Thermodynamic modeling in solving some issues of inland saline ecosystems

Olga L Gaskova,Vera D Strakhovenko,O Chudaev,R Harmon,R Millot,O Shouakar-Stash,Y Kharaka

doi:10.1051/e3sconf/20199805009

Olga L Gaskova, Vera D Strakhovenko + Show 5 more

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https://doi.org/10.1051/e3sconf/20199805009

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Abstract

The purpose of this work was to show some examples of using thermodynamic modeling to understand quantitatively the water-rock interaction processes in salt lakes systems. The systems of small lakes located compactly are convenient to comparative modeling, because this permits minimization of the number of variables in the model (the climatic, geomorphological and geological specifics, water balance in the same watershed area). Nevertheless, it turns out that each lake is a relatively autonomous system (natural biogeocenosis, formed as a result of diagenesis). Due to the conjugate processes of biogenic and inorganic interactions, they are in a steady state, which has been fixed during the geochemical sampling in the field.

Highlights

IntroductionThere is a need to describe the geochemical behavior of the saline systems (e.g., species of multicomponent aqueous systems and salt-solution equilibria) in order to provide keys of understanding the problems of climate change, the evolution of the environment, the conservation of natural resources
There is a need to describe the geochemical behavior of the saline systems in order to provide keys of understanding the problems of climate change, the evolution of the environment, the conservation of natural resources
The diatom cells incorporate skeletons composed of hydrated SiO2, so this lake contains siliceous type sapropel (34.1% SiO2 and 2.6% CaO)

Summary

Introduction

There is a need to describe the geochemical behavior of the saline systems (e.g., species of multicomponent aqueous systems and salt-solution equilibria) in order to provide keys of understanding the problems of climate change, the evolution of the environment, the conservation of natural resources. Along with the task of quantitative description of waterrock processes in the salt lakes systems, there is an inverse aspect of physicochemical modeling. Because of calculating the phase equilibria in the model system, we obtain the stability fields of all minerals whose thermodynamic potentials are included in the database. We can predict the physicochemical conditions for the formation of all solid phases, the formation of which is established during the modeling study [1]. The purpose of this work was to show some examples of using the results of thermodynamic modeling to solve the above-indicated questions. The systems of small lakes located compactly in the area are convenient to use as model natural objects

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