Abstract
In the central part of Western Siberia a study of the chemical composition of fresh underground waters in the upper 600 m of the Sredneobskoy artesian basin was carried out. It was shown that underground waters generally contain high concentrations of strontium. The minimum concentrations of Sr are typical for Neogene-Quaternary sediments (600 µg/L), maximum values in the waters of the Upper Cretaceous sediments (more than 1300 µg/L). The study of strontium accumulation mechanisms in drinking underground waters is undoubtedly an important issue, as strontium is a biologically active element. Especially dangerous is the consumption of underground waters with a calcium-strontium ratio less than 100, that is the hydrogeochemical precondition for Urov endemic (Kashin-Beck disease). According to the calcium/strontium ratios data waters of the Neogene-Quaternary and Paleogene sediments selected in the south-western part of the Tomsk region are unsuitable for drinking water supply. Underground waters are shown to be in equilibrium with Al and Fe hydroxides; Ca, Mg, Fe carbonates; and clay minerals, including ferruginous. Increased strontium content in aquifers is determined not only by the chemical composition of the water-bearing rocks, but also increasing resident time of water rock interaction.
Highlights
Groundwater is the main source of drinking water supply in the Tomsk region
Dangerous is the consumption of underground waters with a calciumstrontium ratio less than 100, that is the hydrogeochemical precondition for Urov endemic (Kashin-Beck disease)
According to the calcium/strontium ratios data waters of the Neogene-Quaternary and Paleogene sediments selected in the south-western part of the Tomsk region are unsuitable for drinking water supply
Summary
Groundwater is the main source of drinking water supply in the Tomsk region. Groundwater of this region is rather effectively protected from surface contamination by low permeability argillaceous deposits. The Tomsk region is located in the southeast part of the Sredneobsky artesian basin which is characterized by huge resources of underground waters. Using these waters are complicated because they have the high concentrations of iron [1] reaching several tens mg/L. In this regard, it is important to study the prevalence and conditions of strontium accumulation in the groundwater of the active water exchange zone used for drinking water supply of the Tomsk region
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