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RECORD NUMBER: 237 OF 882

OLS Field Name OLS Field Data
Main Title Development of real-time monitors for gaseous formaldehyde /
Author Kelly, Thomas J. ; Barnes., R. H.
Other Authors
Author Title of a Work
Barnes, Russell H.
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 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 01/01/1988
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