Molecular Markers in Ambient Air Associated with Biomass Burning in Morelos, México
| Autor: | Jorge Guerrero-Álvarez, Mónica Ivonne Arias-Montoya, Pedro Reyes, Hugo Saldarriaga-Noreña, Josefina Vergara-Sánchez, Rebecca López-Márquez, Mario Alfonso Murillo-Tovar, Silvia Montiel-Palma, Fernando Ramos-Quintana |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Atmospheric Science
Levoglucosan Potassium Ion chromatography chemistry.chemical_element Environmental Science (miscellaneous) Glutaric acid Malonic acid lcsh:QC851-999 Mass spectrometry Aerosol chemistry.chemical_compound levoglucosan chemistry Succinic acid open burning Environmental chemistry forest fires dicarboxylic acids lcsh:Meteorology. Climatology |
| Zdroj: | Atmosphere Volume 11 Issue 5 Atmosphere, Vol 11, Iss 491, p 491 (2020) |
| ISSN: | 2073-4433 |
| DOI: | 10.3390/atmos11050491 |
| Popis: | Atmospheric particles with an aerodynamic diameter less than or equal to 2.5 micrometers (PM2.5) were collected at two sites located in the urban area of the city of Cuernavaca (Morelos) during a season when a large number of forest fires occurred. Three dicarboxylic acids (malonic, glutaric and succinic) and levoglucosan were analyzed by liquid chromatography coupled with mass spectrometry (ESI-Q-TOF) and soluble potassium (K+) was analyzed by ion chromatography. The concentration of PM2.5 increased on the days when the highest number of forest fires occurred. A strong correlation was observed between levoglucosan and K+, confirming the hypothesis that both are tracers of biomass burning (r = 0.57, p < 0.05). Levoglucosan (average 367.6 ng m&minus 3, Site 2) was the most abundant compound, followed by succinic acid (average 101.7 ng m&minus 3, Site 2), glutaric acid (average 63.2 ng m&minus 3, Site 2), and malonic acid (average 46.9 ng m&minus 3, Site 2), respectively. The ratio of C3/C4 concentrations ranged from 0.5 to 1.2, with an average of 0.8, which suggests great photochemical activity in the Cuernavaca atmosphere. The ratio of K+/levoglucosan concentrations (0.44) indicates that open fires are the main source of these tracers. The positive correlations between PM2.5 and levoglucosan and succinic and malonic acids suggest that such compounds are contributing to secondary organic aerosol particle formation. |
| Databáze: | OpenAIRE |
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