Characteristic seasonal variation in dissolved uranium concentration induced by the change of lake water pH in Lake Biwa, Japan

Mochizuki, Akihito; Hosoda, Ko; Sugiyama, Masahito

doi:10.1007/s10201-015-0469-0

Cited by 11 publications

(5 citation statements)

References 30 publications

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“…Table lists the dissolved element concentrations measured in each of the studied saline lakes. Data for Lake Biwa, the largest freshwater lake in Japan, and the ocean are also shown for comparison (Fujinaga et al ; Mochizuki et al ). In addition, a piper diagram for the studied lakes and river, as well as previously published data on carbonate‐depleted saline lakes mentioned below is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Conversely, the freshwater river that feeds Lake Van is dominated by Ca 2 UO 2 (CO 3 ) 3 0 (aq) (70%) and CaUO 2 (CO 3 ) 3 2− (29%). Previous calculations of the chemical species of U in Japanese freshwaters (Lake Biwa and rivers in Okinawa Island) revealed that calcium–uranyl–carbonate complexes were also the predominant species (Mochizuki et al ). In saline lakes where carbonate species are enriched, Ca becomes depleted as CaCO 3 precipitates; therefore, even if U flows in as a calcium–uranyl–carbonate complex, it changes to UO 2 (CO 3 ) 3 4− within the lake.…”

Section: Discussionmentioning

confidence: 99%

“…It is well known that U is adsorbed onto major components of sediments such as ferric (hydr)oxides and clay minerals under neutral pH conditions, and becomes desorbed from them as the pH increases due to the formation of soluble uranyl–carbonate complexes (e.g., Ishibashi et al ; Hsi and Langmuir ; Waite et al ; Pabalan and Turner ). Such adsorption/desorption in association with solid phases depending on water pH controls the distribution and behavior of U in natural waters (e.g., Carling et al ; Mochizuki et al ). Similarly, the formation of UO 2 (CO 3 ) 3 4− and MgUO 2 (CO 3 ) 3 2− probably prevents U from being adsorbed onto solid phases, resulting in high concentrations of dissolved U in carbonate‐rich saline lakes.…”

Section: Discussionmentioning

confidence: 99%

“…Yttrium was used as an internal standard element for the Mo analysis, and Bi as the standard for W and U analysis. Details of the method employed for the U analysis are given in Mochizuki et al (). The detection limits of this method for Mo, W, and U are 20 pmol L −1 , 3.1 pmol L −1 , and 1.6 pmol L −1 , respectively.…”

Section: Methodsmentioning

confidence: 99%

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Distribution of trace elements and the influence of major‐ion water chemistry in saline lakes

Mochizuki

Murata

Hosoda

et al. 2017

Limnology & Oceanography

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Although the water chemistry in saline lakes can differ drastically due to subtle differences in inflowing water conditions, the concentrations, distributions, and geochemical behaviors of trace elements in such environments are poorly understood. In this study, the influence of major‐ion chemistry on the trace element distribution in saline lakes is examined based on major and trace element concentrations and geochemical modeling in three carbonate‐rich saline lakes located in Mongolia and Turkey. The results are compared to data reported from other carbonate‐rich and carbonate‐depleted lakes. The concentrations of U and oxyanions (V, Mo, and W) in carbonate‐rich saline lakes are several orders of magnitude higher than their contributing rivers and seawater. By contrast, their concentrations in carbonate‐depleted saline lakes are lower than those in rivers and oceans. The high U concentrations in carbonate‐rich saline lakes are possibly attributed to the formation of (magnesium–)uranyl–carbonate complexes, and the high oxyanion concentrations are likely a result of the high pH of lake water preventing them from being adsorbed onto solid phases such as suspended particulate matter and sediment. Strontium and Ba concentrations are lower in carbonate‐rich saline lakes than in river water and seawater, but relatively higher in carbonate‐depleted lakes. Incorporation into aragonite and/or calcite, adsorption onto solid phases, and formation of carbonate minerals are possible mechanisms that may account for the lower concentrations of these elements in carbonate‐rich lakes. These results help elucidate the influence of water chemistry on trace element distribution in saline lakes.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Distribution of trace elements and the influence of major‐ion water chemistry in saline lakes

Mochizuki

Murata

Hosoda

et al. 2017

Limnology & Oceanography

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“…Two highly mobile forms will eventually become one of the stable forms (UO 2 CO 3 , UO 2 (OH) − 3 , and UO 2 (OH) + ) when the pH is low enough. A study by Mochizuki [46] on Lake Biwa in Japan showed that the change of lake waters pH affected the leaching process of uranium at the sediment/water interface, which would directly affect the aqueous 238 U concentration. Since KLK is an open lake, it was excluded from the following discussion of close lakes.…”

Section: Response Relationship Of 238 U Concentration To Ph In These mentioning

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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Geochemical and isotopic (U, Th) variations in lake waters in the Qinghai Lake Basin, Northeast Qinghai-Tibet Plateau, China: origin and paleoenvironmental implications

et al. 2019

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Characteristic seasonal variation in dissolved uranium concentration induced by the change of lake water pH in Lake Biwa, Japan

Cited by 11 publications

References 30 publications

Distribution of trace elements and the influence of major‐ion water chemistry in saline lakes

Distribution of trace elements and the influence of major‐ion water chemistry in saline lakes

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

Geochemical and isotopic (U, Th) variations in lake waters in the Qinghai Lake Basin, Northeast Qinghai-Tibet Plateau, China: origin and paleoenvironmental implications

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