Radiogenic 234U and 210Po in humus acids of dyctionemic shale

Bogdanov, R.V.; Timofeev, S.A.; Selivanov, S. S.

doi:10.1134/s1066362206040187

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…In addition, humic substances (HS), including fulvic acid and humic acid, have a strong complexing ability for 238 U of all types of organic matter. If the bottom sediment of a lake is covered with a large amount of organic matter, 238 U could precipitate after forming organic complexes with HS, thereby reducing the concentration of 238 U in the lake waters [49,50]. Some researches mentioned that Qinghai is one of the few provinces in China where natural Artemia is distributed and GH is the largest saline lake producing Artemia in Qaidam Basin of Qinghai Province [51][52][53].…”

Section: Response Relationship Of 238 U Concentration To Organic Mattmentioning

confidence: 99%

Distribution Characteristics and Influencing Factors of Uranium Isotopes in Saline Lake Waters in the Northeast of Qaidam Basin

Zhao

Zhang

et al. 2020

Minerals

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Four saline lakes in the northeast of Qaidam Basin were selected to explore the distribution characteristics and influencing factors of uranium isotopes in lake waters with high evaporation background. The 238U concentration and the activity ratios of 234U/238U ([234U/238U]AR) showed that there was no significant change in the same lake, but there was a certain degree of difference in the distribution between different lakes. We found that aqueous 238U concentration within a certain range increased with an increase in TDS (total dissolved solid) and salinity, as was also the case with pH. As in natural waters, the pH affects the speciation of 238U, but TDS and salinity affect the adsorption process of aqueous 238U. Further, the replenishment of water will also affect the uranium isotope concentration for lakes, but it is not the main influencing factor for saline lakes. Therefore, we suggest that pH is the dominant factor affecting changes in aqueous 238U concentration of the sampled saline lakes. The [234U/238U]AR in these saline lakes are closely related to the input water and the associated water–rock interactions involving sediments, atmosphere dust, and organic material, etc. during the evolution stage, metamorphous degree, and hydrochemistry of the saline lakes. Lake water samples collected in the maximum and minimum discharge water period, were used to evaluate the seasonal distribution characteristics of aqueous 238U, and we found that 238U concentration did not show an evident change with the seasons in these saline lakes. If the 238U concentration and [234U/238U]AR can remain consistent during a period of time, then the sediment ages and/or sedimentation rates could be determined by lake sediment and/or biogenic carbonate in future, thus allowing for the accurate reconstruction of the paleoclimate and paleoenvironment.

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Section: Response Relationship Of 238 U Concentration To Organic Mattmentioning

confidence: 99%

Distribution Characteristics and Influencing Factors of Uranium Isotopes in Saline Lake Waters in the Northeast of Qaidam Basin

Zhao

Zhang

et al. 2020

Minerals

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“…Humic acid, present in the ground water from moors and bogs, is particularly adept at making water soluble complexes. Thus its effect upon adsorbed uranium, 264 thorium 300,301 and polonium is to put these elements back into aqueous solution. This has been studied 278 for many radio-elements otherwise immobilised in river sediments.…”

Section: Complex Formation and Valency Changesmentioning

confidence: 99%

Radiochemistry

Urch

2007

Annu. Rep. Prog. Chem., Sect. A: Inorg. Chem.

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Radiogenic 234U and 210Po in humus acids of dyctionemic shale

Cited by 2 publications

References 12 publications

Distribution Characteristics and Influencing Factors of Uranium Isotopes in Saline Lake Waters in the Northeast of Qaidam Basin

Distribution Characteristics and Influencing Factors of Uranium Isotopes in Saline Lake Waters in the Northeast of Qaidam Basin

Radiochemistry

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