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| Titel |
{Polycyclic aromatic hydrocarbons (PAHs) and aliphatic hydrocarbons in gas and particle phases in two sites of Mexico: MILAGRO project} |
| VerfasserIn |
O. Amador-Muñoz, R. Villalobos-Pietrini, T. Castro, R. Gaspariano-Larino |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250031027
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| Zusammenfassung |
| Aliphatic hydrocarbons are markers of anthropogenic and biogenic emission sources1;
meanwhile PAHs are generated by incomplete combustion sources2. The last ones are
important compounds due to their carcinogenic and mutagenic properties3,4. The aim of this
study was to identify and quantify aliphatic hydrocarbons and PAHs in gas and
particles phases of the atmospheric aerosol and to determine the day and night time
behavior during the MILAGRO (Megacity Initiative: Local Global and Research
Observations) campaign. The gas phase was collected on polyurethane foam, while
particles less than 2.5 μm (PM2.5) were collected on glass fiber filters covered with
Teflon (TIGF, pallflex) of 8x10 in. Samplings were carried out with a high volume
sampler (Tisch) with a flow of 1.13 m3 min-1 at two sites: Instituto Mexicano
del Petróleo (T0) and Tecamac (T1) located at North and Northeast of Mexico
City, respectively during day (7:00 am-7:00 pm) and night time (7:00 pm-7:00 am)
from 1 to 29 of March, 2006. Ninteen PAHs and 23 aliphatic hydrocarbons from
n-C13H28 to n-C35H72 were analyzed by gas chromatography coupled to mass
spectrometry in impact mode. The samples were spiked with deuterads PAHs and aliphatics
hydrocarbons before ultrasound extraction. Medians comparisons were made with
Mann-Whitney U test. PAHs with molecular weight (MW) less than 228 g mol-1
were distributed in the gas phase, in both sites. Higher concentrations of PAHs -¥
228 g mol-1 in PM2.5, were observed during night period (p |
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