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Citronellal reactions with ozone and OH radical: rate constants and gas-phase products detected using PFBHA derivatization.

Authors
Harrison-JC; Ham-JE; Wells-JR
Source
Atmos Environ 2007 Jul; 41(21):4482-4491
NIOSHTIC No.
20032326
Abstract
The bimolecular rate constants, kOH+citronellal, (15040)10-12 cm3 molecule-1 s-1 and, kO3+citronellal, (3.51.2)10-16 cm3 molecule-1 s-1, were measured using the relative rate technique for the reactions of the hydroxyl radical (OH) and ozone (O3) with 3,7-dimethyl-6-octen-1-al ((R)-(+)-citronellal) at (2973) K and 1 atm total pressure. To more clearly define part of citronellal's indoor environment degradation mechanism, the products of the citronellal+OH and citronellal+O3 reactions were also investigated. The positively identified citronellal/OH and citronellal/O3 reaction products were: 3-methylhexanedial HC(O)CH2CH2CH(CH3)CH2C(O)H and 2-oxopropanal (methylglyoxal, CH3C(O)C(O)H). The use of derivatizing agent O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine (PFBHA) was used to propose 3-methylhexanedial as a major citronellal/OH and citronellal/O3 reaction product. The elucidation of this reaction product was facilitated by mass spectrometry of the derivatized reaction products coupled with plausible citronellal/OH and citronellal/O3 reaction mechanisms based on previously published volatile organic compound/OH and volatile organic compound/O3 gas-phase reaction mechanisms.
Keywords
Analytical-processes; Environmental-exposure; Environmental-factors; Environmental-pollution; Exposure-methods; Exposure-levels; Chemical-analysis; Chemical-composition; Chemical-indicators; Chemical-properties; Chemical-reactions; Inhalation-studies; Gas-mixtures; Gas-detectors; Gas-meters
Contact
JR Wells, Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road Morgantown, WV 26505
CODEN
AENVEQ
CAS No.
10028-15-6
Publication Date
20070701
Document Type
Journal Article
Email Address
ozw0@cdc.gov
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Issue of Publication
21
ISSN
1352-2310
NIOSH Division
HELD
Source Name
Atmospheric Environment
State
WV
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