Rate constants for the gas-phase reactions of ozone and nitrate radicals with the sesquiterpenes: valencene and farnesol

Details

• Personal Author:
  Ham JE
• Description:
  Sesquiterpenes are constituents of a variety of essential oils that are used in flavorings, perfumes, personal care, and cleaning products. Two sesquiterpenes that are commonly used as indoor fragrances are valencene and farnesol. Knowing the reaction rate constants of these chemicals with ozone (O3) and nitrate radical (NO3&bull) is an important factor in determining their fate indoors. In this study, the bimolecular rate constants of kO3+valencene (0.35+/-0.9) × 10 -16, kO3+farnesol (21+/-5.2) × 10 -16, kNO3&bull+valencene (7.9+/-2.0) × 10 -12, and kNO3&bull+farnesol (44+/-11) × 10-12 cm3 molecule-1 s-1 were measured using the relative rate technique at 297 +/- 3 K and 1 atm total pressure. Using the rate constants reported here and measured/modeled indoor concentrations of O3 and NO3&bull (20 ppb and 1 ppt, respectively), pseudo-first-order-rate lifetimes k'O3+valencene (0.06), k'O3+farnesol (3.8), k'NO3+valencene (0.7), and k'NO3·+farnesol (3.9)h-1 were determined. [Description provided by NIOSH]
• Subjects:
  Aerosols Chemistry Environmental Health Food Additives Occupational Health Safety
• Keywords:
  Aerosol-dispensers Chemical-composition Chemical-properties Chemical-reactions Cleaning-compounds Food-additives Indoor-environmental-quality Models Molecular-structure Odorizers Oils

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• ISSN:
  0538-8066
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  45
• Issue:
  8
• NIOSHTIC Number:
  nn:20042893
• Citation:
  Int J Chem Kinet 2013 Aug; 45(8):508-514
• Contact Point Address:
  Jason Ham, Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV 26505
• Email:
  bvo2@cdc.gov
• Federal Fiscal Year:
  2013
• NORA Priority Area:
  Healthcare and Social Assistance ; Services
• Peer Reviewed:
  True
• Source Full Name:
  International Journal of Chemical Kinetics
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:8e66be8689ce662ebff25c5990ec077bc763da01a23cd17e716e5cba9650afbcc25d94d90b6c54472fc11cd049141735c9466e1f82e72e5c56c0ba834a45d2fa
• Download URL:
  https://stacks.cdc.gov/view/cdc/194965/cdc_194965_DS1.pdf
• File Type:
  [PDF - 445.83 KB ]