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    Wyświetlanie 1-4 z 4
    Tytuł:
    Instrumental neutron activation analysis (INAA) for steel analysis and certification
    Autorzy:
    Polkowska-Motrenko, H.
    Chajduk, E.
    Danko, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/147648.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    steel analysis
    neutron activation analysis (NAA)
    proficiency testing/interlaboratory comparison (PT/ILC)
    certification of steel reference materials
    Opis:
    Instrumental neutron activation analysis (INAA) procedure of elemental steel analysis has been elaborated. The reliability of results obtained by the described procedure has been proved in the frame of different proficiency testing/interlaboratory comparison (PT/ILC) programmes, in which the Institute of Nuclear Chemistry and Technology (INCT, Warsaw) took part since 2005. This work summarizes participation of INCT in these exercises and demonstrates the usefulness of INAA to the certification of steel reference materials.
    Źródło:
    Nukleonika; 2011, 56, 4; 311-315
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of neutron activation for investigation of Fe3O4 nanoparticles accumulation by plants
    Autorzy:
    Bystrzejewska-Piotrowska, G.
    Asztemborska, M
    Stęborowski, R.
    Polkowska-Motrenko, H.
    Danko, B.
    Ryniewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146840.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    iron (II,III) oxide
    nanoparticles
    neutron activation
    plants
    Opis:
    As a result of the rapid development of nanotechnology and increasing application of nanoproducts in many areas of everyday life, there is a growing risk of production of nanowastes potentially dangerous for the environment. This makes it necessary to investigate the accumulation and toxicity of nanoparticles (NPs) at different trophic levels. In the studies neutron activation was applied for the investigation of iron (II,III) oxide nanoparticle (Fe3O4-NPs) accumulation by Lepidium sativum and Pisum sativum L. Plants were cultivated on growth medium contaminated with different concentrations (0.01-10 mmolźL-1) of Fe3O4-NPs. For the identification of the presence of Fe3O4-NPs in plant tissues gamma spectrometry following iron oxide (II,III) nanoparticles irradiation was applied. Both plant species were found to accumulate iron (II,III) oxide nanoparticles. The highest content of NPs was found in plant roots, reaching 40 g/kg for Pisum sativum L. More than 90% of accumulated NPs were found in roots. Accumulation of Fe3O4-NPs was found to depend on the concentration of nanostructures in the growth medium. The transfer factor for Lepidium sativum roots and shoots and Pisum sativum L. shoots decreased with increasing NP concentration in the medium; for Pisum sativum L. roots the tendency was reversed. Neutron activation of nanoparticles was shown to be a powerful tool for tracing the environmental fate of NPs and their uptake and accumulation in organisms.
    Źródło:
    Nukleonika; 2012, 57, 3; 427-430
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion exchange investigation for recovery of uranium from acidic pregnant leach solutions
    Autorzy:
    Danko, B.
    Dybczyński, R. S.
    Samczyński, Z.
    Gajda, D.
    Herdzik-Koniecko, I.
    Zakrzewska-Kołtuniewicz, G.
    Chajduk, E.
    Kulisa, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/147778.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    uranium recovery
    acidic pregnant leach solution
    ion exchange separation
    Opis:
    The article describes studies on the separation of uranium from acid pregnant leach solutions obtained from Polish uranium ores: dictyonema shales and sandstone rocks. Ion exchange chromatography was applied for uranium sorption, using commercially available, strongly basic anion exchanger, Dowex 1. In model experiments, the influence of degree of crosslinking of Dowex 1 on the efficiency of uranium extraction was investigated. The effect of H2SO4 concentration on the breakthrough curve of uranyl ions for the Dowex 1 resins, of different crosslinking: X4, X8 and X10, was examined. Unexpectedly high increase of exchange capacity of uranium was observed in case of Dowex 1X10. This gives potential opportunity of improving the effectiveness of uranium recovery process. Applying column packed with Dowex 1X10, ‘yellow cake’ with ca. 92% yield and high purity of recovered uranium was obtained. A block diagram of the procedure for uranium and lanthanides extraction from acidic leach liquor has been proposed.
    Źródło:
    Nukleonika; 2017, 62, 3; 213-221
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dictyonema black shale and Triassic sandstones as potential sources of uranium
    Autorzy:
    Kiegiel, K.
    Zakrzewska-Kołtuniewicz, G.
    Gajda, D.
    Miśkiewicz, A.
    Abramowska, A.
    Biełuszka, P.
    Danko, B.
    Chajduk, E.
    Wołkowicz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147500.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    uranium ores
    leaching
    extraction
    ion-exchange chromatography
    precipitation
    Opis:
    The main objective of the present study was an assessment of the possibility of uranium recovery from domestic resources in Poland. In the fi rst stage uranium was leached from the ground uranium ore by using acidic (sulfuric acid or hydrochloric acid) or alkaline (carbonate) solutions. The leaching efficiencies of uranium were dependent on the type of ore and it reached 81% for Dictyonemic shales and almost 100% for sandstones. The novel leaching routes, with the application of the helical membrane contactor equipped with rotating part were tested. The obtained postleaching solutions were concentrated and purifi ed using solvent extraction or ion exchange chromatography. New methods of solvent extraction, as well as hybrid processes for separation and purifi cation of the product, were studied. Extraction with the use of membrane capillary contactors that has many advantages above conventional methods was also proposed as an alternative purification method. The fi nal product U3O8 could be obtained by the precipitation of ‘yellow cake’, followed by calcination step. The results of precipitation of ammonium diuranate and uranium peroxide from diluted uranium solution were presented.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 515-522
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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