Citronellal reactions with ozone and OH radical: rate constants and gas-phase products detected using PFBHA derivatization.
Harrison-JC; Ham-JE; Wells-JR
Atmos Environ 2007 Jul; 41(21):4482-4491
The bimolecular rate constants, kOH+citronellal, (150+/-40)×10-12 cm3 molecule-1 s-1 and, kO3+citronellal, (3.5+/-1.2)×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 (297+/-3) 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.
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
JR Wells, Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road Morgantown, WV 26505