Carbonate adsorption onto goethite as a function of pH and ionic strength. [Yucca Mountain Project:a1]

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:6276957

Rundberg, R S ^[1]; Albinsson, Y ^[2]

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1. Los Alamos National Lab., NM (United States)
2. Chalmers Univ. of Tech., Goeteborg (Sweden). Dept. of Nuclear Chemistry

The adsorption of carbonate onto geothite was studied as a function of both pH and ionic strength (NaClO{sub 4} electrolyte) using {sup 14}C tracer. The pH ranged from 2.5 to 11.6. The ionic strength was controlled by varying the NaClO{sub 4} concentration and ranged from 0.01 to 0.1 molar. The results indicate that carbonate is adsorbed on goethite as primarily an inner-sphere complex at pH values above the point of zero charge. This is inferred from the lack of dependence on ionic strength in the adsorption of carbonate. Below the point of zero charge carbonate is adsorbed by an additional outer-sphere mechanism. An adsorption isotherm was measured at pH 7.0 with an electrolyte concentration of 0.01M. Deconvolution of the isotherm proved that at least two sorption mechanisms exist. These mechanisms lead to large distribution coefficients at low pH. Thereby making the complete removal and exclusion of carbonate from an aqueous goethite system difficult, for the purpose of characterizing a clean'' goethite surface.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6276957
• Report Number(s): LA-UR-91-3244; CONF-9110152-3; ON: DE92002362; TRN: 91-033200
• Resource Relation: Conference: 3. international conference on chemistry and migration behavior of actinides and fission products in the geosphere, Jerez de la Frontera (Spain), 21-25 Oct 1991
• Country of Publication: United States
• Language: English

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58 GEOSCIENCES
ADSORPTION
CHEMICAL REACTION KINETICS
ISOTHERMS
CARBONATES
GEOCHEMISTRY
GOETHITE
SURFACE PROPERTIES
HIGH-LEVEL RADIOACTIVE WASTES
UNDERGROUND DISPOSAL
CARBON 14
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PH VALUE
QUANTITY RATIO
TRACER TECHNIQUES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CARBON COMPOUNDS
CARBON ISOTOPES
CHEMISTRY
EVEN-EVEN NUCLEI
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LIGHT NUCLEI
MANAGEMENT
MATERIALS
MINERALS
NUCLEI
OXIDE MINERALS
OXYGEN COMPOUNDS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
RADIOISOTOPES
REACTION KINETICS
SORPTION
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
YEARS LIVING RADIOISOTOPES
052002* - Nuclear Fuels- Waste Disposal & Storage
580000 - Geosciences