Unsaturated transport of inorganic cations in undisturbed soil columns

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5990329

Jardine, P M; Jacobs, G K

The unsaturated transport of Sr, Co, and Ca were studied in undisturbed soil columns (14 {times} 40 cm) of saprolitic shale to evaluate the significance of time dependent mass transfer and multispecies competitive exchange during transport. Observed breakthrough curves (BTCs) for Sr and Co were delayed relative to nonreactive Br BTC indicating that the former tracers were adsorbed by the soil. Effluent concentrations of Sr and Co were modeled with the classical convective dispersive (CD) equation and nonequilibrium mass transfer considerations did not appear necessary. Cation exchange equilibria relationships obtained from both shake batch and miscible displacement methods adequately described the thermodynamic processes which were prevalent during transport. These results suggest that the preferential transport of a reactive tracer is negligible for the realistic unsaturated conditions used in the study, and that the massive saprolite within the soil is a chemically active constituent during transport of reactive solutes. The implications of these findings for modeling in-situ subsurface contaminant transport are discussed. 7 refs., 9 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5990329
• Report Number(s): CONF-9009350-1; ON: DE91008873
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
540230* -- Environment
Terrestrial-- Radioactive Materials Monitoring & Transport-- (1990-)
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BROMINE
CALCIUM
CATIONS
CHARGED PARTICLES
CHEMICAL EFFLUENTS
CHEMISTRY
COBALT 60
COBALT ISOTOPES
DATA
ELEMENTS
ENVIRONMENTAL TRANSPORT
EVEN-EVEN NUCLEI
GROUND DISPOSAL
HALOGENS
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MANAGEMENT
MASS TRANSFER
MATERIALS
METALS
MINUTES LIVING RADIOISOTOPES
NATIONAL ORGANIZATIONS
NONMETALS
NUCLEI
NUMERICAL DATA
OAK RIDGE RESERVATION
ODD-ODD NUCLEI
POROSITY
RADIOACTIVE EFFLUENTS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
RADIOISOTOPES
RADIONUCLIDE MIGRATION
ROCKS
SEDIMENTARY ROCKS
SHALES
SOIL CHEMISTRY
SOILS
STRONTIUM 90
STRONTIUM ISOTOPES
SUBSURFACE ENVIRONMENTS
THEORETICAL DATA
THERMODYNAMIC ACTIVITY
TIME DEPENDENCE
US DOE
US ERDA
US ORGANIZATIONS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
YEARS LIVING RADIOISOT
YEARS LIVING RADIOISOTOPES