Prehliadanie podľa Autor "Kharbish, Sherif"

Teraz sa zobrazuje 1 - 3 z 3
  • Obrázok miniatúry
    Položka
    Assessment of Co, Cu, Zn, As and Cd bioavailability at selected European Cu-deposits, comparative environmental and geochemical study
    (North University of Baia Mare : Baia Mare, 2025) Ševčíková, Janka; Midula, Pavol; Spišiak, Ján; Kmeťová, Jarmila; Tomaškin, Ján; Kharbish, Sherif; Eldosouky Ahmed, Mohammed; Janštová, Jana; Turisová, Ingrid
    The article presents the results of a study of the contamination of heaps with potentially toxic elements, focused on Co, Cu, Zn, As, and Cd, their bioavailability in the area at selected European abandoned Cu-deposits: Špania Dolina (Slovakia), Libiola, Caporciano (Italy), and São Domingos (Portugal). The content of studied metals at selected heaps often exceeds the limits of national and EU legislation. The bioavailability was studied using three-step sequential extraction, using distilled water (step I), ammonium acetate (step II) and citric acid (step III). The best bioavailable elements are Cu, Cd, and Zn. Cobalt and As are less released during the leaching into the solution. The article discusses also the main environmental problems at the individual deposits and suggests possible solutions.
  • Obrázok miniatúry
    Položka
    Mapping of geological structures and sediment thickness from analysis of aeromagnetic data over the Obudu Basement Complex of Nigeria
    (Oxford University Press, 2024) Ekwok, Stephen Eguba; Eldosouky, Ahmed Mohammed; Thompson, Edward A.; Ojong, Romeo Akombi; George, Anthony M.; Alarifi, Saad S.; Kharbish, Sherif; Andráš, Peter; Akpan, Anthony E.
    In this study, geologic structures, as well as attendant orientations and sediment thickness, in the Nigerian Obudu Complex were delineated using the Centre for Exploration Targeting (CET), and depth determination methods such as source parameter imaging (SPI) and standard Euler deconvolution (SED). The CET, SPI, and SED procedures were applied on the total magnetic intensity data. Also, the enhanced TMI data using analytic signal, first-vertical derivative, total-horizontal derivative, and tilt-angle derivative filters were further subjected to CET operation, with the aim of mapping both subtle and prominent lineaments. In general, mapped geologic structures trends in the NE–SW, NNE–SSW, E–W, and N–S directions. Overall, the dominant geologic structural orientations of NE–SW and NNE–SSW reflect the regional strike orientation. The regional striking of the lineation, which is caused by the Pan-African orogeny and subsequent post-orogenic processes, has an impact on these orientations. The N–S and E–W structural deviations from the main NE–SW and NNE–SSW trends are initiated by the YGS of the post-orogenic events. Overall, these complex geologic structures are probable sites for metallogenic minerals.
  • Obrázok miniatúry
    Položka
    Pedochemical fractionation of potentially toxic elements within the context of soil-plant interactions at abandoned heap-field of Caporciano (Italy)
    (Springer Nature Switzerland AG : Cham, 2025) Andráš, Peter; Midula, Pavol; Kmeťová, Jarmila; Ševčíková, Janka; Tomaškin, Ján; Drímal, Marek; Janštová, Jana; Masný, Matej; Kharbish, Sherif
    Technosols from the heap of the abandoned Italian Cu deposit Caporciano contain important amounts of potentially toxic elements (Crtot., Co, Ni, Cu, Zn, As, Cd and Pb). Copper contents exceed the Italian law limits for industrial/commercial sites. The studied metals in Pinus sylvestris and Quercus petraea (Matt.) Liebl. show strategy of excluders (bioconcentration factor < 1.0) except Ni and Pb (calculated for branches and leaves in Pinus sylvestris) while the translocation factor indicates preferential metal accumulation to leaves/needles (translocation factor > 1.0) in both plant speciments.At the heap the contents of the chlorophyll in leaves in the photosynthetic tissues of Quercus petraea (Matt.) Liebl. (8.56 CCI—chlorophyll content index) are significantly lower as those measured at reference area (17.71 CCI). The goal of the study is to use a modified methodology for the fractional analysis of soils for the determination of the potential bioavailability of potentially toxic elements in six steps. The innovative steps of sequential analysis are adapted with respect to the release of PTEs from the clay mineral surfaces. (fraction I: 1 M ammonium acetate at pH 7; fraction II: ammonium acetate at pH 5; fraction III: H2O2 in ammonium acetate buffer solution; fraction IV: acidic 0.2 M ammonium oxalate (pH 3.2); fraction V: 0.2 M ammonium oxalate and 0.1 M ascorbic acid mixture; fraction VI: 0.5 M ammonium acetate; pH 6). The best bioavailable metals are Cd, Cu, Zn and Pb. The obtained results enable international comparison with similar Cu-deposits.