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

Conference · Sun Aug 26 04:00:00 EDT 1990

OSTI ID:5528333

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

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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). Earth System Research Laboratory

Determination of carbonyl compounds in the ambient atmosphere is receiving increasing attention because of the critical role these compounds play as pollutants and as key participants in tropospheric photochemistry. Carbonyls are involved in photochemical reactions as products of the oxidation of hydrocarbons, precursors of oxidants including ozone and peroxycarboxylic nitric anhydrides (PANs), and as sources of free radicals and organic aerosols. Formation of carbonyls in the atmosphere and in internal combustion engines proceeds through analogous channels and the mechanisms are dealt with in several recent reviews. The series of reactions is initiated by the formation of a carbon-centered radical (R•), usually through reaction of hydroxyl radical (OH•) with a hydrocarbon, although photolysis of labile compounds (such as another carbonyl), or reaction with nitrate radical (NO₃•) is also possible. Reactions of OH•, O₃ or NO₃• with alkenes proceed through addition to the double bond, forming a carbon centered radical on the adjacent carbon. In addition to the in situ photochemical generation, a number of carbonyls are emitted directly in auto exhaust, and a variety of both anthropogenic and biogenic sources. In this regard, there is a potential for increased carbonyl emissions resulting from changes in technology such as use of methanol, ethanol etc. as gasolene substitutes.

• 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: 5528333
• Report Number(s): BNL--46240; CONF-9008162--2; ON: DE91015147
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
54 ENVIRONMENTAL SCIENCES
540110*
AIR POLLUTION
AIR POLLUTION MONITORING
ATMOSPHERIC CHEMISTRY
CARBONYLS
CHEMICAL REACTIONS
CHEMISTRY
CHROMATOGRAPHY
EARTH ATMOSPHERE
LIQUID COLUMN CHROMATOGRAPHY
PHOTOCHEMICAL REACTIONS
POLLUTION
SAMPLING
SEPARATION PROCESSES
TROPOSPHERE