AAAR 32nd Annual Conference
September 30 - October 4, 2013
Oregon Convention Center
Portland, Oregon, USA
Abstract View
Evaluation of PM10 Trace Metals in the Airshed of Tijuana, México
YANETH GUTIERREZ, Guillermo Rodriguez, Penelope Quintana, Nina Bogdanchikova, Miguel Zavala, Luisa Molina, Universidad Autonoma de Baja California, Tijuana, Mexico
Abstract Number: 154 Working Group: Urban Aerosols
Abstract Trace metal associated to PM10 in the urban air basin of Tijuana, B C, Mexico, where local industries, transportation, and urbanization are adversely affecting air quality. Air sampling was done in four sampling sites: commercial (SS1), traffic (SS2), residencial (SS3) and industrial area (SS4), using a high-volume sampler and metals were estimated in PM10 by ICP-OES analysis. To distinguish soil suspension from anthropogenic input, enrichment factor was calculated for site and seasonally variations. An daily and annual mean PM10 was calculated for SS1 to SS4, three dayly violations was found related to (SS2) and (SS3) (120 µg/m3) and three annual violations corresponding to (SS!, SS2 and SS4) only residential (SS3) was inside anual PM10 mean (50 µg/m3), related to mexican regulation NOM-025-SSA1-1993 during 2012 and 2013.
The PM10 metals concentration and enrichment factor related to urban background were calculated for Al, As, Ba, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, Se, Sr, Zn, and compared with those reported in literature for other regions. Metals concentration with enrichment factor greater than 10, means that is generated by an antropogenic emission thus SS: metal relation is as follow: for SS1 (As, Cu, Zn), SS2 (Cu, As), SS3 ( As, Cu, Zn) and SS4 ( Cu, Zn, Ni, Pb). Highest levels was found for Lead at industrial area, Cooper for comercial, Arsenic for residential, and Zinc in all SS.
Metals concentration average difference between the sampling sites and corresponding urban background aerosol was influenced by metereology and site activities.