Arsenic and uranium contamination of Orog Lake in the Valley of Gobi Lakes, Mongolia: Field evidence of conservative accumulation of U in an alkaline, closed-basin lake during evaporation

Gankhurel, Baasansuren; Fukushi, Keisuke; Davaasuren, Davaadorj; Imai, Eigo; Kitajima, Takuma; Udaanjargal, Uyangaa; Gerelmaa, Tuvshin; Sekine, Yasuhito; Takahashi, Yoshio; Hasebe, Noriko

doi:10.1016/j.jhazmat.2022.129017

Cited by 13 publications

(4 citation statements)

References 50 publications

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“…After the removal of protein by 10% trifluoroacetic acid and centrifugation, the supernatant was passed through a 0.22-μm filter. The filtrate was used to measure the trace minerals in their plasma by inductively coupled plasma mass spectrometry (X7, Thermo Inc., Waltham, MA, USA) 50 .…”

Section: Methodsmentioning

confidence: 99%

Kynurenine promotes Calcitonin secretion and reduces cortisol in the Japanese flounder Paralichthys olivaceus

Ikari

Furusawa

Tabuchi

et al. 2023

Sci Rep

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Deep ocean water (DOW) exerts positive effects on the growth of marine organisms, suggesting the presence of unknown component(s) that facilitate their aquaculture. We observed that DOW suppressed plasma cortisol (i.e., a stress marker) concentration in Japanese flounder (Paralichthys olivaceus) reared under high-density condition. RNA-sequencing analysis of flounder brains showed that when compared to surface seawater (SSW)-reared fish, DOW-reared fish had lower expression of hypothalamic (i.e., corticotropin-releasing hormone) and pituitary (i.e., proopiomelanocortin, including adrenocorticotropic hormone) hormone-encoding genes. Moreover, DOW-mediated regulation of gene expression was linked to decreased blood cortisol concentration in DOW-reared fish. Our results indicate that DOW activated osteoblasts in fish scales and facilitated the production of Calcitonin, a hypocalcemic hormone that acts as an analgesic. We then provide evidence that the Calcitonin produced is involved in the regulatory network of genes controlling cortisol secretion. In addition, the indole component kynurenine was identified as the component responsible for osteoblast activation in DOW. Furthermore, kynurenine increased plasma Calcitonin concentrations in flounders reared under high-density condition, while it decreased plasma cortisol concentration. Taken together, we propose that kynurenine in DOW exerts a cortisol-reducing effect in flounders by facilitating Calcitonin production by osteoblasts in the scales.

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Section: Methodsmentioning

confidence: 99%

Kynurenine promotes Calcitonin secretion and reduces cortisol in the Japanese flounder Paralichthys olivaceus

Ikari

Furusawa

Tabuchi

et al. 2023

Sci Rep

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“…Olgoy Lake (46°33′48″N, 100°6′29″E) is an alkaline lake at about 2100 m elevation in Mongolia, south of the Khangai Mountains, with a salinity of 1−2 g/kg and a pH of 9−10 (Figure 1). 4,13,20 Its average depth is about 1 m, and its surface area is about 1.55 km 2 . The lake has no permanent outlet, and inflowing streams form temporarily during the rainy season, typically from April to October.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…These observations possibly suggest that CO 2 can be absorbed into lake water and converted to carbonate mineral during evaporation in alkaline saline lakes. 20 To assess the applicability of carbonate formation in alkaline saline lakes to NETs, it is necessary to better understand the relationship between the water chemistry of alkaline saline lakes and the formation of authigenic carbonate minerals, for which a full understanding of carbonate mineral equilibria in solution is essential. The important authigenic carbonate minerals in alkaline saline lakes are MHC and AMC.…”

Section: ■ Introductionmentioning

confidence: 99%

“…They observed that pH, alkalinity, and salinity increased with evaporation of the lake water, while Ca and Mg concentrations did not change or decreased. These observations possibly suggest that CO 2 can be absorbed into lake water and converted to carbonate mineral during evaporation in alkaline saline lakes . To assess the applicability of carbonate formation in alkaline saline lakes to NETs, it is necessary to better understand the relationship between the water chemistry of alkaline saline lakes and the formation of authigenic carbonate minerals, for which a full understanding of carbonate mineral equilibria in solution is essential.…”

Section: Introductionmentioning

confidence: 99%

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Solubility of Amorphous Magnesium Carbonate at Low Temperatures: Implications for Carbonate Mineral Formation in Alkaline Lakes

Kitajima

Fukushi

Gankhurel

et al. 2023

ACS Earth Space Chem.

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Amorphous magnesium carbonate (AMC: MgCO 3 •nH 2 O) is a metastable phase with respect to crystalline magnesium carbonate. AMC has been suggested to be an important mineral, a major process of CO 2 fixation in alkaline saline lakes. Understanding the role of AMC for carbon fixation in alkaline lakes requires knowledge of the solubility of AMC under the full range of relevant environmental conditions, but its solubility is poorly known for low water temperatures. In this study, the solubility of AMC at 7 °C was measured in laboratory experiments and compared with chemical analyses of water samples from Olgoy Lake, a natural alkaline saline lake in Mongolia. Laboratory measurements using both supersaturation and undersaturation methods provided very similar solubility products of AMC (log K sp = −5.20 ± 0.02) at 7 °C, which was markedly higher than the solubility product at 25 °C (log K sp = −5.59). The temperature dependence of the solubility of AMC is much greater than that of monohydrocalcite, another important authigenic calcium carbonate in alkaline lakes. Analyses of water from Olgoy Lake consistently showed a significant temperature dependency of ion activity products with respect to magnesium carbonate. The relatively high solubility of AMC at low temperatures implies that the formation of AMC requires relatively high concentrations of dissolved components in lakes. Our results suggest that the formation of AMC is favored more in summer than in winter.

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Health and ecological risks assessment of heavy metals and metalloids in surface sediments of Urmia Salt Lake, Northwest of Iran

Khosravi

Mansour

Ekrami

et al. 2023

Environ Monit Assess

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Arsenic and uranium contamination of Orog Lake in the Valley of Gobi Lakes, Mongolia: Field evidence of conservative accumulation of U in an alkaline, closed-basin lake during evaporation

Cited by 13 publications

References 50 publications

Kynurenine promotes Calcitonin secretion and reduces cortisol in the Japanese flounder Paralichthys olivaceus

Kynurenine promotes Calcitonin secretion and reduces cortisol in the Japanese flounder Paralichthys olivaceus

Solubility of Amorphous Magnesium Carbonate at Low Temperatures: Implications for Carbonate Mineral Formation in Alkaline Lakes

Health and ecological risks assessment of heavy metals and metalloids in surface sediments of Urmia Salt Lake, Northwest of Iran

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