Iodine and selenium speciation in natural waters and their concentrating at landscape-geochemical barriers

Korobova, Elena; Ryzhenko, B. N.; Cherkasova, E. V.; Sedykh, É. M.; Korsakova, N. V.; Danilova, V. N.; Khushvakhtova, S. D.; Berezkin, Victor

doi:10.1134/s001670291404003x

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…According to the data obtained in the course of calculations on a new experimental material, the assumption was confirmed that the high mobility of iodine in the studied natural waters can be caused by migration not only in the form of simple ions (I-, IO3-), but also complex compounds, both organic and minerals in the form of CaI + , MgI + , KI, NaI. In early works it has already been shown [17,18]. The content of complex iodine ions with calcium, potassium, magnesium, sodium and stable strontium in the studied waters was 2.2%, 1.25%, 0.9%, 3.4% and 1.3%, respectively.…”

Section: Iodinesupporting

confidence: 58%

Theoretical evaluation of iodine and selenium speciation in the natural waters of iodine-deficient territories

et al. 2019

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Water migration of iodine, selenium are in many cases directly related to manifestation of thyroid pathologies, in particular, the endemic goiter. The main aim was to evaluate species and conditions of migration of these elements in natural waters from different water-bearing rocks in areas with a natural iodine deficiency. Evaluation of iodine and selenium species in aqueous solutions has been carried out by thermodynamic modeling basing on chemical composition of 81 water samples taken in the Bryansk region in the period of 2015-2017. The study has showed that the predominant species of iodine in the natural waters is iodide-ion (89%), which may also associate with typomorphic ions (Ca, Mg, Na, K, Sr) forming mineral complexes with them. In the latter state iodine may be removed from solution by fixation on a carbonate barrier. Selenium dominates in natural waters as hydroselenide ion (91%). In the presence of a significant amount of iron, this trace element may form the FeSe mineral phase which may be fixed in reduction conditions.

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Section: Iodinesupporting

confidence: 58%

Theoretical evaluation of iodine and selenium speciation in the natural waters of iodine-deficient territories

et al. 2019

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“…Thus, some Se-bearing rocks, such as marine shale, clay, phosphorite, basalt, and granite, are considered as the sources of high-selenium water (Fordyce et al, 2005). More importantly, the dynamic conditions governing Se transformation between water and rocks, such as pH, Eh, adsorption-desorption processes, biological interactions, complexing ability, and reaction kinetics have also been investigated (Korobova et al, 2014;Wu et al, 2014). The species of groundwater selenium are mainly the soluble and , has a higher solubility than .…”

Section: Discussionmentioning

confidence: 99%

“…Calcite can be the host phase influencing activity since the structural similarities between carbonate and selenite oxyanions facilitate the incorporation of amounts of to the bulk of calcite crystals (Roman-Ross et al, 2006). Lowest Se levels were also detected in water at territories with carbonate loesslike loams (Korobova et al, 2014). Several studies have concluded that Fe adsorbs and and removes them from the water environment (Selim and Sparks, 2001).…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have concluded that Fe adsorbs and and removes them from the water environment (Selim and Sparks, 2001). Korobova et al (2014) even concluded the hydroselenide formed FeSe and precipitated on the reduced barrier in the presence of significant Fe levels, and the elevated Se levels contain lower Fe levels in water. The Ca and Fe ions in the local groundwater show lower levels than those in supplied water (Table 1) probably resulting from the high pH caused by seawater intrusion, which is beneficial for groundwater selenium enrichment.…”

Section: Discussionmentioning

confidence: 99%

“…Selenium deficiency, together with other trace elements as Ca, Fe, Zn, Mn, Cr, has been listed as the possible causes of Kashin-Beck Disease and Keshan Disease although their etiology is till not clear (Ning et al, 2018). The low level in the dietary budget results in dysfunctions of the thyroid gland (Korobova et al, 2014). The excessive intake results in lameness, hair and fingernail loss, cirrhosis of liver, damage to the nervous and circulatory system, and even death (USEPA 2006).…”

Section: Introductionmentioning

confidence: 99%

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Groundwater Selenium Level and its Enrichment Dynamics in Seawater Intrusion Area along the Northern Coastal Zones of Shandong Province, China

et al. 2019

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The variation of groundwater properties caused by seawater intrusion, such as OH-, TDS, can potentially affect the groundwater Se levels. But there are no researches detailing the mechanism of groundwater selenium characteristics in seawater intrusion areas along coastal zones. Buzhuang town has been selected for study and groundwater is sampled to discuss the behavior of groundwater selenium with the intrusion of seawater. The groundwater Se levels range from 1.43 to 15.60 μg/L, with an average of 6.23 μg/L. All are within the limit of 10 μg/L except Wanglu village, but the local groundwater Se levels in 8 villages exceed the chronic criterion of 5 μg/L, and the Se levels in local groundwater are higher than those in the supplied water which has a non-seawater source. The groundwater Se levels have been shown to be elevated by seawater intrusion. The groundwater Se levels are positively correlated with Cl-, TDS, Br-, Na + , Mg 2+ , Ca 2+ and Fe and negatively correlated with pH. Ion competition effects and the Na-Mg-sulfate minerals play an important role in the adsorption and desorption for and , which are the important dynamic species for groundwater selenium enrichment. However, Ca and Fe ions have less contribution to groundwater Se variation because of the lower affinity for and and lesser content in groundwater of seawater intrusion areas.

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Selenium and drinking water quality indicators in Mongolia

Golubkina

Erdenetsogt²,

Tarmaeva

et al. 2018

Environ Sci Pollut Res

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Mongolia is characterized by restricted sources of drinking water and intensive water pollution due to high rates of urbanization, mining industry development, enormous amount of livestock, and ever-growing attempts in domestic production of cereals and vegetables. Among others, Se is the least studied element in Mongolian water resources. Based on fluorimetric method of analysis, the first results on Se levels in drinking water of five aimags, Ulaanbaatar, and Erdenet were obtained. Uneven distribution of Se in Mongolia was manifested, the highest Se concentrations being typical for the southern resources (up to 18,600 μg/L) and the lowest, for the Northern ones (up to 0.022 μg/L). ICP-MS data of Al, As, B, Ca, Cd, Co, Cr, Cu, Fe, Hg, I, K, Li, Mg, Mn, Na, Ni, P, Pb, Si, Sn, Sr, V, and Zn contents indicate poly-microelementosis existence in the South of Mongolia (Dorno-Gobi aimag) where ground water is characterized by elevated levels of As and extremely high levels of Se, Li, Na, F, Cl, B, and nitrates ions, exceeding maximum permissible levels by 1.86; 4.3; 3.1; 3.1; 2.7; 3.4; and 1.8 times respectively. Toxic concentrations of Se in groundwater of Dorno-Gobi aimag contradict with the published low human serum Se and low content of the element in horseflesh that suggests the possible effect of the above pollutants on Se bioavailability. Revealed phenomenon and mosaic distribution of heavy metals in areas with high and low Se content in water resources indicate the need of direct search for Se and other pollutant transfer in food chain in various ecological loading conditions, creation of a map of Se distribution in water resources of other Mongolian regions, and large-scale evaluation of the human poly-elemental status.

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Iodine and selenium speciation in natural waters and their concentrating at landscape-geochemical barriers

Cited by 10 publications

References 6 publications

Theoretical evaluation of iodine and selenium speciation in the natural waters of iodine-deficient territories

Theoretical evaluation of iodine and selenium speciation in the natural waters of iodine-deficient territories

Groundwater Selenium Level and its Enrichment Dynamics in Seawater Intrusion Area along the Northern Coastal Zones of Shandong Province, China

Selenium and drinking water quality indicators in Mongolia

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