检索结果-南通市图书馆

A simple method to model the reduced environment of lake bottom sapropel formation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 2017年第4期35卷 956-966页

作者： olga L.gaskova Vera D.STRAKHOVENKO Nadezhda I.ERMOLAEVA Eugene Yu.ZARUBINA Ekaterina A.OVDINA V.S.Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of Sciences Novosibirsk State University Institute for Water and Environmental Problems Siberian Branch of the Russian Academy of Sciences

The Kambala and Barchin brackish lakes （Baraba steppe, southern West Siberia） contain an organic-rich sapropel layer that was formed in oxygen-depleted waters. We measured the bulk sediment elemental composition, the water chemistry and determined the mineralogical composition and predominant biota species （Diatoms and Cyanobacteria in phytoplankton community respectively） in the lakes. The result indicates that the first lake has a siliceous type of sapropel and the second a carbonaceous one. A computer thermodynamic model was developed for chemical interaction in water-bottom sediment systems of the Kambala and Barchin Lakes. The surface sodium bicarbonate waters are supersaturated with respect to calcite, magnesite （or low Mg-calcite）, quartz and chlorite with minor strontianite, apatite and goethite （pH 8.9-9.3, Eh 0.3 V）. Nevertheless, it is shown that during sapropel deposition, deep silt waters should be anoxic （Eh〈0 V）. The virtual component CH20 has been used to create an anoxic environment suitable for pyrite formation due to the biotic community impact and abiotic reduction. Thermodynamic calculation has shown that silt water is not necessarily euxinic （anoxic and sulfidic）. Depending on Eh, sulfate sulfur can dominate in solution, causing the formation of gypsum together with pyrite. An attempt was made to find a reason for solution supersaturation with respect to Ca and Mg ions due to their complexation with humic acids.

关键词： brackish lakes sapropel sediments mineral composition silica calcite thermodynamic calculations

Factors and mechanisms of chemical composition formation of saline lakes in West Mongolia

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2014年第S1期88卷 142-144页

作者： Marina KOLPAKOVA Stepan SHVARTSEV Vitalyi ISUPOV Sodov ARIUNBILEG Alexander VLADIMIROV olga gaskova National research Tomsk Polytechnic University Tomsk Department of the Trofimuk Institute of Petroleum-Gas Geology and Geophysics Siberian Branch of the Russian Academy of Sciences Academichesky ave Institute of Solid State Chemistry and Mechanochemistry Siberian Branch of Russian Academy of Sciences Novosibirsk 630128 Russia Institute of Geology and Mineral Resources Mongolian Academy of Sciences Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of Sciences Tomsk State University

All the lakes are accumulative systems for the various chemical ***,the ratios of the elements in different lake types are very *** is generally accepted that the composition of lake water determined by

关键词： saline lakes Mongolia system water-rock geochemistry evaporation

Thermodynamic Modeling of Uranium (VI) Reductive Immobilization in Groundwater of NPCC Sludge Storages (Novosibirsk, Russia)

在线全文

学校读者我要写书评

暂无评论

Journal of Geoscience and Environment Protection 2018年第11期6卷 181-189页

作者： olga L. gaskova A. E. Boguslavsky A. V. Safonov Sobolev Institute of Geology and Mineralogy SB RAS Novosibirsk Russia Novosibirsk State University Novosibirsk Russia Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences (IPCE RAS) Moscow Russia

The Biochemical Reduction Of Both Nitrate And Sulfate In U-Containing Aquifers Of The Novosibirsk Plant Of Chemical Concentrates (NPCC) Was Investigated Experimentally And Thermodynamically. It Was Observed That Decrease In Eh Up To -397 Mv Has A Distinct Effect On The Denitrification And Uranium Precipitation As UO2(S). Nitrate Was Denitrified With A Temporary Accumulation Of The Intermediate Nitrite On The Day 4th. According To The X-Ray Fluorescence Analysis And Thermodynamic Calculations, More Than Half Of The Uranium Is Deposited In The First Stage As UO2+X oxides, And The Rest, Together With The Sulfides In The Reducing Environment. Findings Suggest That Accurately Thermodynamic Predicting Of Groundwater NO3-;?And SO42- Fate Is Primarily Limited By Failing To Account For A Kinetic Of Redox Fluctuations In The Experiment: 1) Measured Eh +190 Mv Is Low Despite The High Amount Of Nitrates (1124 Mg/L), But NH4+ Predominates In Solution According To Calculations, 2) Sulfate Reduction Lagged Behind Nitrate Reduction By Approximately 50 Days Unlike Model Simulation.

关键词： Uranium Wastes Bacterialreduction Nitrogen Sulfur Thermodynamic Model

Physical-chemical modeling of oxidizing processes in high-sulfide mine tailings, and application to the Berikul site, Siberia

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2006年第B08期25卷 24-24页

作者： olga L. gaskova Svetlana B. Bortnikova Ivan V. Gaskov Institute of Geology and Mineralogy SB RAS