Platinum concentration in PM2.5 in the Mexico City Metropolitan Area: relationship to meteorological conditions
Por:
Garza-Galindo, Rodrigo, Morton-Bermea, Ofelia, Hernandez-Alvarez, Elizabeth, Ordonez-Godinez, Sara L., Amador-Munoz, Omar, Beramendi-Orosco, Laura, Retama-Hernandez, Armando, MIRANDA, JAVIER, Rosas-Perez, Irma
Publicada:
27 may 2020
Resumen:
Platinum (Pt) concentrations in PM2.5 were evaluated by means of
inductively coupled plasma mass spectrometry (ICP-MS) to evaluate the
spatial and temporal behavior and to assess trends. Samples were taken
from five representative sites in the Mexico City Metropolitan Area
(MCMA): Tlalnepantla-northwest (NW), San Agustin-northeast (NE), La
Merced -center (C), Coyoacan-southwest (SW), and Universidad Autonoma
Metropolitana Iztapalapa-southeast (SE). Under three weather conditions:
dry warm (DW-April), rainy (R-August), and dry cold (DC-November) in
2013. We found that the PM2.5 median mass concentration was 24 mu g
m(-3) +/- 15 mu g m(-3) while Pt concentration was 55 pg m(-3) +/- 15 pg
m(-3) (median, interquartile range). Seasonal trend was identified: the
concentrations decreased significantly in the following order DC > R>DW.
No spatial distribution was observed. Interestingly, among other
meteorically parameters, wind intensity resulted to be the major factor
for the dispersion of Pt in PM2.5 in MCMA. Furthermore, we found that Pt
concentrations increased significantly by 19.6% between 2011 and 2013.
Regardless of the increase in Pt, carbon monoxide (CO) levels decreased
opposite to a rise in vehicular fleet. These results urge for
environment public policies that address the upward tendency of Pt
levels especially in urban areas.
Filiaciones:
Garza-Galindo, Rodrigo:
Univ Nacl Autonoma Mexico, Posgrad Ciencias Tierra, Cd De Mexico 04510, Mexico
Morton-Bermea, Ofelia:
Univ Nacl Autonoma Mexico, Inst Geofis, Cd De Mexico, Mexico
Hernandez-Alvarez, Elizabeth:
Univ Nacl Autonoma Mexico, Inst Geofis, Cd De Mexico, Mexico
Ordonez-Godinez, Sara L.:
Univ Nacl Autonoma Mexico, Inst Geofis, Cd De Mexico, Mexico
Amador-Munoz, Omar:
Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Cd De Mexico, Mexico
Beramendi-Orosco, Laura:
Univ Nacl Autonoma Mexico, Inst Geol & Lab Nacl Geoquim, Cd De Mexico, Mexico
Retama-Hernandez, Armando:
Gobierno Cd Mexico, Secretaria Medio Ambiente, Cd De Mexico, Mexico
MIRANDA, JAVIER:
Univ Nacl Autonoma Mexico, Inst Fis, Cd De Mexico, Mexico
Rosas-Perez, Irma:
Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Cd De Mexico, Mexico
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