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Migration and Chemical Availability of 137Cs and 90Sr in SwedishLong-Term Experimental Pastures

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Abstract

Migration and chemical availability of 137Cs and90Sr in the long-term was studied on a36-yr-old deposition experiment on pastureconsisting of a sandy soil and a clay soil,contaminated in 1961 with radionuclides in aqueoussolution. Comparisons were made with a study of thesame soils in 1967. Soil samples to 55 cm depth wereanalysed for 137Cs and 90Sr to establish thevertical distribution. Chemical availability wasstudied using sequential extractions with H2O,NH4Ac, NH2OH·HCl, H2O2 andHNO3. Both 137Cs and 90Sr were found atall depths in both soil types. Cs-137 waspredominantly retained within the upper 10 cm (70%)in both soils. For 90Sr, the soils differedsignificantly, retention within the upper 10 cm was27% in sandy soil and 47% in clay soil. Migrationsince 1967 was faster in the sandy soil for bothnuclides. More than 95% of 137Cs was bound inthe acid-digestible and residual fractions in bothsoils. The residual fraction was larger in clay soil.90Sr was highly available in both soils. Noresidual fraction was found, and the easilyexchangeable fraction was 63–75%.

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Author notes

  1. Sverker Forsberg

    Present address: AU-System AB, P.O. Box 47612, SE-117 94, Stockholm, Sweden)

Authors and Affiliations

  1. Department of Soil Sciences, Swedish University of Agricultural Sciences, S-750 07, Uppsala, Sweden

    Sverker Forsberg & Mona Strandmark

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  1. Sverker Forsberg
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  2. Mona Strandmark
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Forsberg, S., Strandmark, M. Migration and Chemical Availability of 137Cs and 90Sr in SwedishLong-Term Experimental Pastures. Water, Air, & Soil Pollution 127, 157–171 (2001). https://doi.org/10.1023/A:1005203900317

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