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    Wyświetlanie 1-2 z 2
    Tytuł:
    Surface-charging and particles aggregation behavior of ascharite
    Autorzy:
    Li, Zhihang
    Han, Yuexin
    Zuo, Kesheng
    Powiązania:
    https://bibliotekanauki.pl/articles/109441.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ascharite
    surface charge
    incongruent dissolution
    particles aggregation
    Opis:
    Surface charging and particles aggregation ascharite are investigated through Zeta potential measurement, XPS analysis, SEM analysis and dissolution experiments. The results show that more Mg2+ are removed from ascharite surface after dissolution, which confirms that incongruent dissolution of ions in the case of certain ionic substances like rmagnesium ions, hydroxyl groups and borate ions can lead to a net charge on surface. Isomorphous substitution of Fe3+ for Mg2+ is also regarded as one factor that causes surface charging behavior, which is in consistent with the experimental data. The dissolution process is analyzed to show more details about the dissolution reactions. The disparity in the bonding energy of B–O and Mg–OH surface groups and the difference in free energy of hydration of surface groups are considered to be the basic reason that lead to incongruent dissolution. Eventually, the effect of surface potential on particles aggregation is analyzed by DLVO theory, indicating that dissolution of ascharite has a detrimental effect on particles dispersion.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 4; 991-1001
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Weathering in a regolith on the Werenskioldbreen Glacier forefield (SW Spitsbergen). 2. Speciation of Fe, Mn, Pb, Cu and Zn in the chronosequence
    Autorzy:
    Rzepa, Grzegorz
    Manecki, Maciej
    Jakubski, Grzegorz
    Kwaśniak-Kominek, Monika
    Czerny, Jerzy
    Górniak, Dorota
    Powiązania:
    https://bibliotekanauki.pl/articles/191866.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    retreating glaciers
    incongruent dissolution
    sequential chemical extraction
    global warming
    Opis:
    The evolution of chemical speciation of Fe, Mn, Pb, Cu, and Zn was investigated in the chronosequence of young sediments, exposed by a currently retreating Arctic glacier on Spitsbergen. Werenskioldbreen is a 27 km2 subpolar, land-terminated, polythermal glacier in recession, located near the SW coast of West Spitsbergen. Three samples of structureless till were collected at locations exposed for 5, 45 and 70 years. Four grain-size fractions were separated: > 63, 20–63, 2–20, and < 2 µm. Speciation of Fe, Mn, Pb, Cu, and Zn was determined using a 6-step sequential chemical extraction method: 1) 1 M sodium acetate, 2) 1 M hydroxylamine hydrochloride in acetic acid, 3) sodium dithionite in buffer, 4) acid ammonium oxalate, 5) boiling HCl, 6) residuum. The weathering in the proglacial area of the retreating glacier is very fast. The geochemical fates of the metals in question correlate with each other, reflecting a) the geochemical similarities between them, b) the similarities of their primary mineral sources, c) the significant role of incongruent dissolution. The weathering processes dominating the system are redox reactions and incongruent dissolution, followed by precipitation of secondary phases and partial sorption of aqueous species. As a result, the elements released from weathering minerals are only partially transported away from the system. The remaining part transforms by weathering from the coarse-grained fraction (dominated by fragments of primary minerals) into the fine-grained fraction (in the form of secondary, authigenic minerals or as species sorbed onto a mineral skeleton). This is very strongly pronounced within the chronosequence: the content of each of the metals studied correlates identically with the grain size, despite the differences in their chemical character and affinities. The microscope study presented herein indicates that the role of incongruent dissolution previously was underestimated. Also, the formation of coatings of secondary phases on primary mineral surfaces was observed. All these rapid weathering processes affect the mineral speciation of initial soils as well as the composition of mineral suspensions transported away by rivers to the nearby ocean.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2019, 89, 3; 317-341
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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