A road dust sampling campaign was conducted on several streets of Florence:
– VIALE ETRURIA: traffic site with traffic flows from outside Florence (including heavy duty vehicles);
– VIA XI AGOSTO: traffic site with traffic flows from outside Florence (including heavy duty vehicles);
– VIALE STROZZI: urban traffic site (on the Florence main city ring);
– VIALE GRAMSCI: urban traffic site (on the Florence main city ring);
– VIALE UGO BASSI: urban low traffic site (residential road);
– VIA FIBONACCI: urban low traffic site (residential road).
The sampling device developed by IDAEA was used to collect PM10 samples.
Samples in Viale Etruria, Via XI Agosto and Viale Strozzi were collected on the 21st of November 2014, while samples in Viale Gramsci, Viale Ugo Bassi and Via Fibonacci were collected on the 28th of January, in both cases, after more than 48 h from the last street washing and rain episode.
In every sampling site, 3-4 samples were collected (1 on Teflon and 2-3 on quartz fibre filters) in different points of the right track (asphalted road). Each sample was collected for 15 min. over an area of 0.5 m2.
Samples collected on quarts fibre filters have been analysed by a thermal-optical method to obtain their carbonaceous content and by inductively coupled plasma techniques to get the elemental speciation.
Samples collected on Teflon filters have been analyzed by PIXE to obtain a second quantification of elemental concentrations, especially for soil related elements, which are very well detected by PIXE.
The “dust chemical profiles” will be useful to better estimate the contribution of resuspension to ambient PM10 levels.