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Sorption of Tc(IV) and Tc(VII) on Soils: Influence of Humic Substances |
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| Authors: | P Tkáč R Kopunec F Macášek S Skrašková |
| Institution: | (1) Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University, SK-842 15 Bratislava, Slovak Republic;(2) Department of Nuclear Chemistry, Faculty of Natural Sciences, Comenius University, SK-842 15 Bratislava, Slovak Republic;(3) Oncology Institute of St. Elizabeth, Nuclear Medicine Clinics, SK-812 50 Bratislava, Slovak Republic |
| Abstract: | The technetium sorption behaviour in different samples of soils was studied under aerobic conditions. Tc(VII) was reduced to Tc(IV) by Sn2+ ions. About 99% of reduced technetium is absorbed by the soils under investigation. Sorption of TcO4 – was studied in short-term (1-hour) and long-term (1-month) experiments. Sorption of TcO4 – in presence of sodium humate (Aldrich) was generally lower than from pure water (from 99% to 12%) and depends on the depth of origin of the ground. Immobilisation of TcO4 – after sorption on superficial sample of soils was studied by paper chromatography. Oxidation of Tc(IV) in presence of NO3 – and NO2 – (concentration range 10–1–10–5 mol·dm–3) ions was studied as a function of time and concentration of NO3 – and NO2 – ions. The content of Tc(IV) in NO3 – and NO2 – solutions decreases with time (46 hours) relatively slowly. |
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