2021
DOI: 10.3390/w13243514
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Non-Equilibrium Uranium as an Indicator of Global Climate Variations—The World Ocean and Large Lakes

Abstract: In natural water, as a rule, there is a violation of radioactive equilibrium in the chain 238U … → 234U → 230Th →. Groundwater usually has a 234U/238U ratio in the range of 0.8–3.0 (by activity). However, in some regions, the 234U/238U ratio reaches >10 and up to 50. Ultrahigh excesses of 234U can be explained by climatic variations. During a cold period, minerals accumulate 234U as a normal component of the radioactive chain, and after the melting of permafrost, it is lost from the mineral lattice faster t… Show more

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Cited by 3 publications
(2 citation statements)
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“…According to 49 – 51 , the average values of activity ratios ( 234 U/ 238 U) of groundwater ranged from 0.51 to 9.02. The 234 U/ 238 U ratio may occasionally move steadily to 5–20 in groundwater at mid- and high-latitudes of the Earth, and may even increase to 50 under certain circumstances 52 – 54 . In other words, the behaviour of uranium concentration in groundwater depends on the relationship between many variables, including pH, oxidation potential, CO 2 partial pressure, the rock matrix of the aquifer and the flow of the groundwater stream.…”
Section: Resultsmentioning
confidence: 99%
“…According to 49 – 51 , the average values of activity ratios ( 234 U/ 238 U) of groundwater ranged from 0.51 to 9.02. The 234 U/ 238 U ratio may occasionally move steadily to 5–20 in groundwater at mid- and high-latitudes of the Earth, and may even increase to 50 under certain circumstances 52 – 54 . In other words, the behaviour of uranium concentration in groundwater depends on the relationship between many variables, including pH, oxidation potential, CO 2 partial pressure, the rock matrix of the aquifer and the flow of the groundwater stream.…”
Section: Resultsmentioning
confidence: 99%
“…The ∼4.5 billion tons of U(VI) in seawater is a thousand times that in terrestrial ore. [3][4][5][6] Meanwhile, ∼27 000 tons of U(VI) is also replenished by rivers yearly. 7,8 How to extract U(VI) from seawater has become a research hotspot, and many schemes, including chemical precipitation, evaporation, ion exchange, and membrane separation, have been reported for U(VI) extraction from seawater. [9][10][11][12][13][14] Adsorption is widely regarded as one of the promising strategies for this target owing to its merits, such as simple operation and environmentally friendly process.…”
Section: Introductionmentioning
confidence: 99%