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Radiochemistry

, Volume 45, Issue 3, pp 250–256 | Cite as

Bioaccumulation of Tc, Pu, and Np on Bottom Sediments in Two Types of Freshwater Lakes of the Moscow Oblast

  • K. E. German
  • E. V. Firsova
  • V. F. Peretrukhin
  • T. V. Khizhnyak
  • M. Simonoff
Article

Abstract

A laboratory study is made of Tc, Np, and Pu accumulation by natural and sterilized silts collected from two typical eutrophic and dystrophic lakes of the Moscow oblast. After a short inductive period (1-3 days), the rate of Tc uptake by the eutrophic lake silt is about twice that by the dystrophic lake silt (at a dry solid to liquid phase ratio of 0.033 g ml-1). The rate is only slightly temperature-dependent, being practically constant (at a level of about 3% per day) under certain conditions. The distribution coefficients after a month of contact were found to be 1700±50 and 56±5 ml g-1 for the eutrophic and dystrophic lake silts, respectively. Sulfate and nitrate have an inhibiting effect on the Tc uptake. Efficient desorption of Tc from bottom sediments can be realized only in the presence of an oxidant (H2O2), suggesting the reductive mechanism of Tc sorption on silts, complicated by either complexation with microorganism cell components or by intracellular deposition.

Keywords

Silt Bottom Sediment Bioaccumulation Distribution Coefficient Inductive Period 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© MAIK “Nauka/Interperiodica” 2003

Authors and Affiliations

  • K. E. German
    • 1
  • E. V. Firsova
    • 1
  • V. F. Peretrukhin
    • 1
  • T. V. Khizhnyak
    • 1
  • M. Simonoff
    • 2
  1. 1.Institute of Physical ChemistryRussian Academy of SciencesMoscowRussia
  2. 2.UMR 5084 - Chimie Nucleaire Analytique et BioenvironnementaleLe Haut VigneauGradignanFrance

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