PM and material decay: analysis of dry depositions on horizontal and vertical surrogate surfaces through a Deposition Box system

Guenoden, Laura (2017) PM and material decay: analysis of dry depositions on horizontal and vertical surrogate surfaces through a Deposition Box system. [Laurea magistrale], Università di Bologna, Corso di Studio in Chimica industriale [LM-DM270]
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Airborne Particulate Matter (PM), can get removed from the atmosphere through wet and dry mechanisms, and physically/chemically interact with materials and induce premature decay. The effect of dry depositions is a complex issue, especially for outdoor materials, because of the difficulties to collect atmospheric deposits repeatable in terms of mass and homogeneously distributed on the entire investigated substrate. In this work, to overcome these problems by eliminating the variability induced by outdoor removal mechanisms (e.g. winds and rainfalls), a new sampling system called ‘Deposition Box’, was used for PM sampling. Four surrogate materials (Cellulose Acetate, Regenerated Cellulose, Cellulose Nitrate and Aluminum) with different surfaces features were exposed in the urban-marine site of Rimini (Italy), in vertical and horizontal orientations. Homogeneous and reproducible PM deposits were obtained and different analytical techniques (IC, AAS, TOC, VP-SEM-EDX, Vis-Spectrophotometry) were employed to characterize their mass, dimension and composition. Results allowed to discriminate the mechanisms responsible of the dry deposition of atmospheric particles on surfaces with different nature and orientation and to determine which chemical species, and in which amount, tend to preferentially deposit on them. This work demonstrated that “Deposition Box” can represent an affordable tool to study dry deposition fluxes on materials and results obtained will be fundamental in order to extend this kind of exposure to actual building and heritage materials, to investigate the PM contribution in their decay.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Guenoden, Laura
Relatore della tesi
Correlatore della tesi
Corso di studio
Advanced Spectroscopy in Chemistry
Ordinamento Cds
Parole chiave
particulate matter dry depositions cultural heritage surface orientation chemical analyses surface analysis
Data di discussione della Tesi
10 Ottobre 2017

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