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Applying open-path FTIR with a bi-beam strategy to evaluate personal exposure in indoor environments: experimental results of a validation study.

Authors
Wu-CF; Yost-MG; Varr-J; Hashmonay-RA
Source
Am Ind Hyg Assoc J 2003 Mar/Apr; 64(2):181-188
NIOSHTIC No.
20029274
Abstract
This study evaluated the performance and feasibility of using open-path Fourier transform infrared (OP-FTIR) with a bi-beam strategy to assess personal exposures in workplaces. The bi-beam strategy combines a long beam and a short beam measurement to calculate the average concentration level of the segmented region. A series of experiments was conducted with six human subjects at two workstations inside a chamber. A bi-beam geometry was set up for each workstation. Each subject repeatedly performed two tasks (9 min/task), which were designed to simulate a painting and an assembly task. For each task a tracer gas (N(2)O) was released from a point source near the subject. During each task, while the OP-FTIR collected the N(2)O spectrum, bag samples were collected simultaneously at nose and lapel height. Statistical data analysis applied a general linear model with the bag samples as the dependent variable. Results show that the locations, tasks, and subjects are not significant factors when using OP-FTIR measurements with the bi-beam strategy to estimate personal exposure at the nose height. The model used in this study fits the data reasonably well (R(2)=0.87), and when it is compared with a second set of experimental data, the bias is 0.7 ppm (3%) and the precision is 5.5 ppm. This study demonstrates that the bi-beam sampling strategy may offer a new approach for applying OP-FTIR to industrial hygiene monitoring.
Keywords
Environmental-health-monitoring; Humans; Models; Occupational-exposure; Occupational-health; Simulation-methods; Statistical-analysis; Author Keywords: beam geometry; gamma model; open-path FTIR; personal exposure
Contact
Department of Environmental Health, University of Washington, Seattle, WA 98195, USA
CODEN
AIHAAP
Publication Date
20030301
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2003
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-002660
Issue of Publication
2
ISSN
0002-8894
Source Name
American Industrial Hygiene Association Journal
State
WA
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