Abstract
We report measurements of the size, concentration, and hygroscopicity of ultrafine particles (UFPs) emitted during thermal spraying of ceramic coatings in an industrial setting. High concentrations...
Highlights
Release of airborne particles in the workplace air has become an issue of growing concern with regard to worker exposure (Pietroiusti et al, 2018; Viitanen et al, 2017), as a result of the well-established adverse respiratory and cardiovascular impacts of ultrafine, fine and coarse particles (Oberdörster, 2001; World Health Organization, 2016; Gakidou et al, 2017; Landrigan, 2017)
High concentrations of process-generated ultrafine particles (UFPs), which were often higher than 106 cm-3, were monitored at an industrial workplace setting during thermal spraying inside the spraying booths of the studied facility
Emission patterns were irregular in the case of the Atmospheric Plasma Spraying (APS) and more uniform during High Velocity Oxy-Fuel (HVOF)
Summary
Release of airborne particles in the workplace air has become an issue of growing concern with regard to worker exposure (Pietroiusti et al, 2018; Viitanen et al, 2017), as a result of the well-established adverse respiratory and cardiovascular impacts of ultrafine, fine and coarse particles (Oberdörster, 2001; World Health Organization, 2016; Gakidou et al, 2017; Landrigan, 2017). Discriminating unintentionally-released UFPs – referred to as process-generated or incidental nanoparticles – from background aerosol particles using methods based on spatially or temporally distributed observations are already reported in the literature (Kuhlbusch et al, 2011, 2009; Schill and Chosewood, 2013; OECD, 2015; Asbach et al, 2016; Dahmann, 2016) Most of these methods employ instruments to quantify background and UFP sources in terms of aerosol metrics such as particle number or mass concentrations (Ono-Ogasawara et al, 2009; Peters et al, 2009; Asbach et al, 2012), but not based on intrinsic particle properties such as morphology. Transmission electron microscopy (TEM) grids were used to sample the emitted particles in order to verify that they had irregular shapes at dry conditions and to determine their chemical composition (using Energy Dissipative X-ray Spectroscopy; EDX)
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