Assessment of atmospheric metallic pollution in the metropolitan region of São Paulo, Brazil, employing Tillandsia usneoides L. as biomonitor.
Environ Pollut
; 145(1): 279-92, 2007 Jan.
Article
em En
| MEDLINE
| ID: mdl-16777290
ABSTRACT
Tillandsia usneoides L. is an epiphytic bromeliad plant able to absorb water and nutrients directly from the air. For this reason this species was selected to carry out a monitoring study of air pollution in the metropolitan region of São Paulo, Brazil. Five consecutive transplantation experiments (8 weeks each) were performed in 10 sites of the city, submitted to different sources of air pollution (industrial, vehicular), using plants collected from an unpolluted area. After exposure, trace metals were analyzed in the plant by instrumental neutron activation analysis. Traffic-related elements such as Zn and Ba presented high concentrations in exposure sites near to heavy traffic avenues (cars, buses and trucks) and may be associated to vehicular sources. For Zn and Co the highest contents were related to industrial zones and can be associated to the presence of anthropogenic emission sources. The rare earth elements, Fe and Rb, probably have soil particles as main source.
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Base de dados:
MEDLINE
Assunto principal:
Tillandsia
/
Poluentes Atmosféricos
/
Metais
Tipo de estudo:
Etiology_studies
/
Risk_factors_studies
País como assunto:
America do sul
/
Brasil
Idioma:
En
Ano de publicação:
2007
Tipo de documento:
Article