Papers by Beata Zielinska
Atmospheric Environment (1967), 1989
addition to the dominant nitroarenes 2-nitrofluoranthene and l-and 2-nitropyrene, the less abunda... more addition to the dominant nitroarenes 2-nitrofluoranthene and l-and 2-nitropyrene, the less abundant nitroarenes of molecular weight 247 in ambient particles collected during summer and winter pollutant episode conditions in southern California have been identified by gas chromatography/mass spectrometry. The approximate order of abundance of these. nitroarenes was: 2-nitrofluoranthene > lnitropyrene N 2-nitropyrene z 8-nitrofluoranthene 2 3-nitrofluoranthene > 7-nitrofluoranthene > a nitroacephenanthrylene y 4-nitropyrene. The concentrations of 2_nitrofluoranthene, l-and 2-nitropyrene and, in some cases, 3-and 8-nitrofluoranthene in 12 ambient samples are given. Significant differences in the distributions of these nitroarene isomers were observed among these samples and these are attributed to the varying importance of direct emission and atmospheric formation by reaction of the gaseous parent polycyclic aromatic hydrocarbon with N,O, and/or the OH radical (in the presence of NO,). In particular, a very high (2 100) 2-nitrofluoranthene/2-nitropyrene concentration ratio appears to be indicative of nitroarene formation through night-time N,O, reaction.
Atmospheric Chemistry and Physics Discussions, 2011
We present results from two field deployments of a unique tandem differential mobility analyzer (... more We present results from two field deployments of a unique tandem differential mobility analyzer (TDMA) configuration with two primary capabilities: identifying alternative stable or meta-stable ambient aerosol hydration states associated with hysteresis in aerosol hydration behavior and determining the actual Ambient hydration State (AS-TDMA). This data set is the first to fully classify the ambient hydration state of aerosols despite recognition that hydration state significantly impacts the roles of aerosols in climate, visibility and heterogeneous chemistry. The AS-TDMA was installed at a site in eastern Tennessee on the border of Great Smoky Mountains National Park for projects during the summer of 2006 and winter of 2007-2008. During the summer, 12 % of the aerosols sampled in continuous AS-TDMA measurements were found to posses two possible hydration states under ambient conditions. In every case, the more hydrated of the possible states was occupied. The remaining 88 % did not posses multiple possible states. In continuous measurements during the winter, 49 % of the aerosols sampled possessed two possible ambient hydration states; the remainder possessed only one. Of those aerosols with multiple possible ambient hydration states, 65 % occupied the more hydrated state; 35 % occupied the less hydrated state. This seasonal contrast is supported by differences in the fine particulate (PM2.5) composition and ambient RH as measured during the two study periods. In addition to seasonal summaries, this work includes case studies depicting the variation of hydration state with changing atmospheric conditions.
Atmospheric Chemistry and Physics Discussions, 2011
We present results from two field deployments of a unique tandem differential mobility analyzer (... more We present results from two field deployments of a unique tandem differential mobility analyzer (TDMA) configuration with two primary capabilities: identifying alternative stable or meta-stable ambient aerosol hydration states associated with hysteresis in aerosol hydration behavior and determining the actual Ambient hydration State (AS-TDMA). This data set is the first to fully classify the ambient hydration state of aerosols despite recognition that hydration state significantly impacts the roles of aerosols in climate, visibility and heterogeneous chemistry. The AS-TDMA was installed at a site in eastern Tennessee on the border of Great Smoky Mountains National Park for projects during the summer of 2006 and winter of 2007-2008. During the summer, 12 % of the aerosols sampled in continuous AS-TDMA measurements were found to posses two possible hydration states under ambient conditions. In every case, the more hydrated of the possible states was occupied. The remaining 88 % did not posses multiple possible states. In continuous measurements during the winter, 49 % of the aerosols sampled possessed two possible ambient hydration states; the remainder possessed only one. Of those aerosols with multiple possible ambient hydration states, 65 % occupied the more hydrated state; 35 % occupied the less hydrated state. This seasonal contrast is supported by differences in the fine particulate (PM2.5) composition and ambient RH as measured during the two study periods. In addition to seasonal summaries, this work includes case studies depicting the variation of hydration state with changing atmospheric conditions.
Journal of Physics and Chemistry of Solids, 2008
Several chemical compounds based lithium niobate have been tested in the reaction for the photoca... more Several chemical compounds based lithium niobate have been tested in the reaction for the photocatalytic hydrogen generation. The photocatalysts have been prepared by impregnation of Nb 2 O 5 in the aqueous solution of lithium hydroxide and then the calcination at the temperature range of 400-650 1C. In this report, we present the interesting study showing that the most active catalyst for the photocatalytic generation of hydrogen is the one containing two lithium niobate phases such as LiNbO 3 and LiNb 3 O 8 . It means that the lithium niobates based catalyst without any further modification or doping can be applied as a novel material for this process. r
Journal of Physics and Chemistry of Solids, 2011
The Co 3 O 4 /LiNbO 3 composites were synthesized by impregnation of LiNbO 3 in an aqueous soluti... more The Co 3 O 4 /LiNbO 3 composites were synthesized by impregnation of LiNbO 3 in an aqueous solution of cobalt nitrate and next by calcination at 400°C. The activity of produced samples has been investigated in the reaction of photocatalytic hydrogen generation. The crystallographic phases, optical and vibronic properties were studied using X-ray diffraction (XRD), diffuse reflectance (DR) UV-vis and resonance Raman spectroscopic techniques, respectively. The influence of cobalt content (range from 0.5 wt.% to 4 wt.%) on the photocatalytic activity of Co 3 O 4 /LiNbO 3 composites for photocatalytic hydrogen generation has been investigated. Co 3 O 4 /LiNbO 3 composites exhibited higher than LiNbO 3 photocatalytic activity for hydrogen generation. The highest H 2 evolution efficiency was observed for Co 3 O 4 /LiNbO 3 composite with 3 wt.% cobalt content. The amount of H 2 obtained in the presence of LiNbO 3 and Co 3 O 4 /LiNbO 3 (3 wt.% of cobalt content) was 1.38 µmol/min and 2.59 µmol min -1 , respectively. 920 Cent. Eur. J. Chem. • 11(6) • 2013 • 920-926
Physical Review C, 2009
U230 and its daughter nuclide Th226 are novel therapeutic nuclides for application in targeted α ... more U230 and its daughter nuclide Th226 are novel therapeutic nuclides for application in targeted α therapy of cancer. We investigated the feasibility of producing U230/Th226 via deuteron irradiation of Pa231 according to the reaction Pa231(d,3n)U230. The experimental excitation function for a deuteron-induced reaction on Pa231 is reported for the first time. Cross sections were measured using thin targets of Pa231 prepared by electrodeposition and U230 yields were analysed using α spectrometry. Beam energies were calculated from measured beam orbits and compared with the values obtained via monitor reactions on aluminium foils using high-resolution γ spectrometry and IAEA recommended cross sections. Beam intensities were determined using a beam current integrator. The experimental cross sections are in excellent agreement with model calculations allowing for deuteron breakup using the EMPIRE 3 code. According to thick-target yields calculated from the experimental excitation function, the reaction Pa231(d,3n)U230 allows the production of U230/Th226 at moderate levels.
Physical Review C, 2009
²³°U and its daughter nuclide ²²Th are novel therapeutic nuclides for application in targeted the... more ²³°U and its daughter nuclide ²²Th are novel therapeutic nuclides for application in targeted therapy of cancer. We investigated the feasibility of producing ²³°U/²²Th via deuteron irradiation of ²³¹Pa according to the reaction ²³¹Pa(d,3n)²³°U. The experimental excitation function for a deuteron-induced reaction on ²³¹Pa is reported for the first time. Cross sections were measured using thin targets of ²³¹Pa prepared by electrodeposition and ²³°U yields were analysed using spectrometry. Beam energies were calculated from measured beam orbits and compared with the values obtained via monitor reactions on aluminium foils using high-resolution spectrometry and IAEA recommended cross sections. Beam intensities were determined using a beam current integrator. The experimental cross sections are in excellent agreement with model calculations allowing for deuteron breakup using the EMPIRE 3 code. According to thick-target yields calculated from the experimental excitation function, the reaction ²³¹Pa(d,3n)²³°U allows the production of ²³°U/²²Th at moderate levels.
Physical Review C, 2009
²³°U and its daughter nuclide ²²Th are novel therapeutic nuclides for application in targeted the... more ²³°U and its daughter nuclide ²²Th are novel therapeutic nuclides for application in targeted therapy of cancer. We investigated the feasibility of producing ²³°U/²²Th via deuteron irradiation of ²³¹Pa according to the reaction ²³¹Pa(d,3n)²³°U. The experimental excitation function for a deuteron-induced reaction on ²³¹Pa is reported for the first time. Cross sections were measured using thin targets of ²³¹Pa prepared by electrodeposition and ²³°U yields were analysed using spectrometry. Beam energies were calculated from measured beam orbits and compared with the values obtained via monitor reactions on aluminium foils using high-resolution spectrometry and IAEA recommended cross sections. Beam intensities were determined using a beam current integrator. The experimental cross sections are in excellent agreement with model calculations allowing for deuteron breakup using the EMPIRE 3 code. According to thick-target yields calculated from the experimental excitation function, the reaction ²³¹Pa(d,3n)²³°U allows the production of ²³°U/²²Th at moderate levels.
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Papers by Beata Zielinska