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1336-9075
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Volume 68, Issue 5 (May 2014)

Issues

Influence of freezing on physicochemical forms of natural and technogenic radionuclides in Chernozem soil

Petya Kovacheva
  • Faculty of Chemistry and Pharmacy, University of Sofia “St. Kliment Ohridski”, 1, J. Bourchier Blvd., Sofia, 1164, Bulgaria
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/ Rumyana Djingova
  • Faculty of Chemistry and Pharmacy, University of Sofia “St. Kliment Ohridski”, 1, J. Bourchier Blvd., Sofia, 1164, Bulgaria
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Published Online: 2014-01-28 | DOI: https://doi.org/10.2478/s11696-013-0483-9

Abstract

Sharp variations of different climatic parameters influence the transport, transfer, and deposition of contaminants in nature. Investigations of the impact of environmental temperature on the fractionation of radionuclides in soil are necessary for adequate assessment of their distribution and bioavailability in case of a nuclear accident. The impact of a sharp decrease of environmental temperature shortly after radioactive contamination on the physicochemical fractionation of natural and technogenic radionuclides in Chernozem soil and its influence on their potential migration ability and bioavailability in case of subsequent warming were evaluated. The soil was contaminated in a laboratory with 241Am, 60Co, 137Cs, 228Ra, 234Th, and U and two temperature regimes were used for storage. Changes of the radionuclides association with various soil phases in the first weeks after contamination were studied. Physicochemical forms of 241Am, 60Co, 228Ra, 234Th, and U were determined using two sequential extraction procedures. The ion-exchangeable forms of 137Cs were evaluated by single extraction with 1 M NH4NO3. The data showed that the freezing, following the radioisotope contamination of the soil, causes an increase of the amount of potentially mobile forms of radiocobalt, radiocesium, radium, and thorium and has an insignificant impact on the fractionation of americium and uranium.

Keywords: radionuclides; physicochemical forms; freezing; Chernozem soil

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About the article

Published Online: 2014-01-28

Published in Print: 2014-05-01


Citation Information: Chemical Papers, ISSN (Online) 1336-9075, DOI: https://doi.org/10.2478/s11696-013-0483-9.

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