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Gas-Phase Chemistry of Alpha-Terpineol with Ozone and OH Radical: Rate Constants and Products

Public Domain


Details

  • Personal Author:
    Wells JR
  • Description:
    A bimolecular rate constant, kOH+alpha-terpineol, of (1.9 +/- 0.5) x 10(-10) cm3 molecule(-1) s(-1) was measured using gas chromatography/mass spectrometry and the relative rate technique for the reaction of the hydroxyl radical (OH) with alpha-terpineol (1-methyl-4-isopropyl-1-cyclohexen-8-ol) at (297 +/- 3) K and 1 atm total pressure. Additionally, a bimolecular rate constant, kO3+alpha-terpineol, of (3.0 +/- 0.2) x 10(-16) cm3 molecule(-1) s(-1) was measured by monitoring the first order decrease in ozone concentration as a function of excess alpha-terpineol. To better understand alpha-terpineol's gas-phase transformation in the indoor environment, the products of the alpha-terpineol + OH and alpha-terpineol + 03 reactions were also investigated. The positively identified alpha-terpineol/OH reaction products were acetone, ethanedial (glyoxal, HC(=O)C(=O)H), and 2-oxopropanal (methyl glyoxal, CH3C(=O)C(=O)H). The positively identified alpha-terpineol/O3 reaction product was 2-oxopropanal (methyl glyoxal, CH3C(=O)C(=O)H). The use of derivatizing agents O-(2,3,4,5,6-pentalfluorobenzyl)hydroxylamine (PFBHA) and N,O-bis(trimethylsilyl)trifluoroacetamide (BSTFA) clearly indicated that several other reaction products were formed. The elucidation of these other reaction products was facilitated by mass spectrometry of the derivatized reaction products coupled with plausible alpha-terpineol/OH and alpha-terpineol/O3 reaction mechanisms based on previously published volatile organic compound/ OH and volatile organic compound/O3 gas-phase reaction mechanisms. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    0013-936X
  • 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:
    39
  • Issue:
    18
  • NIOSHTIC Number:
    nn:20028550
  • Citation:
    Environ Sci Technol 2005 Sep; 39(18):6937-6943
  • Contact Point Address:
    Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, West Virginia 26505, USA
  • Email:
    ozw0@cdc.gov
  • Federal Fiscal Year:
    2005
  • NORA Priority Area:
    Research Tools and Approaches: Exposure Assessment Methods
  • Peer Reviewed:
    True
  • Source Full Name:
    Environmental Science and Technology
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:6500009a4b5d074fe17399a4b8ccd51d5cafb8917ceaa19f80df79c8041e819f965502627af7f7ff3245cad7844c4fcb7346160ecfe778a18b3ca9ee9bbc51f0
  • Download URL:
  • File Type:
    Filetype[PDF - 175.04 KB ]
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