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Research article2005Peer reviewed

Role of the fungal mycelium in the retention of radiocaesium in forest soils

Vinichuk MM, Johanson KJ, Rosen K, Nilsson I

Abstract

The aim of this work was to study possible binding of Cs-137 to various organic components in the soil and fungi, by using various sequential extraction procedures. The retention and binding of Cs-137 has been studied in two horizons O-f/O-h and A(h)/B of a Ukrainian forest soil. The exchangeable fractions Cs-137 from soil (sum of H2O and 1 M NH4OAc fraction) were found to be 12% in the organic-rich layer (range 11-14%) and 23% in the organic-poor (range 20-29%). The hydrolysis with 10% H2SO4 resulted in an additional release of 30% of Cs-137 from the organic-rich soil (range 30-35%) and 38% from the organic-poor soil horizon (range 27-53%). Extraction with 30% H2O2 released 11 and 15% of the Cs-137 activity from organic-rich and organic-poor soil horizons. The corresponding values for treatment with 98.8% NaOCl were about 27% in both types of soil. About 11% of the total Cs-137 activity was found in the humic acid fraction, about 5% in the fulvic fraction and 46% in the residue fraction. Relatively high level of Cs-137 activity in soil (ca. 50%) was thus still left unsolved in the residue fraction. About 29% of Cs-137 activity concentration in fungal mycelia was found as water soluble with a range of 11 to 41%. Additionally 24% of the Cs-137 activity from mycelia was released by 1 M ammonium acetate extraction. Together, water and 1 M ammonium acetate extraction released about 53% of the total Cs-137 activity in the mycelia. In fruit bodies of mycorrhizal fungi, 68% of the total Cs-137 inventory was found to be water soluble at room temperature and 93% at 80degreesC. (C) 2004 Elsevier Ltd. All rights reserved

Published in

Journal of Environmental Radioactivity
2005, Volume: 78, number: 1, pages: 77-92
Publisher: ELSEVIER SCI LTD

      SLU Authors

    • Vinichuk, Mykhailo

      • Department of Soil Sciences, Swedish University of Agricultural Sciences

      • Rosén, Klas

        • Department of Soil Sciences, Swedish University of Agricultural Sciences

        • Nilsson, Ingvar

          • Department of Soil Sciences, Swedish University of Agricultural Sciences

        UKÄ Subject classification

        Agricultural Science
        Environmental Sciences related to Agriculture and Land-use

        Publication identifier

        DOI: https://doi.org/10.1016/j.jenvrad.2004.02.008

        Permanent link to this page (URI)

        https://res.slu.se/id/publ/9190