Extraction of radiostrontium coprecipitated with calcium carbonate in soil
The fraction of soil ZSr coprecipitated with calcium carbonate (CaCO3) was determined by extraction into 0.1M hydrochloric acid (HCl)-0.5M potassium chloride (KCl) after an initial extraction with either 1M ammonium acetate (NH4OAc) or 1M KCl to remove soluble salts and exchangeable cations. This procedure was tested on soil samples supplemented with 85 g CaCO3/kg containing coprecipitated YVSr. A significant amount of both YVSr and Ca remained undissolved in this extractant but were subsequently removed by extraction with 8M HNO3. The extraction procedure was also applied to a group of 16 ZSr-contaminated soil and stream bed sediment samples. The amount of Cs + Mg extracted by 0.1M HCl-0.5M KCl, following KCl extraction, was well correlated with but slightly lower than the amounts expected for a complete dissolution of the CaCO3. Pre-extraction with NH4OAc, rather than KCl, dissolved significantly more CaCO3, resulting in a lower estimate of the soil CaCO3. Several soil samples, taken from a radioactive waste burial trench that had received sodium carbonate (Na2CO3) treatment injections, revealed that up to 98% of the total ZSr was observed in a CaCO3 phase. Untreated soils typically exhibited 80 to 95% of their ZSr in a cation exchangeable form, i.e., extractable by either NH4OAc or KCl.
- Research Organization:
- Oak Ridge National Lab., TN
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6183107
- Journal Information:
- Soil Sci. Soc. Am. J.; (United States), Vol. 49:1
- Country of Publication:
- United States
- Language:
- English
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STRONTIUM 85
EXTRACTION
STRONTIUM 90
AMMONIUM COMPOUNDS
CALCIUM CARBONATES
HYDROCHLORIC ACID
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POTASSIUM CHLORIDES
PRECIPITATION
SOIL CHEMISTRY
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ALKALINE EARTH ISOTOPES
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BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HALIDES
HALOGEN COMPOUNDS
HOURS LIVING RADIOISOTOPES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
NUCLEI
OXYGEN COMPOUNDS
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510301* - Environment
Terrestrial- Radioactive Materials Monitoring & Transport- Soil- (-1987)