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Proceedings Paper

Heavy metals biomonitoring in the Mexico City metropolitan area
Author(s): M. Carmen Gonzalez; M. Antonio Tenorio
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Paper Abstract

Foliose lichens genera Parmotrema sp. and Parmelia sp. were used to monitor airborne heavy metal pollution in the Mexico City Metropolitan Area (MCMA). The samples were taken every three months in four selected places surrounding the urban areas (N, S, W, E). Also, another place far from the influence of the city was chosen as a reference site, and, lichens dwelling in Juniperus sp. twigs were transplanted from this site to our facilities in Mexico City and placed hanging from tree branches in order to measure the metal accumulation values in known time periods. Eight metals were measured (Pb, Cr, Cu, Fe, Zn, Cd, K, and Ca) due to their importance in the automobile and industrial pollution sector. The results show that lichens growing in near the MCMA get concentrations one order of magnitude over the lichens growing in the distant reference site. In particular Pb, Cu, and Zn present higher values south of the city which is in accordance with the dominant winds. Regarding the transplanted lichens, a significant increase in the concentration of Pb, Cu, and Zn was found after a nine month period.

Paper Details

Date Published: 9 March 1993
PDF: 11 pages
Proc. SPIE 1716, International Conference on Monitoring of Toxic Chemicals and Biomarkers, (9 March 1993); doi: 10.1117/12.140256
Show Author Affiliations
M. Carmen Gonzalez, Instituto Mexicano del Petroleo (Mexico)
M. Antonio Tenorio, Instituto Mexicano del Petroleo (Mexico)

Published in SPIE Proceedings Vol. 1716:
International Conference on Monitoring of Toxic Chemicals and Biomarkers

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