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SURFACE CHEMICAL EFFECTS ON COLLOID STABILITY AND TRANSPORT THROUGH NATURAL POROUS MEDIA
Citation:
Puls, R., C. Paul, AND D. Clark. SURFACE CHEMICAL EFFECTS ON COLLOID STABILITY AND TRANSPORT THROUGH NATURAL POROUS MEDIA. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/351 (NTIS PB93228575), 1993.
Description:
Surface chemical effects on colloidal stability and transport through porous media were investigated using laboratory column techniques. pproximately 100m diameter, spherical, iron oxide particles were synthesized as the mobile colloidal phase. he column Packing material was retrieved from sand and gravel aquifer on Cape Cod, MA. revious studies have indicated enhanced stability and transport of iron oxide particles due to specific adsorption of some inorganic anions on the iron oxide surface. his phenomenon was further evaluated with an anionic surfactant, sodium dodecyl sulfate. urfactants constitute a significant mass of the contaminant loading at the Cape Cod site and their presence may contribute to colloidal transport as a significant transport mechanism at the site. ther studies at the site have previously demonstrated the occurrence of this transport mechanism for iron phosphate particles. hoton correlation spectroscopy, micro-electrophoretic mobility, and scanning electron microscopy were used to evaluate Particle stability, mobility, and size. dsorption of negatively charged organic and inorganic species onto the surface of the iron oxide particles was shown to significantly enhance particle stability and transport through alterations of the electrokinetic properties of the particle surface. article breakthrough was primarily dependent upon colloidal stability and surface charge.
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SURFACE CHEMICAL EFFECTS ON COLLOID STABILITY AND TRANSPORT THROUGH NATURAL POROUS MEDIA