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- Gudmundsson, Anders, et al.
(författare)
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Deposition of Airborne Particles onto the Human Eye - Wind Tunnel Studies of the Deposition Velocity onto the Eyes of a Mannequin
- 1997
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Ingår i: Journal of Aerosol Science. - 0021-8502. ; 28:6, s. 1085-1100
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Tidskriftsartikel (refereegranskat)abstract
- Abstract In the field of occupational hygiene much consideration is devoted to the uptake through the human airways, but there are also reports of irritations, complaints and hazards or potential hazards due to particle deposition onto the eyes. There is a need for data regarding the dependence of the deposition rate on particle size and environmental parameters in order to formulate sampling criteria and to find dose-response relations. The deposition of airborne particles onto the human eye was studied by making use of a dummy, the eyes of which were covered with pieces of transparent sticky foil. The dummy was exposed to airborne particles in a wind tunnel. The airborne particle concentration was simultaneously measured using an Aerodynamic Particle Sizer (APS, TSI Inc., U.S.A.). The deposited particles were counted using an optical microscope equipped with an image analyser. For the particle sizes (2–30 μm), wind velocities (0.5 and 1.0 m s−1), wind directions (0, 90 and 180°) and turbulence intensities (1.3 and 19%) employed in this study, deposition velocities onto the eyes were determined to be in the range of 0.001–1 cm s−1.
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- Gudmundsson, Anders, et al.
(författare)
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Particle Deposition on the Human Eye
- 1992
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Ingår i: Proceedings of Symposium of the Nordic Society of Aerosol Research 1992, Undersökningsrapport 1992:29, Arbetsmiljöinstitutet.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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| 6. |
- Schneider, Thomas, et al.
(författare)
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A Semiempirical model for Particle Deposition onto Facial Skin and Eyes. Role of Air Currents and Electric Fields
- 1994
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Ingår i: Journal of Aerosol Science. - 0021-8502. ; 25:3, s. 583-593
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Tidskriftsartikel (refereegranskat)abstract
- A semiempirical model has been developed for deposition velocity of particles on the forehead and eyes. It is based on published results of wind tunnel studies of deposition of 2-32 μm airborne particles onto the forehead and realistically-shaped eyes of a manikin. The effects of electric fields and particle charges were included in the model on a purely theoretical basis. The model was used to calculate the combined effects of air currents and electric fields, and it was found that electric fields and particle charges are major determinants for deposition of particles approximately 1 μm in diameter, and air turbulence likely to occur in ventilated rooms is a major determinant for particles larger than 10 μm. The model predicts that deposition of particles from typical indoor environments will be enhanced for persons exposed to electric fields, irrespective of the direction of the field. For a complete characterization, particle concentration, size distribution, mean air velocity, direction and turbulence intensity, electric fields and particle charge distribution should be known. For investigators of exposure to airborne particles and its relation to the office eye syndrome, the model can be used for identifying those parameters which are key for given conditions, thus simplifying the description of exposure.
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