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  • 1
    Electronic Resource
    Electronic Resource
    Method for determination of gold in solutions with high oxidation/reduction potential (1996)
    Weinheim : Wiley-Blackwell
    Electroanalysis 8 (1996), S. 92-95 
    Details
    ISSN: 1040-0397
    Keywords: Gold ; Rock ; Stripping voltammetry ; Noble metals ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This article proposes a method for detecting the concentration of gold ions in solutions with high oxidation/reduction potential (ORP), such as aqua regia, a hypochlorite-iodine mixture, and a new proprietary liquid bromine carrier solution, by direct current anodic stripping voltammetry (DCASV). The working electrode is a graphite electrode impregnated with a mixture of epoxy resin and polyethylene amine. The article discusses: possible cause of a double stripping peak for gold appearing in voltammograms in aqua regia solution with electrolysis potentials less than -0.4 V; differences in coefficients of the working electrode's sensitivity in the above mentioned solutions. A relative standard deviation of the results in determining gold concentration in solutions of rock (ORP 〉 0.9 V), which were obtained by the proposed method and by atomic-absorption spectrophotometry, did not exceed 0.2.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140080118
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Stability of solutions of aromatic polyamides containing carborane units in the main chain (1995)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 196 (1995), S. 593-598 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The stability of aromatic polyamide chains containing 1,7-dicarba-closo-dodecaborane units was investigated in dilute solution by viscometry and sedimentation analysis at 25°C. Traces of impurities in dimethylformamide bring about degradation of the polymer and formation of polyanions, which become manifest in the viscosity by the polyelectrolyte effect. Neutral salts suppress this effect. Degradation is not hindered in an inert atmosphere. The solutions in N,N-dimethylacetamide and N-methyl-2-pyrrolidone are also unstable. No degradation occurs in solutions in tetrahydrofuran stabilized with 2,6-di-tert-butyl-4-methylphenol. Hence, reliable measurements of the molecular characteristics of this polymer can be carried out only in stabilized peroxide-free tetrahydrofuran.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1995.021960214
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  • 3
    Electronic Resource
    Electronic Resource
    Application of stripping voltammetry for the determination of mercury (1995)
    Weinheim : Wiley-Blackwell
    Electroanalysis 7 (1995), S. 264-269 
    Details
    ISSN: 1040-0397
    Keywords: Mercury ; Stripping voltammetry ; Natural waters ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method for detecting low concentrations of mercury ions with the help of direct current anodic stripping voltammetry (DCASV) is proposed. For this method, gold and gold-plated electrodes are used. To eliminate the influence of interfering organic surfactants, electrochemical method is used for the probe preparation. Less interference by inorganic substances is attained by the introduction of an additional state in the electrolysis at constant potential after pre-electrolysis, by which interfering elements are stripped from the deposit while mercury remains on the electrode. The lowest detection limit obtained was 0.16μg/L using a gold electrode and a graphite electrode impregnated with a mixture of an epoxy resin and polyethylenamine with a gold cover. The latter electrode can be used for fifty analyses without changing the gold covering. The proposed method was used for the analysis of food, sewage, and drinking water.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140070312
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  • 4
    Electronic Resource
    Electronic Resource
    The use of the reference element method for stripping voltammetric analysis of natural waters (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 549-554 
    Details
    ISSN: 1040-0397
    Keywords: Stripping voltammetry ; internal standard ; natural waters ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An internal standard method is proposed in the stripping analysis of natural waters. The method consists of the introduction into the sample solution of a reference element and subsequent calculation of the concentration of several elements by the increase in the analytical signal from the reference element. Criteria of the reference element selection are given. Calculated proportionality factors k obtained with the use of solutions simulating sea and river waters under the same experimental conditions can be applied to the determination of copper(II), lead(II), and cadmium(II) in natural waters. The use of the internal standard method allows one to substantially shorten the time of analysis (3-5 minutes instead of 30-50 minutes) and to improve accuracy and reproducibility of the analytical data.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040507
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  • 5
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    Dissipative solitons and vortices in polariton Bose-Einstein condensates (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-07-24
    Description: Author(s): Elena A. Ostrovskaya, Jasur Abdullaev, Anton S. Desyatnikov, Michael D. Fraser, and Yuri S. Kivshar We examine spatial localization and dynamical stability of Bose-Einstein condensates of exciton polaritons in microcavities under the condition of off-resonant spatially inhomogeneous optical pumping both with and without a harmonic trapping potential. We employ the open-dissipative Gross-Pitaevskii... [Phys. Rev. A 86, 013636] Published Mon Jul 23, 2012
    Keywords: Matter waves and collective properties of cold atoms and molecules
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Azimuthal vortex clusters in Bose-Einstein condensates (2012)
    American Physical Society (APS)
    Details
    Publication Date: 2012-01-18
    Description: Author(s): Volodymyr M. Lashkin, Anton S. Desyatnikov, Elena A. Ostrovskaya, and Yuri S. Kivshar We describe, analytically and numerically, topologically nontrivial stationary states with azimuthal modulation of density in a repulsive Bose-Einstein condensate (BEC) confined in a harmonic trap. We show that, depending on the number of density peaks and total topological charge, these states can ... [Phys. Rev. A 85, 013620] Published Tue Jan 17, 2012
    Keywords: Matter waves and collective properties of cold atoms and molecules
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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