The aim of this study was to achieve a method to perform detailed characterization and human exposure studies of nanosized and nanostructured aerosol particles. The source chosen was mild steel, active gas, arc welding fume. The setup consisted of a generation chamber, where welding
can be performed, connected to an airtight stainless steel 22 m3 exposure chamber. Instrumentation, consisting of a tapered element oscillating microbalance, a scanning mobility particle sizer, and a sampler for electron microscopy and particle-induced X-ray emission analysis
was connected to the stainless steel chamber. The feasibility of the system for human exposure studies was evaluated by exposing 31 human volunteers, in groups of three, to a test aerosol containing 1 mg/m3 welding fumes and to conditioned, filtered air. The results show that
an aerosol that accurately represents dilute welding fume exposures that occur in workplaces can be produced in a controlled manner, and that the experimental setup can be used for 6 h, double-blind, exposures of human subjects. Particle mass concentration levels could be varied from
<5 μg/m3 to more than 1000 μg/m3. Fumes from metal active gas welding showed a unimodal size distribution with a mean mobility diameter of 160 nm, transmission electron microscopy showed aggregates with a clearly nanosized structure.
2013 American Association for Aerosol Research
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Document Type: Research Article
Department of Design Sciences,Ergonomics and Aerosol Technology, Lund University, Lund, Sweden
Department of Medicine, Occupational and Environmental Medicine,Lund University, Lund, Sweden
Department of Medicine,Huddinge, Karolinska Institutet, Stockholm, Sweden
Department of Physics, Solid State Physics,Lund University, Lund, Sweden
Publication date: 2013-01-01
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