| Main Title |
Development of real-time monitors for gaseous formaldehyde / |
| Author |
Kelly, Thomas J. ;
Barnes., R. H.
|
| Other Authors |
|
| CORP Author |
Battelle, Columbus, OH.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. |
| Publisher |
U.S. Enironmental Protection Agency, Atmospheric Research and Exposure Assessment Laboratory, |
| Year Published |
1990 |
| Report Number |
EPA/600/3-90/088; EPA-68-02-4127 |
| Stock Number |
PB91-126029 |
| Subjects |
Air--Pollution--Measurement ;
Formaldehyde--Measurement
|
| Additional Subjects |
Formaldehyde ;
Scrubbers ;
Chemical reactions ;
Solutions ;
Monitors ;
Spectroscopic analysis ;
Field tests ;
Tables(Data) ;
Graphs(Charts) ;
Fluorescence spectroscopy ;
Air pollution monitoring ;
Air sampling ;
DinitrophenyThydrazine ;
Laboratory tests ;
Prototypes
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB91-126029 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
93 pages ; 28 cm |
| Abstract |
Two new methods for real-time measurement of gaseous formaldehyde have been developed. One is a spectroscopic method based on direct fluorescence detection of gaseous formaldehyde following excitation with UV light. This method has been developed to the prototype stage by modifications of a commercial fluorescence SO2 detector to convert it to formaldehyde detection. The prototype spectroscopic formaldehyde monitor exhibits a detection limit of <30 ppbv, with a time response of about one minute. The second method is based on derivatization of formaldehyde in aqueous solution to form a fluorescent product. The detection of fluorescent product was made more sensitive by using intense 254 nm light from a mercury lamp for excitation, thereby allowing use of a simple and efficient glass coil scrubber for collection of gaseous formaldehyde. The wet chemical formaldehyde monitor incorportating these improvements exhibits a detection limit for gaseous formaldehyde of 0.2 ppbv and for aqueous formaldehyde of 0.2 micromolar with time response of about one minute, following a lag time of 2 minutes. Both instruments were tested in the laboratory with gaseous formaldehyde standards, and the aqueous scrubbing/analysis method was field tested by continuous operation over a 10-day period in which outdoor and indoor air were sampled for alternate half-hour periods. A comparison of real-time (aqueous scrubbing/analysis) and integrated measurements, using dinitrophenylhydrazine (DNPH) impingers, showed close agreement between the real-time and DNPH data, even at concentrations as low as 1 ppbv. |
| Notes |
"EPA/600/3-90/088." "November 1990." Microfiche. |
| Place Published |
{Research Triangle Park, NC} : |
| Supplementary Notes |
Sponsored by Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. |
| Corporate Au Added Ent |
Atmospheric Research and Exposure Assessment Laboratory. |
| PUB Date Free Form |
1990. |
| NTIS Prices |
PC A05/MF A01 |
| BIB Level |
m |
| Cataloging Source |
OCLC/T |
| OCLC Time Stamp |
20001220172811 |
| Language |
eng |
| Origin |
NTIS |
| Type |
MERGE |
| OCLC Rec Leader |
01086nam 2200277Ka 45020 |
