Počet záznamů: 1
Size-segregated urban aerosol characterization by electron microscopy and dynamic light scattering and influence of sample preparation
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SYSNO ASEP 0494587 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Size-segregated urban aerosol characterization by electron microscopy and dynamic light scattering and influence of sample preparation Tvůrce(i) Marvanová, S. (CZ)
Kulich, P. (CZ)
Skoupý, Radim (UPT-D) RID, ORCID, SAI
Hubatka, F. (CZ)
Cigánek, M. (CZ)
Bendl, J. (CZ)
Hovorka, J. (CZ)
Machala, M. (CZ)Celkový počet autorů 8 Zdroj.dok. Atmospheric Environment. - : Elsevier - ISSN 1352-2310
Roč. 178, APR (2018), s. 181-190Poč.str. 10 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova particulate matter ; size-segregated ; electron microscopy ; energy dispersive X-ray spectroscopy ; dynamic light scattering ; agglomeration Vědní obor RIV JA - Elektronika a optoelektronika, elektrotechnika Obor OECD Environmental sciences (social aspects to be 5.7) Institucionální podpora UPT-D - RVO:68081731 UT WOS 000428104200020 EID SCOPUS 85041405694 DOI 10.1016/j.atmosenv.2018.02.004 Anotace Size-segregated particulate matter (PM) is frequently used in chemical and toxicological studies. Nevertheless, toxicological in vim) studies working with the whole particles often lack a proper evaluation of PM real size distribution and characterization of agglomeration under the experimental conditions. In this study, changes in particle size distributions during the PM sample manipulation and also semiquantitative elemental composition of single particles were evaluated. Coarse (1-10 mu m), upper accumulation (0.5-1 mu m), lower accumulation (0.17-0.5 mu m), and ultrafine (< 0.17 mu m) PM fractions were collected by high volume cascade impactor in Prague city center. Particles were examined using electron microscopy and their elemental composition was determined by energy dispersive X-ray spectroscopy. Larger or smaller particles, not corresponding to the impaction cut points, were found in all fractions, as they occur in agglomerates and are impacted according to their aerodynamic diameter. Elemental composition of particles in size-segregated fractions varied significantly. Ns-soot occurred in all size fractions. Metallic nanospheres were found in accumulation fractions, but not in ultrafine fraction where ns-soot, carbonaceous particles, and inorganic salts were identified. Dynamic light scattering was used to measure particle size distribution in water and in cell culture media. PM suspension of lower accumulation fraction in water agglomerated after freezing/thawing the sample, and the agglomerates were disrupted by subsequent sonication. Ultrafine fraction did not agglomerate after freezing/thawing the sample. Both lower accumulation and ultrafine fractions were stable in cell culture media with fetal bovine serum, while high agglomeration occurred in media without fetal bovine serum as measured during 24 h. Pracoviště Ústav přístrojové techniky Kontakt Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Rok sběru 2019
Počet záznamů: 1