Abstract
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.
Highlights
Iodine is an essential element for development and functioning of all mammals and humans in particular [1, 2]
The Bryansk region, which is endemic for the goiter, was the most affected by radioactive contamination as a result of the accident at the Chernobyl nuclear power plant in 1986
The purpose of this work was to peculiarities of water migration of iodine and selenium, in particular the speciation, in natural waters of different water-bearing sedimentary rocks to assess the contribution of mobile forms to the supply of these trace elements with drinking water
Summary
Iodine is an essential element for development and functioning of all mammals and humans in particular [1, 2]. Nowadays there is a large amount of data on the role of selenium in functioning of thyroid gland, i.e. secretion of its hormones [4, 5] and manifestations of Iodine Deficiency Disorders (IDD) [6, 7]. A number of studies have shown that chemical composition of water can play an important role in the development of IDD (mainly goiter) [9, 10]. The Bryansk region, which is endemic for the goiter, was the most affected by radioactive contamination (including iodine radioisotopes) as a result of the accident at the Chernobyl nuclear power plant in 1986. The accident at the Chernobyl Nuclear Power Plant led to a 2.7-fold increase in the incidence of thyroid pathology in this area [11]
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