Sorption of anions of iodine by iron oxides and kaolinite
The sorption of iodide, iodate, and periodate ions by kaolinite, hematite and pelagic red clay in buffer solutions and sea water was studied. Iodate ions (IO/sup -//sub 3/) are strongly absorbed by hematite (Fe/sub 2/O/sub 3/) at pH values up to 9. The reaction is rapid and reversible and apparently occurs by replacement of OH/sup -/ ionson the surface. Periodate ions (IO/sup -//sub 4/) are more strongly sorbed by Fe/sub 2/O/sub 3/ than IO/sup -//sub 3/ ions; iodide ions (I/sup -/) appear to be less strongly sorbed. At pH 4, hematite-free, goethitefree kaolinite sorbs IO/sup -//sub 3/ only slightly and I/sup -/ not at all. IO/sup -//sub 3/ is stable relative to I/sup -/ in the presence of oxygen, and occurs in surface waters and in seawater. Small amounts of finely divided iron oxides, which are present in many types of sediments, may play a major role in the geochemistry of iodine by absorbing IO/sup -//sub 3/. For example, in one experiment pelagic red clay was found to be about as active as reagent Fe/sub 2/O/sub 3/ in removing dissolved IO/sup -//sub 3/ from seawater. This result suggests that pelagic red clay may be an appropriate host for disposal of radioactive iodine-129. Experiments on sorption of radioactive I/sup -/ by sedimentary minerals are reported in the literature. In many of these experiments, some of the iodine is likely to have been in the IO/sup -//sub 3/ or IO/sup -//sub 4/ form, which would have been sorbed by iron oxide impurities. The results of sorption experiments with radioactive iodine are considered dubious unless the oxidation state and the mineralogical purity are established.
- Research Organization:
- Argonne National Laboratory, Argonne, IL
- OSTI ID:
- 6033308
- Journal Information:
- Nucl. Chem. Waste Manage.; (United States), Vol. 4:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
CLAYS
SORPTIVE PROPERTIES
HEMATITE
IODINE 129
ABSORPTION
RADIOACTIVE WASTE DISPOSAL
UNDERGROUND DISPOSAL
IODINE COMPOUNDS
IRON OXIDES
KAOLINITE
BUFFERS
CHEMICAL REACTION KINETICS
COMPARATIVE EVALUATIONS
IODATES
IODIDES
MINERALOGY
OXIDATION
PERIODATES
RADIOACTIVE WASTES
SEAWATER
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHALCOGENIDES
CHEMICAL REACTIONS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IODINE ISOTOPES
IRON COMPOUNDS
IRON ORES
ISOTOPES
KINETICS
MANAGEMENT
MATERIALS
MINERALS
NUCLEI
ODD-EVEN NUCLEI
ORES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
RADIOACTIVE MATERIALS
RADIOISOTOPES
REACTION KINETICS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
WATER
YEARS LIVING RADIOISOTOPES
052002* - Nuclear Fuels- Waste Disposal & Storage
510301 - Environment
Terrestrial- Radioactive Materials Monitoring & Transport- Soil- (-1987)
520301 - Environment
Aquatic- Radioactive Materials Monitoring & Transport- Water- (1987)