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Extraction of radiostrontium coprecipitated with calcium carbonate in soil

Extraction of radiostrontium coprecipitated with calcium carbonate in soil

Soil Science Society of America Journal 49(1): 69-73

The fraction of soil 90Sr coprecipitated with CaCO3 was determined by extraction into 0.1 M HCl-0.5 M KCl after an initial extraction with either 1 M ammonium acetate (NH4OAc) or 1 M KCl to remove soluble salts and exchangeable cations. This procedure was tested on soil samples supplemented with 85 g CaCO3/kg containing coprecipitated 85Sr. The 85Sr and Ca in this Ca(85Sr)CO3 behaved identically in the extraction sequences. In the absence of soil, about 95% of the Ca(85Sr)CO2 dissolved into the 0.1 M HCl-0.5 M KCl following the KCl extraction. In the presence of soil, a significant amount of both 85Sr and Ca remained undissolved in this extractant but were subsequently removed by extraction with 8 M HNO3. Ammonium acetate, however, extracted more Ca and 85Sr from Ca(85Sr)CO3, with or without soil, than did KCl. The extraction procedure was also applied to a group of 16 90Sr-contaminated soil and streambed sediment samples which contained 0-7.9 g carbonate-C/kg (0-66 g CaCO3/kg). The amount of Ca + Mg extracted by 0.1 M HCl-0.5 M 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 Na2CO3 treatment injections, revealed that up to 98% of the total 90Sr was observed in a CaCO3 phase. Untreated soils typically exhibited 80-95% of their 90Sr in a cation exchangeable form, i.e., extractable by either NH4OAc or KCl.

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Accession: 001364955

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DOI: 10.2136/sssaj1985.03615995004900010013x

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