Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/149539
Author(s): Viana, M
Salmatonidis, A
Bezantakos, S
Ribalta, C
Moreno, N
Córdoba, P
Cassee, FR
Boere, J
Fraga, S
Teixeira, JP
Bessa, MJ
Monfort, E
Title: Characterizing the Chemical Profile of Incidental Ultrafine Particles for Toxicity Assessment Using an Aerosol Concentrator
Publisher: Oxford University Press
Issue Date: 2021
Abstract: Incidental ultrafine particles (UFPs) constitute a key pollutant in industrial workplaces. However, characterizing their chemical properties for exposure and toxicity assessments still remains a challenge. In this work, the performance of an aerosol concentrator (Versatile Aerosol Concentration Enrichment System, VACES) was assessed to simultaneously sample UFPs on filter substrates (for chemical analysis) and as liquid suspensions (for toxicity assessment), in a high UFP concentration scenario. An industrial case study was selected where metal-containing UFPs were emitted during thermal spraying of ceramic coatings. Results evidenced the comparability of the VACES system with online monitors in terms of UFP particle mass (for concentrations up to 95 µg UFP/m3) and between filters and liquid suspensions, in terms of particle composition (for concentrations up to 1000 µg/m3). This supports the applicability of this tool for UFP collection in view of chemical and toxicological characterization for incidental UFPs. In the industrial setting evaluated, results showed that the spraying temperature was a driver of fractionation of metals between UF (<0.2 µm) and fine (0.2-2.5 µm) particles. Potentially health hazardous metals (Ni, Cr) were enriched in UFPs and depleted in the fine particle fraction. Metals vaporized at high temperatures and concentrated in the UF fraction through nucleation processes. Results evidenced the need to understand incidental particle formation mechanisms due to their direct implications on particle composition and, thus, exposure. It is advisable that personal exposure and subsequent risk assessments in occupational settings should include dedicated metrics to monitor UFPs (especially, incidental).
Subject: metal nanoparticles
morphology
nanoparticles
new particle formation
occupational
versatile aerosol concentrator
workplace
URI: https://hdl.handle.net/10216/149539
Source: Ann Work Expo Health. 2021 Oct 9;65(8):966-978
Document Type: Artigo em Revista Científica Internacional
Rights: openAccess
License: https://creativecommons.org/licenses/by-nc-nd/4.0/
Appears in Collections:ISPUP - Artigo em Revista Científica Internacional

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