Reduced forms of sulfur in the brine of Saline–Soda Lake Doroninskoe,eastern Transbaikal Region

Contents of inorganic reduced forms of sulfur were determined in the oxygen-bearing waters of saline-soda Lake Doroninskoe. The vertical and annual distributions of individual species and total reduced sulfur have been studied. It was found that oxic zone ubiquitously contains reduced sulfur with contents: HS⁻ 0.002–3.86 mg/l, S⁰ 0.002–0.129 mg/l, S^{0; 4+} 0.014–9.19 mg/l. Oxygen concentrations varied from 0 to 6.8 mg/l. These sulfur compounds show unsystematic vertical distribution, which during transitional season is controlled by intensity of bacterial processes.     

Basic formation mechanisms of Lake Doroninskoye soda water,East Siberia,Russia

The primary scientific goal of studying salt lakes is to better understand the formation of small continental-type hydrogeochemical systems. Many scientists have attributed the metamorphism of the chemical composition of salt lakes to the evaporative concentration of water. However, the formation of soda water is inconsistent with this hypothesis. Thus, analyzing intrabasinal biochemical processes and water—rocks interactions during the evaporative concentration of water allows us to understand the major mechanisms of the formation and evolution of water compositions. Therefore, the aim of this paper is to identify the key processes involved in the formation of the chemical composition of the water in Lake Doroninskoye. An analysis of the distribution of major components shows that Na⁺, HCO₃ ^?, CO₃ ^2?, and Cl^? are dominant in this water. High concentrations of these elements are the result of evaporative water concentration. Calcium, magnesium, and potassium are not accumulated because the water is saturated in minerals containing these elements. The main barrier to the growth of the sulfate content of water is sulfate reduction. This process also contributes to the additional reproduction of carbon dioxide, which reacts with the products of the hydrolysis of aluminosilicates OH^? to form HCO₃ ^? and CO₃ ^2?, thus further contributing to the natural processes of soda formation.     

Hydrochemical regime of saline lakes in the Southeastern Transbaikalia

Results from hydrochemical investigations into macrocomponent composition of some of the lakes in the Southeastern Transbaikalia are presented. The region's saline lakes, as a rule, are soda-chloride or chloride-soda lakes according to their chemical composition. The lakes hydrochemistry is determined by a combination of evaporative concentration of salt composition, intra-water body hydrobiological processes, especially by the production of organic matter and reduction of sulfates as well as by hydrogenic sedimentation.     

Elemental sulfur in the brine of Lake Doroninskoe (Eastern Transbaikalia)

The concentration of elemental sulfur (S⁰) in the upper oxic layer of the meromictic (stratified by water mineralization) soda Lake Doroninskoe (about 5.5 m depth) varied in the survey periods from the detection limit (0.002 mg/l) to the registered maximum of 0.444 mg/l, with an average value of 0.12 mg/l. In the lower hydrosulfide layer, these concentrations amounted to 0.012–1.88 mg/l. The results obtained point to the processes of sulfide sulfur oxidation under reductive conditions, and of sulfate reduction to form hydrogen sulfide in the oxic medium. The dynamics of the seasonal S⁰-thiosulfate ratio testifies to the dual (oxidative and reductive) nature of the latter.     

Hydrochemistry of the Ivano-Arakhleiskie Lakes in Different Climate Phases

Water Resources - Data of hydrogeochemical studies of the Ivano-Arakhleiskie Lakes have been collected for different climatic phases of territory moistening. Three groups of water bodies are...     

Hydrochemistry of rivers along the route of projected Western Siberia-Pacific Ocean Oil Pipeline in the Vitim-Olekma interfluve

More than 30 hydrochemical indices for 17 rivers are characterized based on the results of a study carried out in July 2005. The values of MPCs are found to be exceeded for Fe, Mn, and suspended matter, the concentrations of which, as well as other analyzed components, are controlled by natural processes.     

Uranium in the mineralized lakes of Altai Krai

Data on the physicochemical properties (pH, Eh, salinity) and content of U and other trace elements (As, Li, B, Br, I, Sr) are provided for the mineralized lakes of the Kulundinskaya steppe of Altai Krai. The sodic lakes of the region are characterized by higher U²³⁸ contents (up to 4 mg/l). The U contents in the lake waters are positively correlated with the sum of carbonate and hydrocarbonate ions and the pH of waters and are negatively correlated with salinity. These data confirm the presence of an economic U-bearing zone of the ground reservoir oxidation located along the eastern slope of the Platovskoe uplift in the northwestern direction along the boundary with Kazakhstan.