Main Title |
Monodisperse Ferrous Phosphate Colloids in an Anoxic Groundwater Plume. |
Author |
Gschwend, P. M. ;
Reynolds, M. D. ;
|
CORP Author |
Massachusetts Inst. of Tech., Cambridge. Dept. of Civil Engineering.;Robert S. Kerr Environmental Research Lab., Ada, OK. |
Year Published |
1987 |
Report Number |
EPA-R-812466; EPA/600/J-87/056; |
Stock Number |
PB87-213310 |
Additional Subjects |
Fluid infiltration ;
Ground water ;
Wells ;
Sewage disposal ;
Sorbents ;
Contaminants ;
Sorption ;
Surface chemistry ;
Reprints ;
Ferrous phosphate ;
Cape Cod(Massachusetts)
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB87-213310 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
21p |
Abstract |
Groundwater samples collected near a secondary-sewage infiltration site on Cape Cod, Massachusetts, were examined for colloidal materials (10-1000 nm). In two wells the water contained a population of monodisperse 100-nm particles, detected using laser-light scattering and autocorrelation data processing. SEM and SEM-EDAX analysis of these colloidal materials collected on ultrafilters confirmed the laser light scattering result and revealed that these microparticles consisted of primarily iron and phosphorus in a 1.86 Fe to 1.0 P stoichiometric ratio. Chemcial analyses of the water samples, together with equilibrium solubility calculations, strongly suggest that the ion-activity product should exceed the solubility product of a 100-nm diameter predominantly vivianite-type colloidal phase. In light of the results, researchers conclude that these microparticles were formed by sewage-derived phosphate combining with ferrous iron released from the aquifer solids, and that these colloids may be moving in the groundwater flow. Such a subsurface transport process could have major implications regarding the movement of particle-reactive pollutants traditionally viewed as non-mobile in groundwater. (Copyright (c) 1987 Elsevier Science Publishers B.V.) |
Supplementary Notes |
Pub. in Jnl. of Contaminant Hydrology, v1 n3 p309-327 Mar 87. Sponsored by Robert S. Kerr Environmental Research Lab., Ada, OK. |
NTIS Title Notes |
Journal article. |
Title Annotations |
Reprint: Monodisperse Ferrous Phosphate Colloids in an Anoxic Groundwater Plume. |
PUB Date Free Form |
c1987 |
Category Codes |
48G; 68D |
NTIS Prices |
PC A02/MF A01 |
Primary Description |
600/15 |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
726829376 |
Origin |
NTIS |
Type |
CAT |