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    Wyświetlanie 1-4 z 4
    Tytuł:
    The use of definitive methods based on radiochemical neutron activation analysis for the determination of selenium and arsenic in materials used in proficiency testing
    Autorzy:
    Chajduk, E.
    Polkowska-Motrenko, H.
    Dybczyński, R. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147273.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    selenium
    arsenic
    RNAA definitive methods
    proficiency testing
    Opis:
    This article describes the use of two definitive methods for the determination of Se and As traces in biological materials intended for proficiency testing. Radiochemical neutron activation analysis (RNAA) definitive methods are based on reactor neutron activation with a very selective and quantitative post-irradiation separation of the indicator radionuclide by column chromatography, followed by γ-ray spectrometric measurement. Each of these methods has detection limit of the order of ng·g–1 or better, and yields accurate results. The expanded standard uncertainty for both methods is ca. 4%. Definitive RNAA methods were used for establishing assigned values for Se and As in materials employed in proficiency testing of “Plants” series.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 49-54
    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:
    A study on chemical composition of Baszkówka and Mt. Tazerzait chondrites
    Autorzy:
    Dybczyński, R.
    Chwastowska, J.
    Danko, B.
    Kulisa, K.
    Polkowska-Motrenko, H.
    Samczyński, Z.
    Sterlińska, E.
    Szopa, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059297.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Baszkówka
    Tazerzait Mountains
    meteorites
    chondrites
    neutron activation analysis
    speciation
    cosmochemistry
    Opis:
    The elemental contents of two new meteorites, Baszkówka (Poland, 1994) and Mt.Tazerzait (Niger, 1991), were studied by instrumental and radiochemical neutron activation analysis (NAA), supplemented in the case of some elements by gravimetric, titrimetric, spectrophotometric and atomic absorption spectrometric measurements. In total 28 elements were determined for each meteorite. A striking similarity in the bulk chemical composition of the two meteorites was observed. In the case of Baszkówka some study of the elemental contents of the magnetic fraction and the distribution of elements between kamacite and taenite phases was also made. This study confirms that Baszkówka and Mt. Tazerzait are generally more similar to L chondrites than to any other class of chondrites. However both meteorites show also some distinctive features (e.g very low Hg content), distinguishing them from all other L chondrites known. Both meteorites may derive from a common parent body, which may be different from that typical for other chondrites.
    Źródło:
    Geological Quarterly; 2001, 45, 3; 289-302
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two new separation schemes for the group isolation of rare earth elements (REE) from biological and other matrices and their determination by ICP-MS, NAA and chromatographic methods
    Autorzy:
    Dybczyński, R. S.
    Samczyński, Z.
    Bartosiewicz, I.
    Kulisa, K.
    Polkowska-Motrenko, H.
    Pyszynska, M.
    Zuba, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/147581.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    rare earth elements
    REE
    lanthanides
    ion exchange chromatography
    NAA
    ICP-MS
    accuracy
    certified reference materials
    CRM
    Opis:
    Two new group separation schemes, based on ion exchange chromatography, for the selective and quantitative isolation of rare earth elements (REE) from accompanying elements, were devised. After checking their performance with the aid of radioactive tracers, the schemes were further used together with ICP-MS, NAA and ion exchange chromatography for the determination of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu in two certified reference materials (CRMs). The results were compared with another series of analyses, where the REEs were determined directly, i.e. without pre-separation, by instrumental neutron activation analysis (INAA) and inductively coupled plasma mass spectrometry (ICP-MS). It was demonstrated that while direct INAA and ICP-MS in most instances provide reliable results for the majority of REEs, for some elements, notably Sc, Yb and Tm in the cases of ICP-MS and INAA, respectively, systematic errors occur or may potentially occur.
    Źródło:
    Nukleonika; 2017, 62, 3; 199-211
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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