Physicochemical fractionation of americium, thorium, and uranium in Chernozem soil after sharp temperature change and soil drought
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Petya Kovacheva
,
Svilen Mitsiev
Abstract
A sequential extraction procedure was used to study the changes in the physicochemical forms of americium (Am), thorium (Th), and uranium (U) in laboratory-contaminated Chernozem soil as a result of sharp variations of the environmental temperature and soil moisture. The influence of freezing and soil drought on the radio-ecological hazard was evaluated three months after radioactive contamination with aqueous solutions of 241Am, 234Th, and U. The subsequent changes in the physicochemical forms of the actinides, caused by sharp increases in the environmental temperature and soil moisture, were examined for one month. The data showed that continuous freezing increased the potentially mobile forms of Am and Th but had the opposite effect on U. Prolonged soil drought did not influence the fractionation of Am and Th but led to the redistribution of U between the carbonates and organic matter and caused its immobilisation. The sharp increase in the temperature of the frozen soil caused the immobilisation of Am and Th and increased the potential mobility of U. The warming and enhanced humidity of the dry soil led to the immobilisation of Am and redistribution of U between the soil phases.
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© 2013 Institute of Chemistry, Slovak Academy of Sciences
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Artikel in diesem Heft
- Analytical protocol for investigation of zinc speciation in plant tissue
- Assessment of waxy and non-waxy corn and wheat cultivars as starch substrates for ethanol fermentation
- Effect of quaternary ammonium silane coating on adhesive immobilization of industrial yeasts
- Modeling of supercritical fluid extraction of flavonoids from Calycopteris floribunda leaves
- Determination of limiting current density for different electrodialysis modules
- Dyeing of multiple types of fabrics with a single reactive azo disperse dye
- Physicochemical fractionation of americium, thorium, and uranium in Chernozem soil after sharp temperature change and soil drought
- Ultra-trace determination of Pb(II) and Cd(II) in drinking water and alcoholic beverages using homogeneous liquid-liquid extraction followed by flame atomic absorption spectrometry
- Synthesis, thermal stability, electronic features, and antimicrobial activity of phenolic azo dyes and their Ni(II) and Cu(II) complexes
- Inhibition of copper corrosion in acidic sulphate media by eco-friendly amino acid compound
- Formation of nanostructured polyaniline by dopant-free oxidation of aniline in a water/isopropanol mixture
- Total synthesis of cannabisin F
- Design and synthesis of novel thiopheno-4-thiazolidinylindoles as potent antioxidant and antimicrobial agents
- Microwave-assisted synthesis and antibacterial activity of derivatives of 3-[1-(4-fluorobenzyl)-1H-indol-3-yl]-5-(4-fluorobenzylthio)-4H-1,2,4-triazol-4-amine
- DFT study on [4+2] and [2+2] cycloadditions to [60] fullerene
- Efficient thioacetalisation of carbonyl compounds
- Trimerization of aldehydes with one α-hydrogen catalyzed by sodium hydroxide
