The Main Factors of Uranium Accumulation in the Ishim Plain Saline Lakes (Western Siberia)     

Vladimirov  A. G.  Krivonogov  S. K.  Karpov  A. V.  Nikolaeva  I. V.  Razvorotneva  L. I.  Kolpakova  M. N.  Moroz  E. N. 《Doklady Earth Sciences》2018,479(2):511-517

Hydrochemical analysis of the high-salinity lakes in the Ishim Plain (>250–300 g/L) located at the border with the Northern Kazakhstan uranium ore province is performed. The studies have shown that the main factor of concentration and redistribution of uranium in the lake basins of the Ishim Plain are the processes of intense salt deflation causing sanding of lakes and uranium depletion in the near-surface layer of the bottom deposits. The correlation between the hydroxide forms of uranium binding in the bottom lacustrine deposits of the Ishim Plain and the coffinite composition of the Semizbai deposit makes it possible to consider this province to be promising for the discovery of hydromineral uranium deposits.

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Geochemical model of uranium accumulation in Shaazgai-Nuur Lake (Northwestern Mongolia)     

V. P. Isupov  S. Ariunbileg  L. I. Razvorotneva  N. Z. Lyakhov  S. L. Shvartsev  A. G. Vladimirov  M. N. Kolpakova  S. S. Shatskaya  L. E. Chupakhina  E. N. Moroz  L. V. Kuibida 《Doklady Earth Sciences》2013,448(1):143-148

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Observations on New Approaches for the Determination of Platinum-Group Elements, Gold and Silver in Different Geochemical Samples from Siberia and the Far East   总被引：1，自引：0，他引：1  

Valentina G. Tsimbalist  Gennady N. Anoshin  Valentin N. Mitkin  Ljudmila I. Razvorotneva  Nadezhda P. Golovanova 《Geostandards and Geoanalytical Research》2000,24(2):171-182

Some recent experiments on the determination of Au and the platinum-group elements (PGE) in geochemical samples are reviewed. Emphasis is given to the determination of ultra-low levels of PGE concentrations in resistant matrices, including chromites, molybdenites and ultrabasic ores. The problems and features of PGE determination in samples of various chemical composition are considered. For each sample type studied, a series of sample preparation techniques are proposed. These techniques included acid digestion, fusion with sodium peroxide, cold sintering with an oxidizing mixture of Na₂O₂+ Na₂CO₃ and also oxidizing fluorination with bromine trifluoride. A new approach for preparing geochemical material prior to digestion, based on mechano-chemical activation with simultaneous hyperfine grinding, is proposed and studied. The instrumental determination of PGE contents was carried out directly by AAS from extracted organic phases. It was found that a combination of digestion processes was required to achieve geochemical background levels of Au and PGE concentrations with the following detection limits: Pd, Rh - 1 ng g⁻¹, Pt, Ru - 10 ng g⁻¹, Au - 0.2 ng g⁻¹, Ag - 0.1 ng g^−1. The uncertainty in PGE and Au determination in geochemical samples is dependent on metal concentration, and also on their distribution in samples. The total analytical uncertainty of the proposed method is between 15-30%.  相似文献