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  • 1
    Electronic Resource
    Electronic Resource
    Interaction of copper(II) ions with pyrite and its influence on ethyl xanthate adsorption (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 21 (1994), S. 526-536 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: X-ray photoelectron spectroscopy (XPS) has been used to investigate the interaction of copper(II)-containing aerated aqueous solution (pH 4-10) with pyrite (FeS2) surfaces and its influence on subsequent ethyl xanthate adsorption from solution. Evidence is provided that Cu(II) ions can be adsorbed independent of pH, changing their oxidation state to Cu(I). This is attributed to a new Cu-S surface species, In addition, Cu(II) can be stabilized as a complex hydroxy species on pyrite at pH ≥ 6. Time-dependent adsorption studies were carried out to elucidate the influence of pH on the copper adsorption rate, considering also the different copper oxidation states. A fast saturation of the sulphide surface with Cu(I) is observed at pH 5, whereas the Cu(I) uptake starts only slowly at pH 8 and pH 10. Prolonged conditioning in alkaline solution results in a precipitation of Cu(II) hydroxy species. Simultaneously, the amount of adsorbed Cu(I) increases until the same Cu(I) level is reached as in acidic media. After subsequent immersion in ethyl xanthate solution of pH 6-9, both Cu(I) and Cu(II) ions adsorbed on pyrite are found to form Cu(I) ethyl xanthate in accordance with previously published infrared spectroscopic and microflotation results.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740210804
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Zwei Vertreter des α-LiFeO2 Typs: LilnO2 und α-LiYbO2 [1, 2]Professor Hans-Georg von Schnering zum 60. Geburtstage gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 598 (1991), S. 129-138 
    Details
    ISSN: 0044-2313
    Keywords: Lithium indate(III) ; α-Lithium ytterbate(III) ; crystal structures ; MAPLE ; "split position" ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Two Representatives of the α-LiFeO2 Type: LiInO2 and α-LiYbO2Single crystals of LiInO2 (well ground mixtures of ‘In2O’: KO2: Li2O = 1:1.8:1, Ag-tube, 22d, 520°C); and α-LiYbO2 (Yb2O3:Li2O = 1:1.1, Ni-tube, 30d, 1150°C) were prepared for the first time from mixtures of the binary oxides. The determination of the structure confirmed the α-LiFeO2 type. Both oxides crystallize in the space group I 41/amd (Z = 4); LiInO2: a = 431.2(1) pm c = 934.2(2) pm; c/a = 2.167; 123 Io(hkl), R = 3.6%, Rw = 2.9%. α-LiYbO2:a = 438.7(1) pm c = 1006.7(2) pm; c/a = 2.295, 130 Io(hkl), R = 4.4%, Rw = 3.6%. The Madelung part of lattice energy, MAPLE and characteristics of this kind of structure are discussed.
    Notes: LiInO2 (aus innigen Gemengen von binären Oxiden, ‘In2O’: KO2:Li2O = 1:1, 8:1, Ag-Bombe, 22d, 520°C); sowie α-LiYbO2 (aus den binären Oxiden Yb2O3:Li2O = 1:1,1, Ni-Bombe, 30d, 1150°C) wurden erstmals als Einkristalle dargestellt. Die Strukturverfeinerung bestätigt den α-LiFeO2 Typ. Beide Oxide kristallisieren in der Raumgruppe I 41/amd (Z = 4); LiInO2: a = 431,2(1) pm c = 934,2(2) pm; c/a = 2,167;123 Io(hkl), R = 3,6%, Rw = 2,9%.α-LiYbO2:a = 438,6(1) pm c = 1006,7(2) pm; c/a = 2,295; 130 Io(hkl), R = 4,4%, Rw = 3,6%. Der Madelunganteil der Gitterenergie, MAPLE und Besonderheiten dieses Strukturtyps werden diskutiert.
    Additional Material: 12 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915980113
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  • 3
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    A quantitative analysis of stratospheric HCl, HNO3 and O3 in the tropopause region near the subtropical jet (2014)
    Wiley-Blackwell
    Details
    Publication Date: 2014-03-13
    Description: The effects of chemical two-way mixing on the Extratropical Transition Layer (ExTL) near the subtropical jet (STJ) is investigated by stratospheric tracer-tracer correlations. To this end, in-situ measurements were performed west of Africa (25- 32°N) during the TACTS/ESMVal mission in August/September 2012. The Atmospheric chemical Ionization Mass Spectrometer AIMS sampling HCl and HNO 3 was for the first time deployed on the new German High Altitude and LOng range research aircraft HALO. Measurements of O 3 , CO, ECMWF analysis and the tight correlation of the unambiguous tracer HCl to O 3 and HNO 3 in the lower stratosphere were used to quantify the stratospheric content of these species in the ExTL. With increasing distance from the tropopause the stratospheric content increased from 10% to 100% with differing profiles for HNO 3 and O 3 . Tropospheric fractions of 20% HNO 3 and 40% O 3 were detected up to a distance of 30 K above the tropopause.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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  • 4
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    Depletion of ozone and reservoir species of chlorine and nitrogen oxide in the lower Antarctic polar vortex measured from aircraft (2017)
    Wiley-Blackwell
    Details
    Publication Date: 2017-05-24
    Description: Novel airborne in-situ measurements of inorganic chlorine, nitrogen oxide species and ozone were performed inside the lower Antarctic polar vortex and at its edge in September 2012. We focus on one flight during the TACTS/ESMVal campaign with the German research aircraft HALO, reaching latitudes of 65° S and potential temperatures up to 405 K. Using the early-winter correlations of reactive trace gases with N 2 O from ACE-FTS, we find high depletion of chlorine reservoir gases up to ∼ 40 % (0.8 ppbv) at 12 km to 14 km altitude in the vortex and 0.4 ppbv at the edge in subsided stratospheric air with mean ages up to 4.5 years. We observe denitrification of up to 4 ppbv, while ozone was depleted by 1.2 ppmv at potential temperatures as low as 380 K. The advanced instrumentation aboard HALO enables high resolution measurements with implications for the oxidation capacity of the lowermost stratosphere.
    Print ISSN: 0094-8276
    Electronic ISSN: 1944-8007
    Topics: Geosciences , Physics
    Published by Wiley-Blackwell on behalf of American Geophysical Union (AGU).
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