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Διερεύνηση κατανομής σεληνίου σε ιστορικά καταγεγραμμένες ιαματικές πηγές της Δυτικής Κρήτης

Martsakis Rafail

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Summary

In this paper are studied the geological and hydrochemical data of historically recorded thermal springs of Crete, which contain selenium. Starting from a brief reference to the chemistry of selenium, its redox properties, its compounds and also reference is made to its origin and distribution in minerals, rocks, soil and water. The presence of selenium is usually associated with sulfur, which replaces in sulfide metals minerals, and therefore the relationship between the two elements is of great importance. According to the extensive literature, selenium is very important for human health but also very harmful in overdose. Also are listed illustrative diagrams and the chemical analyzes of main elements and trace elements from water samples of historically recorded thermal springs of Crete (of Chania, Rethymno and Heraklion). The results were compared with the limits set in the European Union directives of specific elements and indications for the labeling of natural mineral water constituents. In addition, was made a comparison of the measurements of the main elements as well as the trace elements measured in the field with the limits that have been set and above them the waters are not suitable for daily use according to the data of the Government Gazette (3282/19/10/2017) "on the quality of water for human consumption" and Article 1 of Directive 98/83 / EC. From the citation of the physicochemical parameters of the studied waters, among others, it emerged that the studied springs are characterized from cold to hypothermic (13.5-26 oC), in relation to the pH from acidic to alkaline (2.8-8.4) and in relation to the (TDS) springs are classified from oligometallic to low salt according to Annex A (50-480 mg/L), with a few exceptions where the springs are at the lower limits of metal springs (520-580 mg /L). Regarding the selenium content, the highest selenium content in springs in the prefecture of Chania was measured at the spring of Agios Antonios with a value of 47.9 μg/L and the lowest detectable in the spring of Lisos with a value of 0.1 μg / L, in the prefecture of Heraklion the highest content was measured at the spring / drilling in Lenta with a value of 116.9 μg/L and the smallest detectable at the spring of Krotos with a value of 1.3 μg/L and in the prefecture of Rethymno the highest content was measured at the spring of Kastellos with a value of 0.6 μg/L and the smallest detectable at the spring of Arolithi with a value of 0.1 μg/L. The interpretation of the distribution of these values was based on the study of the geological background of the areas that host the aquifers discharged by the studied springs.

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