2,4 - dinitrophenylhydrazine - coated silica gel cartridge method for determination of formaldehyde in air: Identification of an ozone interference
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.
- Research Organization:
- Environmental Protection Agency, Research Triangle Park, NC (USA). Atmospheric Research and Exposure Assessment Lab.
- OSTI ID:
- 6899233
- Report Number(s):
- PB-90-196676/XAB; EPA--600/J-89/286
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ACCURACY
ADSORBENTS
AIR SAMPLERS
ALDEHYDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHROMATOGRAPHY
ECOLOGICAL CONCENTRATION
EQUIPMENT
FORMALDEHYDE
INTERFERENCE
LIQUID COLUMN CHROMATOGRAPHY
MEASURING METHODS
ORGANIC COMPOUNDS
OZONE
PHOTOCHEMICAL REACTIONS
SAMPLERS
SEPARATION PROCESSES
SILICA GEL