Evaluation of silica-gel cartridges coated in situ with acidified 2,4-dinitrophenylhydrazine for sampling aldehydes and ketones in air
A procedure for coating in-situ silica in commercially available prepacked cartridges with 2,4-dinitrophenylhydrazine (DNPH) acidified with hydrochloric acid is described. The coated cartridge was compared with a validated DNPH impinger method for sampling organic carbonyl compounds (aldehydes and ketones) in diluted automotive exhaust emissions and in ambient air for subsequent analysis of the DNPH derivatives by high performance liquid chromatography. Qualitative and quantitative results show that the two sampling devices are equivalent. An unknown degradation product of acrolein has been tentatively identified as x-acrolein. The disappearance of acrolein in the analytical sample matrix correlated quantitatively almost on a mole-for-mole basis with the growth of x-acrolein. The sum of the concentration of acrolein and x-acrolein appears to be invariant with time. This sum could possibly be used as a more-accurate value of the concentration of acrolein in the integratated sample.
- Research Organization:
- Environmental Protection Agency, Research Triangle Park, NC (USA). Atmospheric Sciences Research Lab.
- OSTI ID:
- 6503928
- Report Number(s):
- PB-87-169637/XAB; EPA-600/J-86/215
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330700 -- Advanced Propulsion Systems-- Emission Control
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACROLEIN
ADSORBENTS
AIR POLLUTION
ALDEHYDES
CHEMICAL ANALYSIS
ENGINES
EXHAUST GASES
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
KETONES
ORGANIC COMPOUNDS
PERFORMANCE
POLLUTION
SAMPLING
SILICA GEL
WASTES