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i

Β-Ionone Reactions with Ozone and OH Radical: Rate Constants and Gas-Phase Products

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  • Personal Author:
  • Description:
    The bimolecular rate constants, kOH+beta-ionone (118+/-30)×10-12 cm3 molecule-1 s-1 and kO3+beta-ionone, (0.19+/-0.05)×10-16 cm3 molecule-1 s-1, were measured using the relative rate technique for the reaction of the hydroxyl radical (OH) and ozone (O3) with 4-(2,6,6-trimethyl-1-cyclohexen-1-yl)-3-buten-2-one (beta-ionone) at 297+/-3 K and 1 atm total pressure. To more clearly define part of beta-ionone's indoor environment degradation mechanism, the products of the beta-ionone+OH and beta-ionone+O3 reactions were also investigated. The identified beta-ionone+OH reaction products were: glyoxal (ethanedial, HC(=O)C(=O)H), and methylglyoxal (2-oxopropanal, CH3C(=O)C(=O)H) and the identified beta-ionone+O3 reaction product was 2-oxopropanal. The derivatizing agents O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine (PFBHA) and N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) were used to propose 2,6,6-trimethylcyclohex-1-ene-1-carbaldehyde as the other major beta-ionone+OH and beta-ionone+O3 reaction product. The elucidation of this other reaction product was facilitated by mass spectrometry of the derivatized reaction products coupled with plausible beta-ionone+OH and beta-ionone+O3 reaction mechanisms based on previously published volatile organic compound+OH and volatile organic compound+O3 gas-phase reaction mechanisms. The additional gas-phase products observed from the beta-ionone+OH reaction are proposed to be the result of cyclization through a radical intermediate. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    1352-2310
  • Document Type:
    Text
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    HELD - Health Effects Laboratory Division
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Volume:
    41
  • Issue:
    38
  • NIOSHTIC Number:
    nn:20032959
  • Citation:
    Atmos Environ 2007 Dec; 41(38):8758-8771
  • Contact Point Address:
    J. Raymond Wells, Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505
  • Email:
    ozw0@cdc.gov
  • CAS Registry Number:
    Ozone (CAS RN 10028-15-6)
  • Federal Fiscal Year:
    2008
  • NORA Priority Area:
    Services
  • Peer Reviewed:
    True
  • Source Full Name:
    Atmospheric Environment
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:21d275b1e8b7484069928736e9ed1a9391e7fd0766436e25281ebf8462e1cff863eea6421524bfcd34b5d00d3351666e04d351fff7bbbcc7867d758ac458e8a9
  • Download URL:
  • File Type:
    Filetype[PDF - 286.91 KB ]
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