Platinum in PM2.5 of the metropolitan area of Mexico City
Por:
Morton-Bermea O., Amador-Muñoz O., Martínez-Trejo L., Hernández-Álvarez E., Beramendi-Orosco L., García-Arreola M.E.
Publicada:
1 oct 2014
Resumen:
The increase in platinum (Pt) in the airborne particulate matter with
size a parts per thousand currency sign2.5 A mu m (PM2.5) in urban
environments may be interpreted as result of the abrasion and
deterioration of automobile catalyst. Nowadays, about four million
vehicles in Mexico City use catalytic converters, which means that their
impact should be considered. In order to evaluate the contribution of Pt
to environmental pollution of the metropolitan area of Mexico City
(MAMC), airborne PM2.5 was collected at five different sites in the
urban area (NW, NE, C, SW, SE) in 2011 during April (dry-warm season),
August (rainy season) and December (dry-cold season). Analytical
determinations were carried out using a ICP-MS with a collision cell and
kinetic energy discrimination. The analytical and instrument performance
was evaluated with standard road dust reference material (BCR-723).
Median Pt concentration in the analyzed particulate was is 38.4 pg m(-3)
(minimal value 1 pg m(-3) maximal value 79 pg m(-3)). Obtained Pt
concentrations are higher than those reported for other urban areas.
Spatial variation shows that SW had Pt concentration significantly
higher than NW and C only. Seasonal variation shows that Pt median was
higher in rainy season than in both dry seasons. A comparison of these
results with previously reported data of PM10 from 1991 and 2003 in the
same studied area shows a worrying increase in the concentration of Pt
in the air environment of MAMC.
Filiaciones:
Morton-Bermea O.:
Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico, DF 04150, Mexico
Amador-Muñoz O.:
Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, Mexico, DF 04150, Mexico
Universidad Nacional Autónoma de México, Mexico, DF 04150, Mexico
Martínez-Trejo L.:
Universidad Nacional Autónoma de México, Mexico, DF 04150, Mexico
Hernández-Álvarez E.:
Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Mexico, DF 04150, Mexico
Beramendi-Orosco L.:
Instituto de Geología, Universidad Nacional Autónoma de México, Mexico, DF 04150, Mexico
Universidad Nacional Autónoma de México, Mexico, DF 04150, Mexico
García-Arreola M.E.:
Instituto de Geología, Universidad Autónoma de San Luis Potosí, San Luis Potosí, SLP Mexico, DF 78240, Mexico
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