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RECORD NUMBER: 67 OF 309

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.