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    Wyświetlanie 1-6 z 6
    Tytuł:
    Isotopic study of CO2 from industrial off-gases emission
    Autorzy:
    Wierzchnicki, R.
    Plewka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/148644.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    greenhouse gases
    stable isotopes
    CO2 anthropogenic emitters
    isotope ratio mass spectrometry
    Opis:
    The monitoring of greenhouse gases originating from different sources will be a crucial problem during this century. Experiments have been performed in order to obtain stable isotope composition of CO2 emitted by large industrial off-gas emitters. A special set for sample collection in field conditions was designed and tested. Two different methods of CO2 extraction were elaborated: vacuum extraction and extraction with carrier gas. Preliminary results of CO2 stable isotope composition emitted from an electric power plant during one working season are presented.
    Źródło:
    Nukleonika; 2010, 55, 2; 247-250
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stable isotope deuterium as a natural tracer of mixing processes in rivers
    Autorzy:
    Palige, J.
    Ptaszek, S.
    Zimnicki, R.
    Chmielewski, A. G.
    Wierzchnicki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146756.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    stable isotopes
    tracer
    deuterium
    oxygen-18
    river
    water flow
    Opis:
    The possibility of application of naturally existing differences in isotope contents 18O/16O, 2H/1H in waters for investigation of transport and mixing of various waters in the tributary-river system is presented. Experiments carried out on the Bug-Narew rivers-Zegrze Lake and the BugoNarew-Vistula rivers systems have indicated that the hydrogen isotope ratio 2H/1H can be used as an intrinsic tracer of natural mixing processes occurring in rivers. The IRMS methodology was used for isotope ratio measurement of water samples. The degrees of water mixing as a function of distance from the confluence point of rivers were determined. The obtained results indicate that in water systems where the natural differences in ?2H are higher than 5‰ this technique can replace the time-consuming and expensive dye (or radiotracer) dispersion tests for evaluation of pollutant transport in rivers.
    Źródło:
    Nukleonika; 2008, 53, 2; 63-67
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A study of stable isotope composition of chosen foodstuffs from the Polish market
    Autorzy:
    Malec-Czechowska, K.
    Wierzchnicki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/148152.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    stable isotope
    honey
    meat
    hen eggs
    food authenticity
    Opis:
    In the present work the carbon and nitrogen isotopic composition of food products bought in the retail trade in Warsaw is demonstrated. The research was carried out using meat (pork, chicken), hen eggs and honey. These products originated from the conventional and ecological farms. The values of the isotopic ratios are expressed as δ notation and correspond to the international standards (V-PDB for δ13C, and air for δ15N) according to the following general formula: δ(‰) = [(R sample / R standard) – 1] × 1000, where R represents the ratio between the less abundant and more abundant isotopes, in particular 13C/12C and 15N/14N. The results received in our laboratory, were compared with results presented in the literature for similar products. The results of the study show that the N and C stable isotope ratios in the tested products can be applied to verify their authenticity.
    Źródło:
    Nukleonika; 2013, 58, 2; 323-327
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of habitat conditions on chemical composition and content of isotopes in sea buckthorn (Hippophae rhamnoides L.) leaves
    Autorzy:
    Jaroszewska, A.
    Biel, W.
    Bojanowska-Czajka, A.
    Wierzchnicki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/11855251.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    The numerous publications on the positive impact of sea buckthorn and its products on human health concern mainly the fruits and seeds. However, there is little data relating to the properties of sea buckthorn leaves. The main objective of this study was to evaluate the chemical composition and isotope content in the leaves of sea buckthorn Hippophae rhamnoides L. depending on where its existence. The habitat conditions significantly differentiated the studies traits. Mean crude protein content in the leaves reached 235.0 g∙kg-1 d. m. The most proteins contain plants growing on native soil in the Dolna Odra Power Station. The ash content, fat, fiber and total carbohydrates was significantly higher in the leaves of sea buckthorn growing on sandy soil reclaimed from using ash from coal with NPK 60 – 70 – 70 + sludge. Their average concentration was: 49.2, 63.0, 128.1, 587.4 g∙kg-1 d. m., respectively. The concentration of micronutrients was varied and depended significantly from the place of living plants. A higher level of δ15N found in sea buckthorn grown on land reclaimed and fertilized with NPK. The conditions living of sea buckthorn didn’t differentiate δ13C value. It cannot be unequivocally determined whether the results of the study on the influence of habitat conditions on chemical and isotope composition of sea buckthorn leaves are permanent. Therefore, it is necessary to continue the research.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2017, 16, 1; 3-10
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sulfur isotope composition of selected Polish coals
    Autorzy:
    Chmielewski, A.
    Wierzchnicki, R.
    Derda, M.
    Mikołajczuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146980.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    coal
    coal extraction
    mass spectrometer
    sulfur isotope ratio
    Opis:
    Literature studies show that there are few data on sulfur isotope ratio in available the Polish coals. Elaboration of a method for the separation of sulfur from coal and measurement of sulfur isotope ratio of Polish coals is the scope of this work. The aim of the study was the preparation of coal samples and extraction of the particular form of sulfur. The stable compounds (Ag2S and BaSO4) were converted into sulfur dioxide. Sulfur isotope ratio in the gas phase was determined using a mass spectrometer. Samples were taken from selected Polish coal mines. Hard coal from Upper Silesia Basin, one sample from the Bogdanka coal-mine and one sample of lignite from the Be?chatow coal-mine.
    Źródło:
    Nukleonika; 2002, 47,suppl.1; 67-68
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sulfur isotope effects for the SO2(g)-SO2(aq) system
    Autorzy:
    Chmielewski, A.
    Derda, M.
    Wierzchnicki, R.
    Mikołajczuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146983.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    istotopic fractionation of SO2
    mass spectrometer
    sulfur isotope effect
    Opis:
    Sulfur isotope fractionation (34S/32S) factors were determined for the SO2(g)-SO2(aq) system. The influence of temperature on the investigated sulfur isotopes separation between phases was studied as well.
    Źródło:
    Nukleonika; 2002, 47,suppl.1; 69-70
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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