HR: 1400h
AN: A43A-16 [Abstracts]
TI: Seasonal Variation of Polyciclic Aromatic Hydrocarbons in the Atmosphere of Mexico City
AU: * Mugica, V
EM: vma@correo.azc.uam.mx
AF: Universidad Autónoma Metropolitana-Azcapotzalco, Av San Pablo 180 Col Reynoza, Mexico,
EM: s_mayen9@yahoo.com.mx
AF: Universidad Autónoma Metropolitana-Azcapotzalco, Av San Pablo 180 Col Reynoza, Mexico,
EM: trm@correo.azc.uam.mx
AF: Universidad Autónoma Metropolitana-Azcapotzalco, Av San Pablo 180 Col Reynoza, Mexico,
EM: gmrocio@troposfera.atmosfcu.unam.mx
AF: Centro de Ciencias de la Atmósfera, Circuito Exterior Ciudad Universitaria, Mexico, DF
04510, Mexico
AB:
With the aim to determine concentrations levels and seasonal variation of polyaromatic hydrocarbons (PAH) in
the northern of Mexico City, three sampling campaigns were performed during cold dry season, rain season and
hot dry season in 2005. Particle-bound polycyclic aromatic hydrocarbons were collected on quartz fiber filters and
gas-phase PAH was collected into polyurethane foam (PUF) with XAD-4 resin. Both types of samples were
extracted with a dichloromethane and acetonitrile (2:1). Quantification of 17 PAH was carried out using gas
chromatography .mass spectrometry (GC-MS). Recovery factors were determined by spiking filters with standard
(NIST SRM 1647c). Average PM10 concentrations during the three seasons were 62.3, 68.9 and 131 μ gm-
3 for hot dry season, rainy season and hot dry season respectively. In the hot dry season the total of
quantified PAH in particles was in average 1.99±0.82 ngm-3 and the dominant PAH compounds
were Pyr, BghiP and Cry; the rainy season presented a total of 2.8± 1.2 ngm-3 of quantified PAH in
particles and the pore abundant PAH were BaA, BbF, and BghiP; the cold dry season presented the highest
concentrations with an average of quantified PAH in particles of 15.5± 4.9 ng-3 and BbF, BaA, and
BghiP were the most abundant compounds. The most abundant PAH in the gaseous phase in the three seasons
were naphtalene, pyrene and acenaphtylene with average concentrations of 132, 2.7 and 2.1 ngm-3 in the
hot dry season, 18.1, 0.47 and 1.8 ngm-3 in the rainy season and 58, 1.71 and 2.37 ngm-3 in the
cold dry season. Principal component analyses and cluster analyses were applied to relate the PAH
concentrations with their sources.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly