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Deposition of fiber in the human nasal airway.

Authors
Su-W-C; Cheng-YS
Source
Aerosol Sci Tech 2005 Sep; 39(9):888-901
NIOSHTIC No.
20044488
Abstract
Inhalation is the main route for aerosol entering the human body. Many occupational lung diseases are associated with exposure to fiber aerosol in the workplace. However, very few studies to date have been conducted for investigating fiber deposition in the human airway. As a result, there is a notable lack of information on the nature of the fiber deposition pattern in the human respiratory tract. With this in mind, this research consisted of a large number of experimental works to investigate the effects of fiber dimension on the deposition pattern for a human nasal airway. Carbon fibers with uniform diameter (3.66 um) and polydispersed length were adopted as the test material. Deposition studies were conducted by delivering aerosolized carbon fibers into a nasal airway replica (encompassing the nasal airway regions from vestibule to nasopharynx) at constant inspiratory flow rates of 7.5, 15, 30, and 43.5 l/min. Fibers deposited in each nasal airway region were washed out and the length distribution was determined by microscopic measurement. The results showed that impaction is the dominant deposition mechanism. Most of the fibers with high inertia deposited in the anterior region of the nasal airway (vestibule and nasal valve). In contrast, fibers with low inertia were found to pass through the entire nasal airway easily and collected on the filter at the outlet. Comparing the deposition results between fibers and spherical particles, our data showed that the deposition efficiencies of fibers are significantly lower than that of spherical particles, which implies that the inhaled fibers could pass through the entire nasal airway comparatively easier than spherical particles. Thus, relatively more fibers would be able to enter the lower respiratory tract.
Keywords
Aerosols; Aerosol-particles; Fibrous-dusts; Inhalants; Airborne-fibers; Air-sampling; Exposure-levels; Risk-factors; Asbestos-fibers; Asbestos-dust; Particulates; Analytical-processes; Models; Air-flow; Respiratory-irritants; Respiratory-rate; Nasal-cavity; Lungs; Lung-disease; Humans
Contact
Wei-Chung Su, Lovelace Respiratory Research Institute, 2425 Ridgecrest Drive, SE, Albuquerque, NewMexico 87108, USA
CODEN
ASTYDQ
Publication Date
20050901
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003900
Issue of Publication
9
ISSN
0278-6826
Source Name
Aerosol Science and Technology
State
NM
Performing Organization
Lovelace Biomedical & Environmental Research, Albuquerque, New Mexico
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