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Evaluation of IOM personal sampler at different flow rates.

Authors
Zhou-Y; Cheng-YS
Source
J Occup Environ Hyg 2010 Feb; 7(2):88-93
NIOSHTIC No.
20036303
Abstract
The Institute of Occupational Medicine (IOM) personal sampler is usually operated at a flow rate of 2.0 L/min, the rate at which it was designed and calibrated, for sampling the inhalable mass fraction of airborne particles in occupational environments. In an environment of low aerosol concentrations only small amounts of material are collected, and that may not be sufficient for analysis. Recently, a new sampling pump with a flow rate up to 15 L/min became available for personal samplers, with the potential of operating at higher flow rates. The flow rate of a Leland Legacy sampling pump, which operates at high flow rates, was evaluated and calibrated, and its maximum flow was found to be 10.6 L/min. IOM samplers were placed on a mannequin, and sampling was conducted in a large aerosol wind tunnel at wind speeds of 0.56 and 2.22 m/s. Monodisperse aerosols of oleic acid tagged with sodium fluorescein in the size range of 2 to 100 microm were used in the test. The IOM samplers were operated at flow rates of 2.0 and 10.6 L/min. Results showed that the IOM samplers mounted in the front of the mannequin had a higher sampling efficiency than those mounted at the side and back, regardless of the wind speed and flow rate. For the wind speed of 0.56 m/s, the direction-averaged (the average value of all orientations facing the wind direction) sampling efficiency of the samplers operated at 2.0 L/min was slightly higher than that of 10.6 L/min. For the wind speed of 2.22 m/s, the sampling efficiencies at both flow rates were similar for particles < 60 microm. The results also show that the IOM's sampling efficiency at these two different flow rates follows the inhalable mass curve for particles in the size range of 2 to 20 microm. The test results indicate that the IOM sampler can be used at higher flow rates. Erratum:
Keywords
Airborne-particles; Air-contamination; Air-filters; Air-flow; Air-monitoring; Air-quality; Air-sampling; Air-sampling-techniques; Inhalation-studies; Laboratory-testing; Monitoring-systems; Particle-counters; Particulate-sampling-methods; Qualitative-analysis; Sampling; Sampling-equipment; Sampling-methods; Statistical-analysis; Statistical-quality-control; Author Keywords: flow rate; IOM; personal sampler
Contact
Yue Zhou, Lovelace Respiratory Research Institute, 2425 Ridgecrest Dr., SE, Albuquerque, NM 87108
CODEN
JOEHA2
Publication Date
20100201
Document Type
Journal Article
Email Address
yzhou@lrri.org
Funding Type
Grant
Fiscal Year
2010
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008913
Issue of Publication
2
ISSN
1545-9624
Source Name
Journal of Occupational and Environmental Hygiene
State
NM
Performing Organization
Lovelace Biomedical & Environmental Research
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