Stability and transport of inorganic colloids through contaminated aquifer material
Technical Report
·
OSTI ID:5379830
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.
- Research Organization:
- Environmental Protection Agency, Ada, OK (United States). Robert S. Kerr Environmental Research Lab.
- OSTI ID:
- 5379830
- Report Number(s):
- PB-92-164839/XAB; EPA--600/A-92/068
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
AQUIFERS
ARIZONA
ARSENATES
ARSENIC COMPOUNDS
CHALCOGENIDES
CHEMICAL COMPOSITION
COLLOIDS
CONTAMINATION
DEVELOPED COUNTRIES
DISPERSIONS
ENVIRONMENTAL TRANSPORT
FEDERAL REGION IX
GROUND WATER
HYDROGEN COMPOUNDS
INORGANIC COMPOUNDS
IRON COMPOUNDS
IRON OXIDES
ISOTOPE APPLICATIONS
MASS TRANSFER
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
POLLUTION
STABILITY
TRACER TECHNIQUES
TRANSITION ELEMENT COMPOUNDS
TRITIUM COMPOUNDS
USA
WATER
WATER POLLUTION
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
AQUIFERS
ARIZONA
ARSENATES
ARSENIC COMPOUNDS
CHALCOGENIDES
CHEMICAL COMPOSITION
COLLOIDS
CONTAMINATION
DEVELOPED COUNTRIES
DISPERSIONS
ENVIRONMENTAL TRANSPORT
FEDERAL REGION IX
GROUND WATER
HYDROGEN COMPOUNDS
INORGANIC COMPOUNDS
IRON COMPOUNDS
IRON OXIDES
ISOTOPE APPLICATIONS
MASS TRANSFER
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
POLLUTION
STABILITY
TRACER TECHNIQUES
TRANSITION ELEMENT COMPOUNDS
TRITIUM COMPOUNDS
USA
WATER
WATER POLLUTION