Atmospheric dispersion of pollutants in Sado estuary (Portugal) using biomonitors
Epiphytic lichen transplants and aerosol samplers were put together in the Setubal area, Portugal. They were analysed by Instrumental Neutron Activation Analysis (INAA) and Proton Induced X-ray Emission (PIXE). The lichen dataset pointed out nine factors. No relevant differentiation was found towards different positioning of the lichens. T-transplants were delayed towards F-transplants, and for both after 3 and 6 months the accumulation was as much as at 9th month. Direct rainfall protection favoured accumulation for a few elements only. The elemental accumulation in lichens depended more on temperature and humidity conditions. Aerosol data towards lichen database showed an excellent correlation.
Keywords: lichens, aerosols, epiphytic lichen transplants, PM25, PM10, nuclear techniques, source apportionment, air pollution, pollutants dispersion, Portugal, biomonitors, temperature, humidity, metal concentrations