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    Wyświetlanie 1-7 z 7
    Tytuł:
    Datowanie metamorfizmu z początku Układu Słonecznego: wiek U-Pb apatytu z meteorytu Leoncin (chondryt zwyczajny LL5-6 o charakterze brekcji monomiktycznej)
    U-Pb age of the early Solar System metamorphism by using apatite from the Leoncin meteorite (LL5-6 ordinary chondrites – monomictic breccia)
    Autorzy:
    Szopa, Krzysztof
    Karwowski, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1830279.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    LA-ICP-MS
    Leoncin
    SEM
    formation ages
    meteorites
    Opis:
    The U-Pb system is a useful chronometer for understanding the formation history of chondritic materials. Modern studies showed that the formation ages of chondrites (4.55–4.56 Ga) effectively equal the formation age of the solar system. Recently, researchers have undertaken U-Pb isotopic studies of phosphates separated from equilibrated ordinary chondrites, which are the major hosts for U and are enriched by an order of magnitude or more relative to the bulk rock (typical U concentrations of 0.1–3 ppm in phosphates). The observed Pb-Pb model ages for these phosphates range from 4.563–4.502 Ga, with an analytical precision of 1 Ma and the U-Pb system is apparently concordant. They also argued that the Pb-Pb ages of the phosphates from several H chondrites show a negative correlation with metamorphic grade. They concluded that thermal processing of the equilibrated chondrites took place over a 60 Ma interval and grain size of the phosphates increases with the degree of metamorphism. In the Leoncin meteorite, apatite reveal the 207Pb/206Pb age, which is 4549±61 Ma. The obtained apatite age in the Leoncin meteorite reflects the early solar system formation process. Moreover, the age is an example of the early solar system metamorphism, which confirms a slightly younger event of secondary changes of the parent body for this meteorite. It is also the first isotopic age of a Polish meteorite.
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2021, 12; 85-91
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie spektrometrii mas z jonizacją w plazmie indukcyjnie sprzężonej z mikropróbkowaniem laserowym do oznaczania składu pierwiastkowego pyłów
    Application of laser ablation inductively coupled plasma mass spectrometry in determinations of elemental composition of powders
    Autorzy:
    Pakieła, M.
    Wojciechowski, W.
    Bulska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074722.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    LA-ICP-MS
    badanie laserowe próbek
    pyły
    laser microsampling
    powders
    Opis:
    In laser ablation (LA) a very little amount of solid material is transferred to the gas phase followed by its transport to the source of excitation. The coupling of laser ablation with inductively coupled plasma (ICP) and mass analyzer (MS) allows direct determination of elemental composition of solids. In the case of congested solid samples, LA ICPMS makes possible analysis of element distribution in surface and sub-surface domains of a sample. Unfortunately, not all solid substances appear in congested form as sometimes an analyst receives solid samples in a form of powder. The number of papers related to the possibilities of quantitative analysis of disintegrated samples has been increasing during last years. However, direct analysis of powders, such as soils, sediments or dust, is not possible. Thus the initial step in preparation of such samples is their immobilization in support base, which enables analysis of material of interest without changing sample properties. In this article the possibilities of analysis of immobilized powder samples using ablation process are presented. Homogeneity of powder deposition, purity of material and quality of the ablation process are important parameters and may be used as criteria. Correctness of material selection has to be always confirmed with chosen reference materials. The procedure allowing uniform and reproducible immobilisation of bottom sediment as well as a calibration measurement system with the use of external standards with similar matrix as samples are presented.
    Źródło:
    Przegląd Geologiczny; 2009, 57, 12; 1084-1089
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of LA-ICP-MS as an auxiliary tool to assess the pulmonary toxicity of molybdenum(IV) sulfide (MoS2) nano- and microparticles
    Autorzy:
    Kuraś, Renata
    Stępnik, Maciej
    Domeradzka-Gajda, Katarzyna
    Janasik, Beata
    Powiązania:
    https://bibliotekanauki.pl/articles/28761978.pdf
    Data publikacji:
    2024-03-05
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    microparticles
    LA-ICP-MS
    molybdenum(IV) disulfide
    bioimaging
    rat tissues
    nanoparticles
    Opis:
    Objectives Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) has considerable applicative potential for both qualitative and quantitative analyses of elemental spatial distribution and concentration. It provides high resolutions at pg-level detection limits. These qualities make it very useful for analyzing biological samples. The present study responds to the growing demand for adequate analytical methods which would allow to assess the distribution of nanostructured molybdenum(IV) disulfide (MoS₂) in organs. It was also motivated by an apparent lack of literature on the biological effects of MoS₂ in living organisms. The study was aimed at using LA-ICP-MS for comparing micro- and nanosized MoS2 ditribution in selected rat tissue samples (lung, liver, brain and spleen tissues) after the intratracheal instillation (7 administrations) of MoS₂ nano- and microparticles vs. controls. Material and Methods The experimental study, approved by the Ethics Committee for Animal Experiments was performed using albino Wistar rats. This was performed at 2-week intervals at a dose of 5 mg/kg b.w., followed by an analysis after 90 days of exposure. The MoS₂ levels in control tissues were determined with the laser ablation system at optimized operating conditions. The parameter optimization process for the LA system was conducted using The National Institute of Standards and Technology (NIST) glass standard reference materials. Results Instrument parameters were optimized. The study found that molybdenum (Mo) levels in the lungs of microparticle-exposed rats were higher compared to nanoparticle-exposed rats. The opposite results were found for liver and spleen tissues. Brain Mo concentrations were below the detection limit. Conclusions The LA-ICP-MS technique may be used as an important tool for visualizing the distribution of Mo on the surface of soft samples through quantitative and qualitative elemental mapping.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2024, 37, 1; 18-33
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Clara cells protein, prolactin and transcription factors of protein NF-ĸB and c-Jun/AP-1 levels in rats inhaled to stainless steel welding dust and its soluble form
    Autorzy:
    Hałatek, Tadeusz
    Stanisławska, Magdalena
    Świercz, Radosław
    Domeradzka-Gajda, Katarzyna
    Kuraś, Renata
    Wąsowicz, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2162014.pdf
    Data publikacji:
    2018-10-23
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    prolactin
    stainless welding
    Clara cells protein
    NF-kB
    c-Jun/AP-1
    LA-ICP-MS
    Opis:
    Objectives Welding processes that generate fumes containing toxic metals, such as hexavalent chromium (Cr(VI)), manganese, and nickel (Ni), have been implicated in lung injury, inflammation, and lung tumor promotion in animal models. Bronchiolar epithelium Clara cells/club cells, coordinate these inflammatory responses. Clara cells secretory protein (CC16) with ant-inflammatory role. Material and Methods The pulmonary toxicity of welding dust (WD) was assessed for Wistar rats exposed to 60 mg/m³ of respirable-size welding dust (mean diameter 1.17 μm for 1 and 2 weeks (6 h/day, 5 days/week)) or the aerosols of soluble form (SWD) in the nose-only exposure chambers. Additionally the effect of antiinflammatory betaine supplementation was assessed. Clara cells secretory protein, differential cell counts, total protein concentrations and cellular enzyme (lactate dehydrogenase – LDH) activities were determined in bronchoalveolar lavage fluid, and corticosterone and thiobarbituric acid reactive substances (TBARS) and prolactin concentrations were assessed in serum. Histopathology examination of lung, brain, liver, kidney, spleen was done. Additionally slices of brain and lung were exanimated in laser ablation inductively coupled plasma mass spectrometry. Results Both WD and SWD exposure evoked large bronchiolar infiltration shoved in histopathology examination. In this study, TBARS inversely correlated with a significant decrease of CC16 concentration that occurred after instillation of both WD and SWD indicating decreased anti- inflammatory potential in the lung. In WD exposed rats prolactin correlated with nuclear factor-kappa B (NF-κB), LDH, TBARS and serum levels Cr, Ni and inversely with c-Jun. In SWD exposed rats prolactin correlated with CC16 indicated effect of prolactin on the population of epithelial cells. Conclusions In the current study, deleterious effects of repeated inhalation stainless steel welding dust form on club (Clara) cell secretory protein (CC16) were demonstrated. Clara cells secretory protein relation with prolactin in exposed rats to welding dust were shown and explored whether the NF-κB and c-Jun/activator protein 1 related pathway was involved. Int J Occup Med Environ Health 2018;31(5):613–632
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2018, 31, 5; 613-632
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza składu chemicznego szkieł średniowiecznych trzech witraży z klasztoru oo. Dominikanów w Krakowie
    Chemical composition analysis of medieval glass of three stained-glass windows from the Dominican Monastery in Kraków
    Autorzy:
    Bernady, E.
    Walczak, M.
    Wilk, D.
    Bulska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/167845.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Ceramiki i Materiałów Budowlanych
    Tematy:
    szkło średniowieczne
    witraż
    MA-XRF
    SEMEDS
    LA-ICP-MS
    Medieval glass
    stained-glass
    SEM-EDS
    Opis:
    Trzy piętnastowieczne witraże z klasztoru OO. Dominikanów w Krakowie: Tron Łaski, Maria ze sceny Zwiastowania i Chrystus z aniołem ze sceny Koronacji Marii były przedmiotem analiz technologii oraz stanu zachowania. W celu wyznaczenia składu chemicznego szkieł zastosowano trzy techniki analityczne: MA-XRF (makro-skaning fluorescencji rentgenowskiej), SEM-EDS (skaningowa mikroskopia elektronowa z mikroanalizatorem fluorescencji rentgenowskiej) i LA-ICP-MS (spektrometria mas z jonizacją próbki w plazmie indukcyjnie sprzężonej po ablacji laserowej). Na podstawie zawartości głównych składników szkłotwórczych oraz niektórych pierwiastków śladowych możliwa była identyfikacja szkieł w witrażach wykonanych przez ten sam warsztat. Badane szkła wykazały podobieństwa w zakresie zawartości krzemionki oraz proporcji tlenku potasu do tlenku wapnia.
    Three 15th century stained-glass panels The Throne of Grace, the Virgin Mary at the Annunciation and Christ and an Angel at the Coronation of the Virgin from the Dominican Monastery in Kraków were subjects of physicochemical analyses. MAXRF (macro X-ray fluorescence scanning), SEM-EDS (scanning electron microscope equipped with energy-dispersive X-ray spectrometry) and LA-ICP-MS (laser ablation inductively coupled plasma mass spectrometry) were utilized for determination of chemical composition of glass panes. Establishing of basic composition and analysis of trace elements allowed to compare panels, which are considered as made by the same stained-glass workshop. Analyses revealed similarities in the amount of silica and relation of potassium oxide to calcium oxide between glass panes.
    Źródło:
    Szkło i Ceramika; 2018, R. 69, nr 5, 5; 18-22
    0039-8144
    Pojawia się w:
    Szkło i Ceramika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza rozmieszczenia pierwiastków w badaniach archeometrycznych z zastosowaniem mikropróbkowania laserowego w spektrometrii mas z jonizacją w plazmie indukcyjnie sprzężonej
    Elemental distribution in archaeometric studies with the use of micro-destructive laser ablation inductively coupled plasma mass spectrometry
    Autorzy:
    Kępa, L.
    Then-Obłuska, J.
    Otmianowska, M.
    Wagner, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/172803.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    LA-ICP-MS
    spektrometria mas z jonizacją w plazmie indukcyjnie sprzężonej
    archeometria
    obiekty zabytkowe
    Inductively Coupled Plasma Mass Spectrometry
    archaeometry
    cultural heritage objects
    Opis:
    Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) is one of modern instrumental methods, which use in elemental analysis of cultural heritage objects has recently noticeably increased. The method requires almost no sample preparation and permits direct analysis of solid samples, availing only minute amount of the material. The micro-destructiveness of ablation processes remains usually within the scale acceptable for art historians, conservators, archaeologists and art curators, therefore the capability to perform multi-elemental, ultra trace and isotopic analysis can be fully used during studies of cultural heritage objects. The lack of appropriate matrix-matched certified reference materials and the fractionation effects, which may influence the final quantitative results to a different extent, are widely reported among the main limitations of LA-ICP-MS. Despite these constrains, LA-ICP-MS is a method that can be flexibly tuned to collect the desired elemental information about various cultural heritage objects. This paper focuses on advantages of using LA-ICP-MS in analysis of heterogeneous objects in respect of mapping of elemental distribution either during the onepoint or multi-line ablation executed directly from the surface of the investigated objects. The use of LA-ICP-MS allowed collection of chemical information availing reconstruction of distribution patterns, which reflected important structural characteristic of the small gilded decoration produced in mediaeval times (collection of Gallery of Medieval Art, the National Museum in Warsaw) and archaeological “metal-in-glass”/“sandwich” bead (Nubian collection, the Museum of Archaeology University of Stavanger, Norway). The mediaeval decoration was identified as the gilded (Ag+Au) copper object, which due to corrosion and re-painting has lost their original appearance. The bead was produced from two various types of glass and a metal foil (Ag+Au+Cu) between them. In both cases LA-ICP-MS was used successfully to determine the main elemental composition and to collect information about elemental distribution in the investigated artifact.
    Źródło:
    Wiadomości Chemiczne; 2015, 69, 9-10; 719-733
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital Concentration-Distribution Models - tools for a describing heterogeneity of the hybridized magmatic mass as reflected in elemental concentration of growing crystal
    Autorzy:
    Śmigielski, M.
    Słaby, E.
    Domonik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/138808.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cyfrowe stężenia dystrybucji modeli
    mieszanie magmy
    model cyfrowy
    raster
    wzrost kryształów
    crystal growth
    DC-DM
    EMPA
    LA-ICP-MS
    magma mixing
    Raster digital model
    Opis:
    Raster digital models (digital concentration-distribution models - DC-DMs) as interpolations of geochemical data are proposed as a new tool to depict the crystal growth mechanism in a magmatic environment. The Natural Neighbour method is proposed for interpolation of Electron Microprobe Analysis (EMPA) data; the Natural Neighbour method and Kriging method are proposed for interpolating data collected by the LA-ICP-MS method. The crystal growth texture was analysed with the application of DC-DM derivatives: 3D surface models, shaded relief images, aspect and slope maps. The magmatic mass properties were depicted with the application of solid models. Correlation between the distributions of two elements on a single crystal transect was made by operations on the obtained raster DC-DMs. The methodology presented is a universal one but it seems to be significant for the depiction of magma mixing processes and the heterogeneity of the magmatic mass.
    Źródło:
    Acta Geologica Polonica; 2012, 62, 1; 129-141
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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