The aim of this study was to estimate the contribution of submicronic (PM1) and coarse (PM > 1) particulate matter deposition to the heavy metal load of lichens exposed along a busy road, based on the assumption that the accumulation of heavy metals occurs mostly as particles. We tested the hypothesis that lichens exposed inside a nylon cover with mesh size of 1 μm accumulate less heavy metals than lichens exposed without any cover. To this purpose, thalli of the lichen Evernia prunastri were transplanted for three months along a busy road of the urban area of Siena (Central Italy), with half of the samples exposed inside a nylon cover with a mesh size of 1 μm. The content of Al, As, Cd, Cr, Cu, Fe, Ni, Pb, Sb, and Zn was measured by ICP-MS before and after the exposure. The results showed that samples exposed inside the nylon cover accumulated a lower amount of most chemical elements and that Sb, along with Cd and Cu were the main traffic-related elements in the study area. Differences in element uptake were not caused by differences in sample vitality caused by the experimental procedure. Using a conversion factor it was possible to estimate element deposition rates for PM1 and PM > 1.

Vannini, A., Paoli, L., Russo, A., Loppi, S. (2019). Contribution of submicronic (PM1) and coarse (PM>1) particulate matter deposition to the heavy metal load of lichens transplanted along a busy road. CHEMOSPHERE, 231, 121-125 [10.1016/j.chemosphere.2019.05.085].

Contribution of submicronic (PM1) and coarse (PM>1) particulate matter deposition to the heavy metal load of lichens transplanted along a busy road

Vannini, Andrea;Paoli, Luca;RUSSO, ALESSIO;Loppi, Stefano
2019-01-01

Abstract

The aim of this study was to estimate the contribution of submicronic (PM1) and coarse (PM > 1) particulate matter deposition to the heavy metal load of lichens exposed along a busy road, based on the assumption that the accumulation of heavy metals occurs mostly as particles. We tested the hypothesis that lichens exposed inside a nylon cover with mesh size of 1 μm accumulate less heavy metals than lichens exposed without any cover. To this purpose, thalli of the lichen Evernia prunastri were transplanted for three months along a busy road of the urban area of Siena (Central Italy), with half of the samples exposed inside a nylon cover with a mesh size of 1 μm. The content of Al, As, Cd, Cr, Cu, Fe, Ni, Pb, Sb, and Zn was measured by ICP-MS before and after the exposure. The results showed that samples exposed inside the nylon cover accumulated a lower amount of most chemical elements and that Sb, along with Cd and Cu were the main traffic-related elements in the study area. Differences in element uptake were not caused by differences in sample vitality caused by the experimental procedure. Using a conversion factor it was possible to estimate element deposition rates for PM1 and PM > 1.
Vannini, A., Paoli, L., Russo, A., Loppi, S. (2019). Contribution of submicronic (PM1) and coarse (PM>1) particulate matter deposition to the heavy metal load of lichens transplanted along a busy road. CHEMOSPHERE, 231, 121-125 [10.1016/j.chemosphere.2019.05.085].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/1073756