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COLLOIDAL FE2O3 TRANSPORT STUDIES IN LABORATORY MODEL SYSTEMS USING SHALLOW AQUIFER MATERIAL
Citation:
Puls, R. AND R. Powell. COLLOIDAL FE2O3 TRANSPORT STUDIES IN LABORATORY MODEL SYSTEMS USING SHALLOW AQUIFER MATERIAL. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/D-91/098 (NTIS PB91191114).
Description:
The stability and transport of radio-labeled Fe2O3 colloids were studied using laboratory batch and column techniques. ore material collected from a shallow sand and gravel aquifer near Globe, Arizona was used as the column matrix material. scintillation counting and laser light scattering with photon correlation spectroscopy (PCS) were used as means of colloid detection. CS and scanning electron microscopy (SEM) were used to verify the size of the colloids and their stability. ariables in the study included flow rate, pH, ionic strength, electrolyte composition (anion/cation), colloid concentration, and colloid size. ransport was highly dependant upon colloidal stability. Iron oxide colloids in the 100-900 nm particle diameter range were not only mobile to a significant extent, but under some hydrogeochemical conditions - were transported faster than a conservative tracer, tritium. he rate of colloid - transport was over 21 times that of the dissolved arsenate. xtent of breakthrough was dependant upon a complex variety of parameters, however the highest statistical correlation was observed with particle size and anionic composition of the supporting electrolyte.