Main Title |
Development of a breadboard CO2 laser photoacoustic toxic vapor monitor : project summary / |
Author |
Loper, G. L. ;
Corbin, R. C. ;
Takayama, M. L. ;
Clifton, R. A. ;
Gelbwachs, J. A. ;
|
Other Authors |
Author |
Title of a Work |
Loper, G. L., |
Corbin, R.C., |
Takayama, M.L., |
Clifton, R.A., |
Gelbwachs, Jerry A., |
Beck, S.M., |
Jackson, Merrill D., |
|
CORP Author |
Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab. |
Publisher |
U.S. Environmental Protection Agency, Air and Energy Engineering Research Laboratory, Center Environmental Research Information |
Year Published |
1988 |
Report Number |
EPA/600-S7-88-011 |
Stock Number |
PB93-222628 |
OCLC Number |
896391392 |
Subjects |
Air--Pollution--United States--Measurement ;
Detectors ;
Air--Pollution--Measurement
|
Additional Subjects |
Toxic substances ;
Air pollution monitors ;
Vapors ;
Hazardous materials ;
Air samplers ;
Photoacoustic spectrometers ;
Carbon dioxide lasers ;
Chemical analysis ;
Threshold limit values
|
Internet Access |
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
EJBD |
EPA 600-S7-88-011 |
In Binder |
Headquarters Library/Washington,DC |
12/18/2018 |
EKBD |
EPA-600/S7-88-011 |
|
Research Triangle Park Library/RTP, NC |
10/24/2017 |
ELBD ARCHIVE |
EPA 600-S7-88-011 |
In Binder Received from HQ |
AWBERC Library/Cincinnati,OH |
10/04/2023 |
NTIS |
PB93-222628 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
[2] pages ; 28 cm. |
Abstract |
The report describes the development of a breadboard version of CO2 laser photoacoustic detector. The CO2 laser photoacoustic technique has been demonstrated to be capable of detecting, with high specificity, a variety of toxic compounds a low parts-per-billion (ppb) levels in multicomponent air samples. The technique can be used for monitoring trace levels of various hazardous compounds in ambient air samples. |
Notes |
"EPA/600-S7-88-011." "November 1988." |
Contents Notes |
This report describes the development of a breadboard version of COb2s laser photoacoustic detector. The COb2s laser photoacoustic technique has been demonstrated to be capable of detecting, with high specificity, a variety of toxic compounds a low parts-per-billion (ppb) levels in multicomponent air samples. The technique can be used for monitoring trace levels of various hazardous compounds in ambient air samples. Key achievements during the program included: (1) The determination of COb2s laser absorption cross-section data or seven compounds of EPA concern that are volatile constituents of hazardous chemical waste. These data show that the laser photoacoustic method could detect these compounds in the ambient air at levels well below their most stringent threshold limit values. (2) the development of an acoustic-frequency-tracking device that allows the use of a resonant photoacoustic cell for the first time under field conditions of changing temperature and humidity. (3) The identification of nonadsorptive materials for use in air sampliong[sp] lines and for coating the cell's interior to minimize sample adsorption and reaction losses. (4) The development of a pyro-electronic device that automatically determines the wave-length of a COb2s laser transition. This device allows laser-wavelength selection to be under closed-loop control. (5) the placement of the breadboard detector under microcomputer control such that all wavelength selection and the calculation and display of the unknown concentrations of the gases in the air sample are automatic. (6) the analysis of laboratory-prepared air mixtures to determine the performance capability of the instrument. Experiments on the laboratory-prepared mixtures showed that the fully automatic breadboard instrument can detect hydrazine, a toxic rocket fuel used by the Air Force, at concentrations as low as 5 ppb in the presence of three interfering gases at concentrations as much as 600 times greater. |