Speciation and mobility of uranium in tailings materials at the U-production legacy site in Ukraine

Korychenskyi, Kyrylo; Laptev, Gennady; Voitsekhovych, Oleg; Lavrova, T.V.; Dyvak, T.I.

doi:10.15407/jnpae2018.03.270

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…The reason might be that the RA sample contained high concentrations of U content which is highly mobile [26] and the fact that the RA sample had the lowest pH and the lowest CEC compared to all the samples. According to Korychenskyi et al [58], a higher uranium content coupled with organic complexes in the oxidizable fraction is an indication that under normal conditions this fraction is insoluble in water and will be retained in the soil. Additionally, Uranium has a valence of + VI (UO 2 2+ uranyl ion), the most stable and mobile form in an oxidant soil environment [59].…”

Section: Discussion Of Pte Distributionmentioning

confidence: 99%

Mobility of Potentially Toxic Elements from the Abandoned Uranium Mine’s Spoil Bank

Khumalo

Heltai

Várhegyi³

et al. 2021

Ecological Chemistry and Engineering S

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This study is part of the ongoing environmental monitoring program of the abandoned Mecsek uranium mine during the remediation period. During this program on the recultivated No.1 spoil bank, the radioactivity and the potentially toxic element (PTE) contents in the covering soil had shown some anomalies which refers to possible migration alongside the slope. Therefore, in a previous study, soil and plant samples were collected from top to bottom position of the slope and the total element content was determined by multi-elemental inductively coupled plasma-optical emission spectrometry. The results have indicated that there was a high possibility for PTEs to be mobile and available for uptake by plants. To confirm this indication in the present study for the soil samples the BCR sequential extraction procedure was applied to characterise the environmental mobility of PTEs, and it was compared with soil pH and cation exchange capacity (CEC). The results indicated that the ratio of Cd, Co, Mn, Pb, and U in the non-residual fractions ranged between 36.8 to 100 % and increased from top to bottom direction. The comparison showed that the samples with the lowest pH and CEC had the most mobility of the PTEs. The distribution of U, Cd, Mn, Co, and Pb in fractions indicated that some parts of the spoil deposit require additional steps to hinder the migration through the covering soil layer, and the BCR sequential extraction procedure has proven to be useful in providing information for the planning and management of remediation operations.

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Section: Discussion Of Pte Distributionmentioning

confidence: 99%

Mobility of Potentially Toxic Elements from the Abandoned Uranium Mine’s Spoil Bank

Khumalo

Heltai

Várhegyi³

et al. 2021

Ecological Chemistry and Engineering S

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“…[3,4]. Раніше аналіз вмісту радіонуклідів уранового ряду, а також характеристик вмісту хімічними елементами підземних вод на майданчику колишнього ВО «ПХЗ» виконано у роботах [5,6,7,8].…”

Section: рис 1 картосхема проммайданчика колишнього во «пхз» (м кам'я...unclassified

“…Характерною особливістю підземних вод техногенного горизонту і найближчого ореолу алювіальних вод хвостосховища «Центральний Яр» є підвищені рівні їх кислотності (рН=3-5) [8] на відміну від інших хвостосховищ, де кислотність вод має показники рН=6-8. Одним із пояснень такої різниці у геохімічних умовах, які також впливають на формування хімічного складу вод можуть бути обставини застосування різних технологій вилуговування і нейтралізації шламів залишків екстракції урану із збагачених уранових руд і шлаків уран містких залізних руд.…”

Section: таблиця 3 оцінка формул хімічного складу вод а також індексі...unclassified

Assessment of Temporal and Space-Time Changes of Groundwater Chemical Composition at the “Рridniproivsky Chemical Plant” Uranium Production Legacy Site

Lavrova¹,

Korychenskyi²,

Voitsekhovych³

2022

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This study provides an analysis of data from long-term (2005-2021) observations of the chemical composition of groundwater in the impact zone of the former uranium ore processing enterprise (Production Union Prydniprovskyi Chemical Plant (PU “PChP”) in the city of Kamianske, in particular, areas of near-surface tailings of uranium ore processed residues (“Zapadnoe”, “Central Yar” and others). All tailings on the site of the former PU “PChP” were built without installation of anti-permeable barriers, and therefore under the influence of atmospheric precipitation, the water, formed in the tailings body, highly contaminated of uranium series radionuclides and residues of chemical reagents, can penetrate to the groundwater aquifers, with which they spread beyond the limits of their technological localization in tailings. In addition, the entire territory of the former industrial site of mining and chemical production “PChP” is a complex of former enterprises, septic tanks, production waste holding sites, warehouses of chemical reagents and residues of former production, which are also sources of man-made pollution of the territory and influence on chronic pollution of groundwater. Therefore, environmental monitoring programs in the impact zone of tailings impoundments included not only monitoring of indicators of the content of uranium series radionuclides in elements of the natural environment, but also studying of the chemical composition of waters. The analysis of observation data during the period from 2005 to 2021 was carried out in order to assess the extent of the spread of polluted waters beyond the limits of the location of the tailings ponds, to identify major macroions in the composition of groundwater as indicators for assessing the spread of the contamination plume beyond the boundaries of the tailings ponds, as well as to identify patterns of formation the groundwater quality within the site under the influence of man-made and natural factors. It is shown that the mineralization of groundwater, as well as its chemical composition, significantly changed as the sampling site moved away from the tailings. Changes in the chemical composition of water and the dominant content of the major macroions at different distances from the tailing’s ponds made it possible to determine the difference in the characteristics of the influence of infiltration waters from the source of the tailing’s ponds and scattered sources of pollution within the boundaries of the PChP site along the groundwater flow line. The main factors of uncertainty in the estimations of the formation of groundwater chemistry in the zone of the industrial complex are shown, which must be taken into account for the development of the network of monitoring observations.

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“…I. Consequently, there was a question of the adequacy of the 1-meter thick soil covering layer used to cover the spoil deposit. The lack of soil cover stability induces acute downward migration of radionuclides and PTEs [37]. The ongoing environmental monitoring program in the Mecsek uranium mine identified that spoil deposit No.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Possible Relationship between Physico-Chemical Properties of the Covering Soil and the Mobility of Radionuclides and Potentially Toxic Elements in a Recultivated Spoil Bank

Horváth

Heltai

Várhegyi³

et al. 2022

Minerals

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This study is part of the ongoing environmental monitoring program of the abandoned Mecsek uranium mine. On the mine’s recultivated spoil deposit No. I, anomalies that refer to possible migration alongside the slope were detected. The present study was conducted to supplement the ongoing monitoring study with a sampling strategy and analytical methods that can characterize the mobility of potentially toxic elements and radionuclides. A sampling strategy was developed: the vegetation and soil core samples were collected from the slope from top to bottom of the deposit, and nearby this spoil deposit, water samples were collected. Elemental analyses were conducted: the pseudo-total analysis, a total concentration of uranium in water, and the BCR sequential extraction analysis. The radionuclides were determined by gamma spectrometry and alphaGUARD. Additionally, the soil and plant moisture content, soil organic matter, pH, and cation exchange capacity (CEC) were determined. The Pearson correlation analysis and the principal component analysis, considering all possible influencing factors, verified that the elemental concentration increase from the top to the bottom direction of the deposit is strongly influenced by the soil pH, CEC, and Ca content. The mobility of Cd, Co, Mn, Pb, and U is relatively high and significantly migrates down the slope.

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Speciation and mobility of uranium in tailings materials at the U-production legacy site in Ukraine

Cited by 7 publications

References 9 publications

Mobility of Potentially Toxic Elements from the Abandoned Uranium Mine’s Spoil Bank

Mobility of Potentially Toxic Elements from the Abandoned Uranium Mine’s Spoil Bank

Assessment of Temporal and Space-Time Changes of Groundwater Chemical Composition at the “Рridniproivsky Chemical Plant” Uranium Production Legacy Site

A Study on the Possible Relationship between Physico-Chemical Properties of the Covering Soil and the Mobility of Radionuclides and Potentially Toxic Elements in a Recultivated Spoil Bank

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