Sampling of Atmospheric Carbonyl Compounds for Determination by Liquid Chromatography After 2,4-Dinitrophenylhydrazine Labelling

Conference · Fri Feb 01 04:00:00 EST 1991

OSTI ID:5468084

Vairavamurthy, Appathurai ^[1]; Roberts, James M. ^[2]; Newman, Leonard ^[1]

---

1. Brookhaven National Laboratory (BNL), Upton, NY (United States)
2. Brookhaven National Laboratory (BNL), Upton, NY (United States); National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States)

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.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5468084
• Report Number(s): BNL-46240-Rev.; CONF-9008162--2-Rev.; ON: DE91015842
• Country of Publication: United States
• Language: English

Related Subjects

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