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Final report. Design and calibration of a low flow parallel stage impactor.

Authors
Esmen-NA; Weyel-DA; Tuchman-DP
Source
Yale University, New Haven, Connecticut, 1983 Dec; :1-70
Link
NIOSHTIC No.
00148514
Abstract
The design and calibration of a miniature parallel stage impactor was described. The impactor was constructed primarily of aluminum, out of a 3 by 1.5 by 12 inch rectangular block, and contained 6 sintered brass impactor stages. One stage was intended for collecting total air particulates. The other stages had cut off diameters of 0.47, 0.75, 1.90, 3.12, and 7.43 microns. Critical orifice needle valves were used. The valve assemblies were constructed of stainless steel. The instrument was calibrated with a uranine test aerosol at an air flow rate of 700 cubic centimeters per minute. The observed 50 percent cut off aerodynamic equivalent diameters for the first five stages were 0.47, 0.75, 1.90, 3.12, and 7.43 microns. The corresponding theoretical values were 0.38, 0.72, 1.80, 3.10, and 7.40 microns, respectively. The authors conclude that the parallel stage impactor is a reliable instrument. Parallel stage impactors can be miniaturized successfully and do not present any new disadvantages other than those that are inherent to any impactor device.
Keywords
NIOSH-Grant; Quantitative-analysis; Microscopy; Chemical-analysis; Aerosol-sampling; Air-monitoring; Air-quality; Trace-analysis; Metals; Analytical-instruments
Publication Date
19831201
Document Type
Final Grant Report
Funding Type
Grant
Fiscal Year
1984
NTIS Accession No.
PB85-243012
NTIS Price
A05
Identifying No.
Grant-Number-R01-OH-01228
NIOSH Division
OEP
Source Name
Yale University, New Haven Connecticut
State
CT
Performing Organization
Dermatology Yale University Post Office Box 3333 New Haven, Conn 06510
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