Colloidal Fe sub 2 O sub 3 transport studies in laboratory model systems using shallow aquifer material
Technical Report
·
OSTI ID:5478592
The stability and transport of radiolabeled Fe{sub 2}O{sub 3} 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.
- Research Organization:
- Environmental Protection Agency, Ada, OK (United States). Robert S. Kerr Environmental Research Lab.
- OSTI ID:
- 5478592
- Report Number(s):
- PB-91-191114/XAB; EPA--600/D-91/098
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
540311* -- Environment
Aquatic-- Basic Studies-- Radiometric Techniques-- (1990-)
ADSORPTION
AQUIFERS
ARIZONA
CHALCOGENIDES
COLLOIDS
COUNTING TECHNIQUES
DEVELOPED COUNTRIES
DISPERSIONS
ELECTROLYTES
ELECTRON MICROSCOPY
ENVIRONMENTAL QUALITY
ENVIRONMENTAL TRANSPORT
FEDERAL REGION IX
FLOW RATE
HYDROGEN COMPOUNDS
IRON COMPOUNDS
IRON OXIDES
ISOTOPE APPLICATIONS
MASS TRANSFER
MICROSCOPY
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
POLLUTION
SCANNING ELECTRON MICROSCOPY
SCINTILLATION COUNTING
SIZE
SORPTION
SPECTROSCOPY
STABILITY
TRACER TECHNIQUES
TRANSITION ELEMENT COMPOUNDS
TRITIUM COMPOUNDS
USA
WATER POLLUTION
WATER QUALITY
540311* -- Environment
Aquatic-- Basic Studies-- Radiometric Techniques-- (1990-)
ADSORPTION
AQUIFERS
ARIZONA
CHALCOGENIDES
COLLOIDS
COUNTING TECHNIQUES
DEVELOPED COUNTRIES
DISPERSIONS
ELECTROLYTES
ELECTRON MICROSCOPY
ENVIRONMENTAL QUALITY
ENVIRONMENTAL TRANSPORT
FEDERAL REGION IX
FLOW RATE
HYDROGEN COMPOUNDS
IRON COMPOUNDS
IRON OXIDES
ISOTOPE APPLICATIONS
MASS TRANSFER
MICROSCOPY
NORTH AMERICA
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
POLLUTION
SCANNING ELECTRON MICROSCOPY
SCINTILLATION COUNTING
SIZE
SORPTION
SPECTROSCOPY
STABILITY
TRACER TECHNIQUES
TRANSITION ELEMENT COMPOUNDS
TRITIUM COMPOUNDS
USA
WATER POLLUTION
WATER QUALITY