Forms of Uranium Presence in Soil on the Territory of the Sublimate Shop at AEKhK AO

Maryakhin, M. A.; Vlasova, I. E.; Varlakova, G. A.; Germanov, A. V.; Varlakov, A. P.; Калмыков, С. Н.; Петров, В. Г.; Romanchuk, Anna Yu.; Yapaskurt, Vasiliy O.; Trigub, Alexander L.

doi:10.1134/s1066362221010173

Cited by 2 publications

(2 citation statements)

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“…The uranium concentration in the sample varied in the range from 2 mg g À1 to 4 mg g À1 . A more detailed analysis of the morphology and mineral composition of contaminated soil is given by Maryakhin et al (2021). In the discussion below, the sample of uranium contaminated soil will be referred to as the UCS sample.…”

Section: Methodsmentioning

confidence: 99%

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From EXAFS of reference compounds to U(VI) speciation in contaminated environments

Krot¹,

Vlasova²,

Trigub³

et al. 2022

J Synchrotron Rad

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Understanding the speciation of technogenic uranium in natural systems is crucial for estimating U migration and bioavailability and for developing remediation strategies for contaminated territories. Reference EXAFS data of model laboratory-prepared uranium compounds (`standards') are necessary to analyze U-contaminated samples from nuclear legacy sites. To minimize errors associated with measurements on different synchrotrons, it is important not only to compare data obtained on environmentally contaminated samples with the literature but also with `standards' collected at the same beamline. Before recording the EXAFS spectra, all reference compounds were thoroughly characterized by Raman spectroscopy and powder X-ray diffraction. The U(VI) local molecular environments in the reference compounds, i.e. uranyl oxyhydroxides, phosphates, carbonates and uranates, were examined using XAFS. Based on the EXAFS fitting results obtained, including the nature of the bonding, interatomic distances and coordination numbers, parameters that are typical for a particular U compound were differentiated. Using data for `standards', U speciation in the sample of radioactively contaminated soil was determined to be a mixture of U oxyhydroxide and carbonate phases.

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Section: Methodsmentioning

confidence: 99%

“…The sample of uranium-contaminated soil (UCS) mainly consists of clay minerals, quartz and feldspar with a particle size < 100 mm (Maryakhin et al, 2021). SEM images show the presence of 3-7 mm particles and aggregates with high U concentrations (Fig.…”

Section: Sample Of Uranium Contaminated Soilmentioning

confidence: 99%