AMS C-14 AND CHEMICAL COMPOSITION OF ATMOSPHERIC AEROSOLS FROM MEXICO CITY
Por:
Solis, C., Gomez, V., Ortiz, E., Chavez, E., Miranda, J., Aragon, J., Martinez, M. A., Castro, T., Peralta, O.
Publicada:
1 abr 2017
Resumen:
Air pollution in Mexico City, which has more than 22 million
inhabitants, continues to be one of the main environmental issues.
Aerosol samples (PM10) collected in Mexico City and the city of
Cuernavaca (a clean reference site) have been characterized using
different techniques. This multifaceted approach addresses the source
apportionment of the carbonaceous matter in PM10, as well as the
airborne elements and ions. Accelerator mass spectrometry (AMS)
radiocarbon analysis of total carbon, X-ray fluorescence (XRF), and ion
chromatography were performed on aerosols collected at three sites in
Mexico City and one site in Cuernavaca, during 2 months of the cold-dry
season (November-December) in 2012. New results obtained for Mexico City
are compared with previous reports. Average levels of PM10 were higher
in Mexico City sites (43.3-60.8 mu g/ m(3)) than in Cuernavaca (32.2 mu
g/ m(3)). According to the material balance, PM10 collected in Mexico
City had a lower contribution of crustal material (31.2-36.8%) than
Cuernavaca (46.9%). Average contributions of particulate carbonaceous
matter to PM10 were similar in both cities, but much higher
contributions of mineral salts, trace elements, and ions were observed
in Mexico City in comparison to Cuernavaca. Total organic carbon (OC)
and elemental carbon (EC) contents were higher in aerosols from Mexico
City than those from Cuernavaca. The temporal variation results showed
that within all locations studied the OC concentration was high compared
to the EC. Results from a theoretical calculation of fossil carbon (FC)
and biogenic carbon (BC) concentrations showed that FC and BC levels
depend on the site: at Mexico City sites, FC was equal or higher than
BC. At Cuernavaca, BC was always higher than FC.
Filiaciones:
Solis, C.:
Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico
Gomez, V.:
Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Mexico City 04510, DF, Mexico
Ortiz, E.:
Univ Autonoma Metropolitana Azcapotzalco, Dept Ciencias Basicas, Av San Pablo 180, Mexico City 02200, DF, Mexico
Chavez, E.:
Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico
Miranda, J.:
Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico
Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Mexico City 04510, DF, Mexico
Aragon, J.:
Univ Nacl Autonoma Mexico, Inst Fis, Apartado Postal 20-364, Mexico City 01000, DF, Mexico
Martinez, M. A.:
Univ Nacl Autonoma Mexico, Fac Ciencias, Mexico City 04510, DF, Mexico
Castro, T.:
Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Mexico City 04510, DF, Mexico
Peralta, O.:
Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Mexico City 04510, DF, Mexico
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