"WATER-GRANITE" SYSTEM: TIME OF FORMATION OF FRESHWATER COMPOSITIONстатья
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Дата последнего поиска статьи во внешних источниках: 23 сентября 2021 г.
Аннотация:The relevance of the research is caused by the necessity to evaluate the changes in groundwater chemical composition due to water-rock interaction. Usually the source of water, the H2O molecules namely, and the source of dissolved components are considered separately. In the study the atmosphere precipitates is the source of H2O. As water is used for different purposes (potable water supply, industrial water supply), it must correspond to the specified water use standards. Water quality depends on it features and composition. Water chemical composition depends, on its turn, on the structure of rock at interaction, interaction time and contact with atmosphere. The main aim of the study is to determine granite alteration and age of potable water chemical composition formation due to granite meteoritic water interaction. Methods of research: thermodynamic simulation of water-rock interaction using HCh code developed by Yu.V. Shvarov. The equilibrium state algorithm is based on Gibbs free energy minimization and on chemical reactions system solution. The results. It is shown that in the "water-granite" system, open in respect to O-2 and CO2, the Na-HCO3 composition of potable water forms during 3000 years. The aqueous solution pH value, which resulted from water-rock interaction, increases up to 7,8 but aqueous solution Eh value decreases from 0,79 to 0,62 V. The aqueous calcium concentration is limited by secondary minerals formation and deposition: dolomite and apatite.