HR: 1340h
AN: A53C-0905    [Abstracts]
TI: Selective Characterization of Benzo[a]pyrene Diones Using LC/MS/MS
AU: * Tostado, E
EM: etostado@uci.edu
AF: California State University, Los Angeles, 5151 State University Drive, Los Angeles, CA 90032
AU: Ramos, N
EM: nramos3@calstatela.edu
AF: California State University, Los Angeles, 5151 State University Drive, Los Angeles, CA 90032
AU: Ramos, N
EM: nramos3@calstatela.edu
AF: CEA-CREST Program, 5151 State University Drive, Los Angeles, CA 90032
AU: Lee, M E
EM: marylee@mit.edu
AF: California State University, Los Angeles, 5151 State University Drive, Los Angeles, CA 90032
AU: Ivey, M M
EM: michelle$_$ivey@HMC.edu
AF: California State University, Los Angeles, 5151 State University Drive, Los Angeles, CA 90032
AU: Foster, K L
EM: kfoster@exchange.calstatela.edu
AF: California State University, Los Angeles, 5151 State University Drive, Los Angeles, CA 90032
AU: Foster, K L
EM: kfoster@exchange.calstatela.edu
AF: CEA-CREST Program, 5151 State University Drive, Los Angeles, CA 90032
AB: Benzo[a]pyrene (B[a]P) is a known carcinogenic pollutant emitted into the atmosphere as a result of incomplete combustion. Its major photolysis products are B[a]P-1,6-dione, B[a]P-3,6-dione, and B[a]P-6,12-dione. The diones are functionalized polycyclic aromatic hydrocarbons (PAHs) with substituent oxygen atoms attached to them. The Environmental Protection Agency (EPA) has also categorized the compounds as possible carcinogens. Furthermore, the inherent polarity of the compounds make them mobile throughout the environment. Previous studies show standards of B[a]P and B[a]P-3,6-dione, B[a]P-1,6-dione and B[a]P-6,12-dione being successfully separated using high performance liquid chromatography coupled to atmospheric pressure chemical ionization (LC/APCI-MS), with mass-to-charge ratios (m/z) of 252 and 283, respectively. This paper will discuss further advances in the characterization of B[a]P diones achieved by employing LC/APCI-MS/MS technique. This further confirms the presence of B[a]P diones by yielding a unique daughter fragment with m/z of 255, which corresponds to the loss of a C=O group from the parent dione. The experiments have been confirmed by utilizing theoretical molecular modeling with Spartan (Wavefunction, Inc.). The implication of these results on the field of tropospheric photochemistry will be discussed.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0317 Chemical kinetic and photochemical properties
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting