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TRANSPORT OF INORGANIC COLLOIDS THROUGH NATURAL AQUIFER MATERIAL: IMPLICATIONS FOR CONTAMINANT TRANSPORT
Citation:
Puls, R. AND R. Powell. TRANSPORT OF INORGANIC COLLOIDS THROUGH NATURAL AQUIFER MATERIAL: IMPLICATIONS FOR CONTAMINANT TRANSPORT. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-92/113 (NTIS PB92158690).
Description:
The stability and transport of radiolabeled Fe2O3 particles were studied using laboratory batch and column techniques. ore material collected from a shallow sand and gravel aquifer was used as the immobile column matrix material. ariables in the study included flow rate, pH, ionic strength, electrolyte composition, particle concentration, and particle size. ransport was highly dependent upon colloidal stability. ron oxide colloids were not only mobile to a significant extent, but under some hydro-geochemical conditions were transported faster than tritiated water, a conservative tracer. he extent of colloid breakthrough was dependent upon a variety of parameters; however, the highest statistical correlation was observed with particle size and anionic composition of the supporting electrolyte. rsenate was utilized for assessment of colloid-contaminant and contaminant-aquifer interactions and comparison of dissolved and colloidally associated transport in dynamic model systems. he rate of colloid-associated arsenate transport was over 21 times that of the dissolved arsenate.