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Transport of inorganic colloids through natural aquifer material: implications for contaminant transport

Technical Report ·
OSTI ID:5564370
;
The stability and transport of radiolabeled Fe2O3 particles were studied using laboratory batch and column techniques. Core material collected from a shallow sand and gravel aquifer was used as the immobile column matrix material. Variables in the study included flow rate, pH, ionic strength, electrolyte composition, particle concentration, and particle size. Transport was highly dependent upon colloidal stability. Iron oxide colloids were not only mobile to a significant extent, but under some hydrogeochemical conditions were transported faster than tritiated water, a conservative tracer. The extent of colloid breakthrough was dependent upon a variety of parameters; however, the highest statistical correlation was observed with particle size and anionic composition of the supporting electrolyte. Arsenate was utilized for assessment of colloid-contaminant and contaminant-aquifer interactions and comparison of dissolved and colloidally associated transport in dynamic model systems. The rate of colloid-associated arsenate transport was over 21 times that of the dissolved arsenate. (Copyright (c) 1992 American Chemical Society.)
Research Organization:
Environmental Protection Agency, Ada, OK (United States). Robert S. Kerr Environmental Research Lab.
OSTI ID:
5564370
Report Number(s):
PB-92-158690/XAB; EPA--600/J-92/113
Country of Publication:
United States
Language:
English

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Related Subjects

54 ENVIRONMENTAL SCIENCES
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
ARSENIC
CHALCOGENIDES
COLLOIDS
CONTAMINATION
DISPERSIONS
ELECTROLYTES
ELEMENTS
ENVIRONMENTAL TRANSPORT
FLOW RATE
GROUND WATER
HYDROGEN COMPOUNDS
INORGANIC COMPOUNDS
IRON COMPOUNDS
IRON OXIDES
MASS TRANSFER
MATHEMATICAL MODELS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PERMEABILITY
POLLUTION
SEMIMETALS
SIZE
STABILITY
TRANSITION ELEMENT COMPOUNDS
WATER
WATER POLLUTION