Record Display for the EPA National Library Catalog


Main Title Stability and Transport of Inorganic Colloids through Contaminated Aquifer Material.
Author Puls, R. W. ; Powell, R. M. ; Rees, T. F. ;
CORP Author Robert S. Kerr Environmental Research Lab., Ada, OK. ;ManTech Environmental Technology, Inc., Ada, OK. ;Geological Survey, San Diego, CA.
Publisher 1991
Year Published 1991
Report Number EPA/600/A-92/068;
Stock Number PB92-164839
Additional Subjects Colloids ; Water pollution ; Environmental transport ; Aquifer systems ; Inorganic compounds ; Experimental design ; Ground water ; pH ; Electrolytes ; Ionic mobility ; Porous media ; Isotopic labeling ; Tracer studies ; Iron oxides ; Arsenates ; Chemical composition ; Reprints ; Globe(Arizona)
Library Call Number Additional Info Location Last
NTIS  PB92-164839 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 6p
Laboratory columns using contaminated natural aquifer material from Globe, Arizona, were used to investigate the transport of inorganic colloids under saturated flow conditions. Fe2O3 radio-labeled spherical colloids of various diameters were synthesized and introduced into the columns under varying conditions of pH, ionic strength, electrolyte composition, and colloid concentration. Column influent and effluent were evaluated by photon correlation spectroscopy and scintillation-counting techniques. Effluent breakthrough concentrations of the colloid were as high as 57 percent of the influent concentration under conditions. In all cases where significant transport occurred, the colloids arrived at approximately the same time as a conservative tracer, tritium. Conditions favoring colloidal transport in the system were low ionic strength and a pH in the range where the colloids are stable. Arsenate was used as a model reactive contaminant to evaluate its facilitated transport on the Fe2O3 colloids. The calculated sorption capacity of the colloids from batch tests was 1 percent by weight for arsenate. Compared to dissolved arsenate transport in the same columns, the colloids were transported more than 21 times faster.