Reaction rates of ozone and terpenes adsorbed to model indoor surfaces

Details

• Personal Author:
  Morrison GC ; Springs M ; Wells JR
• Description:
  Reaction rates and reaction probabilities have been quantified on model indoor surfaces for the reaction of ozone with two monoterpenes (Delta3-carene and d-limonene). Molar surface loadings were obtained by performing breakthrough experiments in a plug-flow reactor (PFR) packed with beads of glass, polyvinylchloride or zirconium silicate. Reaction rates and probabilities were determined by equilibrating the PFR with both the terpene and the ozone and measuring the ozone consumption rate. To mimic typical indoor conditions, temperatures of 20, 25, and 30 degrees C were used in both types of experiments along with a relative humidity ranging from 10% to 80%. The molar surface loading decreased with increased relative humidity, especially on glass, suggesting that water competed with the terpenes for adsorption sites. The ozone reactivity experiments indicate that higher surface loadings correspond with higher ozone uptake. The reaction probability for Delta3-carene with ozone ranged from 2.9 x 10(-6) to 3.0 x 10(-5) while reaction probabilities for d-limonene ranged from 2.8 x 10(-5) to 3.0 x 10(-4). These surface reaction probabilities are roughly 10 - 100 times greater than the corresponding gas-phase values. Extrapolation of these results to typical indoor conditions suggests that surface conversion rates may be substantial relative to gas-phase rates, especially for lower volatility terpenoids. [Description provided by NIOSH]
• Subjects:
  Air Movements Air Pollution, Indoor Environmental Health Environmental Monitoring Humidity Laboratories Occupational Health Ozone Safety Temperature
• Keywords:
  Adsorbents Air-flow Air-monitoring Author Keywords: Ozone Exposure-assessment Gas-adsorption Indoor-air-pollution Indoor-environmental-quality Laboratory-testing Laboratory Study Models Reaction-rates Reaction Probability Relative-humidity Simulation-methods Surface-properties Surface Reaction Temperature-control Terpene Terpene-compounds

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• ISSN:
  0905-6947
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Missouri ; OSHA Region 3 ; OSHA Region 7 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  319-327
• Volume:
  21
• Issue:
  4
• NIOSHTIC Number:
  nn:20038694
• Citation:
  Indoor Air 2011 Aug; 21(4):319-327
• Contact Point Address:
  G. C. Morrison, Missouri University of Science & Technology, 1870 Miner Circle, Rolla, MO 65409, USA
• Email:
  gcm@mst.edu
• CAS Registry Number:
  (+)-Limonene (CAS RN 5989-27-5) ; 3-Carene (CAS RN 13466-78-9) ; Ozone (CAS RN 10028-15-6)
• Federal Fiscal Year:
  2011
• NORA Priority Area:
  Healthcare and Social Assistance ; Services
• Peer Reviewed:
  True
• Source Full Name:
  Indoor Air
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7230d4ba36725e152b1e7f3e8122f29ead727c78634545f4c8fc763486a0976cad6ed8536f5dd61760489f6c23138fc4d4d83f199930ab4b3977094722d631e4
• Download URL:
  https://stacks.cdc.gov/view/cdc/192318/cdc_192318_DS1.pdf
• File Type:
  [PDF - 235.49 KB ]