Uranium and thorium behavior in groundwater of the natural spa area “Choygan mineral water” (East Tuva)

Kopylova, Yu. G.; Гусева, Наталья Владимировна; Shestakova, Anastasia; Khvaschevskaya, Albina; Аракчаа, К. Д.

doi:10.1088/1755-1315/27/1/012034

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…The average concentration of thorium in rocks is three times higher than the concentration of uranium in rock. However, thorium has a weak migration capacity in groundwater . Anthropogenic sources of thorium are created through mining, milling, tin processing, phosphate rock processing and phosphate fertilizer production, and coal-fired utilities and industrial boilers. − …”

Section: Introductionmentioning

confidence: 99%

“…However, thorium has a weak migration capacity in groundwater. 7 Anthropogenic sources of thorium are created through mining, milling, tin processing, phosphate rock processing and phosphate fertilizer production, and coal-fired utilities and industrial boilers. 8−10 There are different ways that thorium can enter the human body and lead to toxicity.…”

Section: ■ Introductionmentioning

confidence: 99%

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Investigation of Chelating Agents for the Removal of Thorium from Human Teeth upon Nuclear Contamination

Ali,

Ma,

Alamova

et al. 2023

Chem. Res. Toxicol.

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Thorium-232 (232Th) is a radioactive heavy metal that is of increasing interest as a source of nuclear energy. However, upon nuclear incidents, the ingestion or inhalation of Th in major quantities can contribute to chemical and radiological health problems, including accumulation in the bone tissue and an increased risk of developing pancreatic, lung, and hematopoietic cancers. The major mineral component of the bone is hydroxyapatite (HAP)also the major mineral component of the teeth. As such, the teeth are the first site of exposure upon oral ingestion of Th-contaminated materials, and Th can pose a potential risk to teeth development. In essence, in the case of human contamination, it is critical to identify effective chelating agents capable of removing Th. Using a batch study methodology, this present work investigates the uptake and the removal of Th from synthetic HAP and from teeth samples by diethylenetriamine pentaacetate (DTPA), ethylenediaminetetraacetic acid (EDTA), and other promising chelating agents. Th uptake over synthetic HAP exceeds 98% at physiological pH with <1 min of contact time and uptake exceeds 90% across the entire pH range. Regarding teeth, over 1 mg Th uptaken per gram of tooth is observed after 24 h. The overall effectiveness of chelating agents for the removal of Th from is as follows: DTPA > EDTA > NaF/mouthwash/3,4,3-LI(1,2-HOPO); this trend was observed both in synthetic HAP and Th-impregnated teeth samples.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Investigation of Chelating Agents for the Removal of Thorium from Human Teeth upon Nuclear Contamination

Ali,

Ma,

Alamova

et al. 2023

Chem. Res. Toxicol.

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“…Regardless of the different solubilities of U and Th, carbonate precipitated from water may also contain some coprecipitated U and detrital Th trapped in the calcite matrix [11,20]. This is relevant in dating applications, where the difference in U and Th concentrations and the U isotopes in rocks are used for correcting the age of carbonate minerals for the effects of detrital contamination [18,19]; these can also be exploited to study water-rock interactions and sources of water mineralization in hydrogeological studies [21,22].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Uranium Isotopes and Classical Geochemical Tracers in Karst Aquifer of Ljubljanica River catchment (Slovenia)

Rovan

Lojen

Zuliani

et al. 2020

Water

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The karst aquifer of the Ljubljanica River catchment, which has numerous springs and sinks, presents an interesting environment for studying hydrogeological processes. This study aims to explore the behavior of U isotopes and to evaluate their use as tracers of hydrogeochemical processes as an alternative to classical geochemical tracers (i.e., physicochemical parameters, elemental ratios, and alkalinity) involved in water–rock interactions and water flow in this karst water system. Basic hydrochemical parameters, as well as the spatiotemporal variations of total U concentrations, 234U/238U activity ratios, and δ238U values, were monitored in water samples from springs and sinks under different hydrological conditions. The bedrock as the source of dissolved and detrital U was also analyzed. Multi-collector inductively couple plasma-mass spectrometry results reveal variations of the 234U/238U activity ratios, which are consistently negatively correlated with the discharge at most analyzed sites. Large 238U/235U isotope fractionation occurred during bedrock weathering, and the large variability of the measured δ238U values is seemingly unrelated to the lithological characteristics of the bedrock or discharge. Our results confirm that 234U/238U activity ratios in water can be used as a tracer for studying changes in groundwater flows and the mixing of waters of different origins under different hydrological conditions.

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“…Located in the Eastern Sayan Mountains, Tuva, Russia, some of these springs are characterized by the bubbling of CO 2 -rich gases. Our group [26,27] have determined the dissolved gas [26], 222 Rn [26] and major and trace chemical compositions of these waters [28,29] (see also previous work summarized in [26,27] as well as making an assessment of the extent of thermodynamic equilibrium of these waters with various minerals [26]). These have enabled preliminary estimates of reservoir temperatures [30,31].…”

Section: Introductionmentioning

confidence: 99%

Geothermometry and Isotope Geochemistry of CO2-Rich Thermal Waters in Choygan, East Tuva, Russia

Shestakova

Гусева

Kopylova

et al. 2018

Water

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The Choygan area of southern Siberia, Russia hosts a variety of CO 2-rich thermal mineral and other waters emerging from springs at temperatures between 7 • C and 39 • C. Chemical analyses of the spring waters (n = 33) were carried out to characterise the waters and determine their origin. A continuum of compositions was observed between relatively lower temperature (7 • C) HCO 3-Ca-Na dominated waters with relatively low amount of total dissolved solids (TDS) and high Eh, and higher temperature (39 • C) HCO 3-Na-Ca dominated waters with higher TDS and lower Eh-this reflects largely conservative mixing of these components between near surface low temperature, oxidising groundwaters and higher temperature, more reducing thermal waters derived from a deeper geothermal reservoir. Stable isotopic data are consistent with all the water ultimately being derived from meteoric water that has undergone varying degrees of isotopic fractionation following evaporation. The inferred δ 18 O and δ 2 H isotopic composition of the unfractionationed meteoric waters is lighter than that expected that of mean annual local precipitation, which together with a strong negative correlation between δ 18 O and the elevation of the sampled discharging springs, suggests recharge at higher elevations (1600 m to 3000 m; average 2600 m). Reservoir temperature, calculated using geothermometers and an analysis of saturation indices of plausible reservoir minerals, ranged from 70 • C to 100 • C at an inferred depth of 2 to 3 km. Not all chemical components were found to follow conservative mixing behaviour. In particular, (i) the CO 2 contents of the waters were highly variable, suggesting either varying degrees of degassing and/or near discharge admixture with air, and (ii) SO 4 concentrations in the lower temperature thermal CO 2-rich waters were highly variable, suggesting a role of near surface oxidation processes, for example of pyrite, in modifying the concentration of redox sensitive components. Limited δ 13 C data are consistent with the CO 2 predominately being derived from dissolution of metamorphic/igneous carbonate minerals in the reservoir. Based on geological conditions, isotope and chemical data, a conceptual circulation model of the Choygan hydrothermal system is proposed.

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Uranium and thorium behavior in groundwater of the natural spa area “Choygan mineral water” (East Tuva)

Cited by 6 publications

References 11 publications

Investigation of Chelating Agents for the Removal of Thorium from Human Teeth upon Nuclear Contamination

Investigation of Chelating Agents for the Removal of Thorium from Human Teeth upon Nuclear Contamination

Comparison of Uranium Isotopes and Classical Geochemical Tracers in Karst Aquifer of Ljubljanica River catchment (Slovenia)

Geothermometry and Isotope Geochemistry of CO2-Rich Thermal Waters in Choygan, East Tuva, Russia

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