Auflistung nach Autor:in "Temesi, Dóra"

Gerade angezeigt 1 - 2 von 2
  • Vorschaubild nicht verfügbar
    Publikation
    Role of organic and black carbon in the chemical composition of atmospheric aerosol at European background sites
    (Elsevier, 10/2001) Krivácsy, Zoltán; Hoffer, András; Sárvári, Zsolt; Temesi, Dóra; Baltensperger, Urs; Nyeki, Stephan; Weingartner, Ernest; Kleefeld, Silke; Jennings, Stephen Gerard [in: Atmospheric Environment]
    The mass concentrations of inorganic ions, water-soluble organic carbon, water-insoluble organic carbon and black carbon were determined in atmospheric aerosol collected at three European background sites: (i) the Jungfraujoch, Switzerland (high-alpine, PM2.5 aerosol); (ii) K-puszta, Hungary (rural, PM1.0 aerosol); (iii) Mace Head, Ireland (marine, total particulate matter). At the Jungfraujoch and K-puszta the contribution of carbonaceous compounds to the aerosol mass was higher than that of inorganic ions by 33% and 94%, respectively. At these continental sites about 60% of the organic carbon was water soluble, 55–75% of the total carbon proved to be refractory and a considerable portion of the water soluble, refractory organic matter was composed of humic-like substances. At Mace Head the mass concentration of organic matter was found to be about twice than that of nonsea-salt ions, 40% of the organic carbon was water soluble and the amount of highly refractory carbon was low. Humic-like substances were not detected but instead low molecular weight carboxylic acids were responsible for about one-fifth of the water-soluble organic mass. These results imply that the influence of carbonaceous compounds on aerosol properties (e.g. hygroscopic, optical) might be significant.
    01A - Beitrag in wissenschaftlicher Zeitschrift
  • Vorschaubild nicht verfügbar
    Publikation
    Study on the chemical character of water soluble organic compounds in fine atmospheric aerosol at the Jungfraujoch
    (Springer, 07/2001) Krivácsy, Zoltán; Gelencsér, András; Kiss, Gyula; Mészáros, Ernő; Molnár, Ágnes; Hoffer, András; Mészáros, Tamás; Sárvári, Zsolt; Temesi, Dóra; Varga, Bálint; Baltensperger, Urs; Nyeki, Stephan; Weingartner, Ernest [in: Journal of Atmospheric Chemistry]
    In this study the chemical nature of the bulk of water soluble organic compounds in fine atmospheric aerosol collected during summer 1998 at the Jungfraujoch, Switzerland (3580 m asl) is characterised. The mass concentration of water soluble organic substances was similar to those of major inorganic ions, and the water soluble organic matter was found to be composed of two main fractions: (i) highly polyconjugated, acidic compounds with a varying degree of hydrophobicity and (ii) slightly polyconjugated, neutral and very hydrophilic compounds. The contribution of both fractions to the total water soluble organic carbon was about 50%. Separation into individual components was impossible either by HPLC or capillary electrophoresis which indicates the presence of a high number of chemically similar but not identical species. Results obtained by ultrafiltration and HPLC-MS have shown that the molecular weights are of the order of several hundreds. Most of the protonation constants for the acidic compounds determined by capillary electrophoresis were in the range 10⁴-10⁷.
    01A - Beitrag in wissenschaftlicher Zeitschrift