Prehliadanie podľa Autor "Midula, Pavol"

Teraz sa zobrazuje 1 - 6 z 6
  • 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
    Bioavailability of potentially toxic elements in selected Cu-deposits of Europe
    (Nitrianske Pravno Ústav geotechniky Slovenskej akadémie vied : Košice, 2024) Andráš, Peter; Midula, Pavol; Ševčíková, Janka; Šuránek, Matej; Matos João Manuel, Xavier; Janštová, Jana; Buccheri, Giuseppe; Tomaškin, Ján; Drímal, Marek
    Bioavailability of potentially toxic elements from four dump-field material at several abandoned European Cu-deposits: Špania Dolina (Slovakia), Caporciano and Libiola (Italy) and São Domingos (Portugal) was studied. The three steps sequential analyse study show some relation among geological setting and mineralogical composition of ores vs. bioavailability of metals. The best bioavailable metals at first three mentioned deposits are Cu and Cd (in one case, atr São Domingos As and Co). The results confirmed that the geological setting substantially influence the order of the bioavailability.
  • Obrázok miniatúry
    Položka
    Biodostupné formy potenciálne toxických prvkov v antropogénnej pôde odvalu rudného ložiska Cínovec
    (Štátny geologický ústav Dionýza Štúra Bratislava, 2024) Midula, Pavol; Svobodová, Sára; Andráš, Peter; Ševčíková, Janka; Tomaškin, Ján
  • 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.
  • Obrázok miniatúry
    Položka
    Polycyclic aromatic hydrocarbons formed during the pyrolysis process of plastics - characterization, quantification and risk assessment
    (Polish Society of Ecological Engineering : Varšava, 2024) Oravová, Lucie; Snow, Jan; Tolaszová, Jitka; Pilnaj, Dominik; Midula, Pavol; Ševčíková, Janka; Kuráň, Pavel
    Occurrence, distribution, and toxicity assessment of 16 Polycyclic Aromatic Hydrocarbons (PAHs) prioritized by the US Environmental Protection Agency in pyrolysis products – pyrolysis oil and pyrolysis wax – of different plastics are characterized. PP, HDPE, LDPE, PVC, PS (respectively, polypropylene, high- and low-density polyethylene, polyvinylchloride and polystyrene) and their mixture named 5P are chosen as a feed material for pyrolysis. Pyrolysis process is carried out in a custom-built laboratory batch reactor with the pyrolysis temperature of 450 °C for PP, PVC, PS and 500 °C for HDPE and LDPE. 5P mixture is pyrolyzed at 500 and 700 °C. PAHs quantification is used to determine the toxicity equivalency quantity TEQ(BaP) for each pyrolysis product and to establish the degree of toxicity. The highest total concentration of 16 PAHs in pyrolysis oil is found to decrease in the order of PVC > PP > PS > LDPE > HDPE. According to TEQ(BaP), the toxicity of the most toxic pyrolysis oils correlates with the aforementioned order of the total concentration, i.e., being lowest for HPDE and highest for PVC. For pyrolysis wax, the highest total concentration of 16 PAHs is for PVC > PS > LDPE > PP > HDPE, while TEQ(BaP) value decreases as PVC > LDPE > PP > PS > HDPE. The PAHs concentration and TEQ(BaP) values of 5P mixture show similar trends in both products (oil, wax), i.e., they both increase with increasing pyrolysis temperature.
  • Obrázok miniatúry
    Položka
    What does the waste say about the medieval town of Banská Bystrica (Central Slovakia) and its environment
    (Archeologický ústav AV ČR : Praha, 2025) Miňo, Martin; Styková, Barbora; Jarolímek, Ivan; Šibík, Jozef; Šibíková, Mária; Choma, Mojmír; Šimunková, Katarína; Látková, Michaela; Světlík, Ivo; Brabcová, Kateřina; Petrová, Markéta; Ďurica, Peter; Barta, Peter; Midula, Pavol; Ševčíková, Janka
    The historical town hall of Banská Bystrica was rebuilt in the second half of the 16th century from a medieval town mansion that had traditionally been owned by the town’s high-ranking citizens. As the building was an important structure, there is an extraordinary record of written sources depicting its history. However, there is almost no information before the year 1500 due to the fire that destroyed the town archives. Just as the fire obliterated the written record, modern construction activities severely damaged the archaeological record. The archaeological survey at the historical town hall of Banská Bystrica conducted between 2008 and 2009 could be considered a prime example of a rescue event. The small assemblage of artefacts dated shortly before and after the great fire was complemented by animal bones, water-preserved wooden planks, and archaeobotanical material. These finds underwent dendrochronological and radiocarbon dating, providing clues for assessing settlement continuity from the pre-colonisation period. By applying an interdisciplinary approach, which included the analysis of pottery, chemical analysis, DNA sampling, archaeobotanical and archaeozoological analysis, it became possible to reconstruct certain aspects of everyday life as well as the environment in the town and its surroundings.