Geochemical and sanitary-chemical characteristics of water springs of Bogorodsky and Losin-Petrovsky districts of the Moscow region.

Abstract

This paper is the results of evaluated of water parameters (COD, pH, electrical conductivity), the content of major ions (Ca²⁺, Mg2⁺, Na⁺, K⁺, NH₄ ⁺, HCO3^–, Cl^–, SO₄ ^2–, NO₃ ^–) and microelements (Co, Ni, Cu, Zn, Cd, Pb, Sr, Ba, Mn) for 12 springs in the Bogorodsky and Losino-Petrovsky districts of the Moscow region. The waters are slightly acidic-near-neutral (pH 5.5–7.5) with the mineralization from 0.07 to 0.5 g/l, the total hardness is 0.63–5.7 mg- eq/l, the composition of the water is variable. Spring waters are divided into four groups: Cl-SO₄-HCO₃-(Mg)-Ca; (SO₄)-HCO₃-Cl-Na-Ca; (Cl)-HCO₃-Ca; and mixed composition. Based on the thermodynamic calculation using the Visual-MINTEQ, it was found that the predominant dissolved forms of Ba, Sr, Mn, Zn, Cd, Ni, Co in the waters in the waters of the surveyed springs are free ions. For Cu and Pb, the factors for the formation of migration forms are the predominant anions of water, as well as the presence of organic matter in water. COD values and nitrogen compaund in the waters of individual springs are indicate that the formation of the composition of spring waters is associated with the infiltration of atmospheric precipitation through the modern sediments subject to antropogenic press. The values of other sanitary-chemical indicators (mineralization, pH, total hardness, chlorides, sulfates, mag- nesium, sodium, manganese), the content of standardized microelements are lower than their maximum permissible concentrations in drinking water.