIS PB90219205), 1990.
Description:
Laboratory experiments were conducted to determine if macromolecules or humate colloids would transport through sand columns and if they would exhibit any variations in their relative velocity based upon their molecular volumes and the pore size distribution of the column packing. oly(ethylene oxide) standards ranging in molecular weights from 50,400 to 900,000 were investigated. umate colloids were prepared from a humate muck as their calcium and sodium salts. olumns were packed with a fine-grained sand of uniform pore size (20 um in diameter) and the same sand amended with 8% clay (4% each kaolinite and illite) resulting in a pore size distribution in which=10% of the pores had diameters less than 2 um. he poly(ehtylene oxides) and calcium and sodium humate colloids were transported virtually conservatively through the Oil Creek sand, with no evidence of size exclusion phenomena. alcium humate was retarded in the amended sand due to complexation with the clay fraction but moved through the column with 77% recovery of the humate mass. he mobilization of clays was observed as a temporary increase in column effluent turbidity and a significant shift in the particle size distribution of the effluent (150 to 450 nm).
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TRANSPORT OF MACROMOLECULES AND HUMATE COLLOIDS THROUGH A SAND AND A CLAY AMENDED SAND LABORATORY COLUMN