Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Colloidal FE2O3 Transport Studies in Laboratory Model Systems Using Shallow Aquifer Material.
Author Puls, R. W. ; Powell, R. M. ;
CORP Author Robert S. Kerr Environmental Research Lab., Ada, OK. ;NSI Technology Services Corp., Ada, OK.
Publisher 1991
Year Published 1991
Report Number EPA/600/D-91/098;
Stock Number PB91-191114
Additional Subjects Iron oxides ; Aquifer systems ; Environmental transport ; Colloids ; Water pollution ; Adsorption ; Porous media ; Experimental design ; Tracer studies ; Isotopic labeling ; Statistical analysis ; Flow rate ; pH ; Electrolytes ; Particle size ; Reprints ; Globe(Arizona)
Library Call Number Additional Info Location Last
NTIS  PB91-191114 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 09/04/1991
Collation 5p
The stability and transport of radio-labeled Fe2O3 colloids were studied using laboratory batch and column techniques. Core 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. PCS and scanning electron microscopy (SEM) were used to verify the size of the colloids and their stability. Variables in the study included flow rate, pH, ionic strength, electrolyte composition (anion/cation), colloid concentration, and colloid size. Transport 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. The rate of colloid transport was over 21 times that of the dissolved arsenate. Extent 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.