Tytuł pozycji:
Organic Hydroxy Acids as Highly Oxygenated Molecular (HOM) Tracers for Aged Isoprene Aerosol
- Tytuł:
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Organic Hydroxy Acids as Highly Oxygenated Molecular (HOM) Tracers for Aged Isoprene Aerosol
- Autorzy:
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Kolodziejczyk, Agata
Sarang, Kumar
Nestorowicz, Klara
Kleindienst, Tadeusz E.
Lewandowski, Michael
Jaoui, Mohammed
Rudzinski, Krzysztof J
Konopka, Anna
Bulska, Ewa
Szmigielski, Rafal
- Współwytwórcy:
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University of Warsaw, Faculty of Chemistry, Biological and Chemical Research Centre, Poland
Institute of Physical Chemistry, Polish Academy of Sciences
United States Environmental Protection Agency
- Słowa kluczowe:
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highly oxygenated molecules
mass spectrometry
isoprene
- Data publikacji:
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2019-11-22
- Wydawca:
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American Chemical Society
- ISBN, ISSN:
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0013936X
- Język:
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angielski
- Linki:
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https://depot.ceon.pl/handle/123456789/21154  Link otwiera się w nowym oknie
- Prawa:
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http://creativecommons.org/licenses/by-nc-nd/3.0/pl/
- Dostawca treści:
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Repozytorium Centrum Otwartej Nauki
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Przejdź do źródła  Link otwiera się w nowym oknie
Highly oxygenated molecules (HOMs) are a class of compounds associated with secondary organic aerosols exhibiting high oxygen to carbon (O:C) ratios and often originating from the oxidation of biogenic compounds. Here, the photooxidation and ozonolysis of isoprene were examined under a range of conditions to identify HOM tracers for aged isoprene aerosol. The HOM tracers were identified as silylated derivatives by gas chromatography− mass spectrometry and by detecting their parent compounds by liquid chromatography−high resolution mass spectrometry. In addition to the previously observed methyltetrols and 2-methylglyceric acid, seven tracer compounds were identified, including 2-methyltartronic acid (MTtA), 2 methylerythronic acid (2MeTrA), 3 methylerythronic acid (3MeTrA), 2 methylthreonic acid (2MTrA), 3-methylthreonic acid (3MTrA), erythro-methyltartaric acid (e MTA), and threo-methyltartaric acid (t-MTA). The molecular structures were confirmed with authentic standards synthesized in the laboratory. The presence of some of these HOMs in the gas and particle phases simultaneously provides evidence of their gas/particle partitioning. To determine the contributions of aged isoprene products to ambient aerosols, we analyzed ambient PM2.5 samples collected in the southeastern United States in summer 2003 and at two European monitoring stations located in Zielonka and Godów (Poland). Our findings show that methyltartaric acids (MTA) and 2- and 3 methylthreonic acids (and their stereoisomers) are representative of aged isoprene aerosol because they occur both in the laboratory chamber aerosol obtained and in ambient PM2.5. On the basis of gas chromatography−mass spectrometry (GC-MS) analysis, their concentrations were found to range from 0.04 ng for 3-methylthreonic acid to 6.3 ng m−3 for methyltartaric acid at the southeast site in Duke Forest, NC, USA.