Sampling of atmospheric carbonyl compounds for determination by liquid chromatography after 2,4-dinitrophenylhydrazine labelling

Conference · Sat Jun 01 00:00:00 EDT 1991

OSTI ID:5468084

Vairavamurthy, A; Roberts, J M; Newman, L

Carbonyl compounds are both primary (directly emitted) and secondary (formed in situ) atmospheric species, which play a major role in tropospheric photochemistry. Because of trace concentrations (parts-per-billion and lower), ambient air measurements of carbonyls pose serious analytical problems. Generally, chromatographic approaches combined with chemical derivatization have been used to enhance sensitivity and selectivity in analysis. Currently, the liquid chromatographic method coupled to 2,4-dinitrophenylhydrazine derivatization (DNPH-LC) is in widespread use. Interferences arising from similar compounds are greatly minimized by chromatographic separation; however, those in the air sampling step, especially with ozone, continue to be problematic and remain to be resolved. We discuss here the different sampling techniques used for time-integrated collection of carbonyls in the DNPH-LC methods. Emphasis is placed on addressing: (1) the principles, advantages, and limitations of sampling techniques; (2) problems associated with reagent blank and sampling instrument; and (3) effects of atmospheric co-pollutants, especially ozone. 58 refs., 8 figs., 3 tabs.

• Research Organization: Brookhaven National Lab., Upton, NY (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5468084
• Report Number(s): BNL-46240-Rev.; CONF-9008162-2-Rev.; ON: DE91015842
• Resource Relation: Conference: Symposium on measurement of airborne compounds: sampling, analysis, and data interpretation, Washington, DC (United States), 26-31 Aug 1990
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBONYLS
LIQUID COLUMN CHROMATOGRAPHY
POLLUTANTS
ATMOSPHERIC CHEMISTRY
AIR POLLUTION
AIR POLLUTION MONITORING
CHEMICAL ANALYSIS
LABELLING
OZONE
PHOTOCHEMISTRY
SAMPLING
TROPOSPHERE
CHEMISTRY
CHROMATOGRAPHY
EARTH ATMOSPHERE
MONITORING
POLLUTION
SEPARATION PROCESSES
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)
400102 - Chemical & Spectral Procedures