Abstract
A study of the concentrations of elements present in atmospheric aerosols at two different sites in Mexico City was done with samples taken during September 1990 and February 1991. The samples were taken daily during 6 h periods (from 6:00 to 12:00 hr), using a Stacking Filter Unit (SFU) of the Davis design. This allowed the separation of particles with sizes ranging from 2.5 to 15 μm (coarse mass), and smaller than 2.5 μm (fine mass). Analyses of the samples with Proton Induced X-ray Emission (PIXE) gave information on elements heavier than Ne, Proton Elastic Scattering Analysis (PESA) on hydrogen contents, and the Laser Integrating Plate Method (LIPM) was used on the fine fraction to determine soot contents. Cluster Analysis is applied to the sample set in order to identify the emission sources of the elements. Additionally, the relationship to several meteorological variables is presented. Comparisons with previous studies are also provided.
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