Record Display for the EPA National Library Catalog


Main Title 2,4-Dinitrophenylhydrazine-Coated Silica Gel Cartridge Method for Determination of Formaldehyde in Air: Identification of an Ozone Interference.
Author Arnts, R. R. ; Tejada, S. B. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/286;
Stock Number PB90-196676
Additional Subjects Ozone ; Chemical analysis ; Formaldehyde ; Silica gel ; Liquid chromatography ; Chemical reactions ; Dinitrophenylhydrazine
Library Call Number Additional Info Location Last
NTIS  PB90-196676 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 5p
Two versions of the 2,4-dinitrophenylhydrazine method, a coated silica gel cartridge (solid) and acetonitrile impinger (solvent based), were used simultaneously to sample varied concentrations of ozone (0-770 ppb) and formaldehyde (20-140 ppb). Ozone was found to be a negative interference in the determination of formaldehyde by the 2,4-dinitrophenylhydrazine-coated silica gel cartridge method. At 120 ppb of ozone, formaldehyde at 40 ppb was under-reported by the cartridge method by 34% and at 300 ppb of ozone, formaldehyde measurements were 61% low. Greater losses were seen at higher ozone concentrations. Impinger sampling (2,4-DNPH in acetonitrile) showed no formaldehyde losses due to ozone.