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Dive into the research topics where Ana Sofia Fonseca is active.

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Featured researches published by Ana Sofia Fonseca.


Science of The Total Environment | 2016

Process-generated nanoparticles from ceramic tile sintering: Emissions, exposure and environmental release

Ana Sofia Fonseca; Androniki Maragkidou; M. Viana; Xavier Querol; Kaarle Hämeri; I. de Francisco; C. Estepa; C. Borrell; V. Lennikov; G.F. de la Fuente

The ceramic industry is an industrial sector in need of significant process changes, which may benefit from innovative technologies such as laser sintering of ceramic tiles. Such innovations result in a considerable research gap within exposure assessment studies for process-generated ultrafine and nanoparticles. This study addresses this issue aiming to characterise particle formation, release mechanisms and their impact on personal exposure during a tile sintering activity in an industrial-scale pilot plant, as a follow-up of a previous study in a laboratory-scale plant. In addition, possible particle transformations in the exhaust system, the potential for particle release to the outdoor environment, and the effectiveness of the filtration system were also assessed. For this purpose, a tiered measurement strategy was conducted. The main findings evidence that nanoparticle emission patterns were strongly linked to temperature and tile chemical composition, and mainly independent of the laser treatment. Also, new particle formation (from gaseous precursors) events were detected, with nanoparticles <30nm in diameter being formed during the thermal treatment. In addition, ultrafine and nano-sized airborne particles were generated and emitted into workplace air during sintering process on a statistically significant level. These results evidence the risk of occupational exposure to ultrafine and nanoparticles during tile sintering activity since workers would be exposed to concentrations above the nano reference value (NRV; 4×10(4)cm(-3)), with 8-hour time weighted average concentrations in the range of 1.4×10(5)cm(-3) and 5.3×10(5)cm(-3). A potential risk for nanoparticle and ultrafine particle release to the environment was also identified, despite the fact that the efficiency of the filtration system was successfully tested and evidenced a >87% efficiency in particle number concentrations removal.


Science of The Total Environment | 2018

Dip coating of air purifier ceramic honeycombs with photocatalytic TiO2 nanoparticles: A case study for occupational exposure

Antti J. Koivisto; Kirsten I. Kling; Ana Sofia Fonseca; Anders Brostrøm Bluhme; Marcel Moreman; Mingzhou Yu; Anna Luisa Costa; Baldi Giovanni; Simona Ortelli; Wouter Fransman; Ulla Vogel; Keld Alstrup Jensen

Nanoscale TiO2 (nTiO2) is manufactured in high volumes and is of potential concern in occupational health. Here, we measured workers exposure levels while ceramic honeycombs were dip coated with liquid photoactive nanoparticle suspension and dried with an air blade. The measured nTiO2 concentration levels were used to assess process specific emission rates using a convolution theorem and to calculate inhalation dose rates of deposited nTiO2 particles. Dip coating did not result in detectable release of particles but air blade drying released fine-sized TiO2 and nTiO2 particles. nTiO2 was found in pure nTiO2 agglomerates and as individual particles deposited onto background particles. Total particle emission rates were 420×109min-1, 1.33×109μm2min-1, and 3.5mgmin-1 respirable mass. During a continued repeated process, the average exposure level was 2.5×104cm-3, 30.3μm2cm-3, <116μgm-3 for particulate matter. The TiO2 average exposure level was 4.2μgm-3, which is well below the maximum recommended exposure limit of 300μgm-3 for nTiO2 proposed by the US National Institute for Occupational Safety and Health. During an 8-hour exposure, the observed concentrations would result in a lung deposited surface area of 4.3×10-3cm2g-1 of lung tissue and 13μg of TiO2 to the trachea-bronchi, and alveolar regions. The dose levels were well below the one hundredth of the no observed effect level (NOEL1/100) of 0.11cm2g-1 for granular biodurable particles and a daily no significant risk dose level of 44μgday-1. These emission rates can be used in a mass flow model to predict the impact of process emissions on personal and environmental exposure levels.


Archive | 2015

Workplace Exposure to Process-Generated Ultrafine and Nanoparticles in Ceramic Processes Using Laser Technology

Ana Sofia Fonseca; M. Viana; Xavier Querol; N. Moreno; I. de Francisco; C. Estepa; G.F. de la Fuente

The ceramic industry is an industrial sector, which has been growing and including innovative technologies such as laser processes. However, there is a considerable research gap within exposure assessment studies for process-generated ultrafine and nanoparticles, especially as a result of such innovations in the manufacturing processes.


Annals of Occupational Hygiene | 2015

Characterization of Exposure to Carbon Nanotubes in an Industrial Setting

Ana Sofia Fonseca; Anna-Kaisa Viitanen; Antti J. Koivisto; Annelli Kangas; Marika Huhtiniemi; Tareq Hussein; Esa Vanhala; Mar Viana; Xavier Querol; Kaarle Hämeri


Journal of Aerosol Science | 2015

Ultrafine and nanoparticle formation and emission mechanisms during laser processing of ceramic materials

Ana Sofia Fonseca; M. Viana; Xavier Querol; N. Moreno; I. de Francisco; C. Estepa; G.F. de la Fuente


Journal of Nanoparticle Research | 2018

Particle release and control of worker exposure during laboratory-scale synthesis, handling and simulated spills of manufactured nanomaterials in fume hoods

Ana Sofia Fonseca; Eelco Kuijpers; Kirsten I. Kling; Marcus Levin; Antti J. Koivisto; Signe H. Nielsen; Wouter Fransman; Yijri Fedutik; Keld Alstrup Jensen; Ismo K. Koponen


NanoImpact | 2018

Occupational exposure during handling and loading of halloysite nanotubes – A case study of counting nanofibers

Antti J. Koivisto; Anders Brostrøm Bluhme; Kirsten I. Kling; Ana Sofia Fonseca; Emile Redant; Flavia Andrade; Karin Sørig Hougaard; Maksym Krepker; Ofer Setter Prinz; Ester Segal; Andreas Holländer; Keld Alstrup Jensen; Ulla Vogel; Ismo K. Koponen


New tools and approaches for nanomaterial safety assessment 2017 | 2017

Goodness of dustiness index for predicting human exposure to airborne nanomaterials

Ana Sofia Fonseca; Antti J. Koivisto; Ismo K. Koponen; Alexander C. Ø. Jensen; Kirsten I. Kling; Marcus Levin; Aiga Mackevica; Martie van Tongeren; Araceli Sanchez; Wouter Fransman; Steffen Foss Hansen; Keld A. Jensen


Occupational Safety – Science and Practice | 2016

Narażenie na nanocząstki w środowisku pracy w procesach ceramicznych wykorzystujących technologię laserową

Ana Sofia Fonseca; M. Viana; Xavier Querol; N. Moreno; I. de Francisco; C. Estepa; G.F. de la Fuente


Archive | 2014

Nanoparticle exposure during laser irradiation of ceramic tiles in an industrial setting

Mar Viana; Ana Sofia Fonseca; Xavier Querol; I. de Francisco; L. C. Estepa; Germán F. de la Fuente

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I. de Francisco

Spanish National Research Council

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C. Estepa

Spanish National Research Council

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G.F. de la Fuente

Spanish National Research Council

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M. Viana

Spanish National Research Council

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Mar Viana

Spanish National Research Council

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N. Moreno

Spanish National Research Council

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Keld Alstrup Jensen

National Institute of Occupational Health

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