Surface Chemistry Reactions of A-Terpineol [(R)-2-(4-Methyl-3-Cyclohexenyl)isopropanol] with Ozone and Air on a Glass and a Vinyl Tile

Details

• Personal Author:
  Ham JE ; Wells JR
• Description:
  The surface-phase reaction products of a-terpineol [(R)-2-(4-methyl-3- cyclohexenyl)isopropanol] with ozone (O3), air or nitrogen (N2) on both a glass and vinyl flooring tile were investigated using the recently published FLEC Automation and Control System (FACS). The FACS was used to deliver O3 (100 ppb), air or N2 to the surface at a specified flow rate (300 ml/min) and relative humidity (50%) after application of a 1.6% a-terpineol solution in methanol. Oxidation products were detected using the derivatization agents: O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine and N,O-bis(trimethysilyl)trifluoroacetamide. The positively identified reaction products were glyoxal, methylglyoxal and 4-oxopentanal. The proposed oxidation products based on previously published VOC/O3 reaction mechanisms were: 4-methylcyclohex-3- en-1-one, 6-hydroxyhept-en-2-one, 3-(1-hydroxy-1-methylethyl)-6-methylcyclohex- 2-en-1-one) and one surface-enhanced reaction product: 5-(1-hydroxy-1- methylethyl)-2-methylcyclohex-2-en-1-one. Though similar products were observed in gas-phase a-terpineol/O3 reactions, the ratio of the reaction products were different suggesting stabilization of larger molecular weight species by the surface. Emission profiles of these oxidation products over 72 h are also reported. Volatile organic compounds (VOCs) can interact with indoor initiators [such as hydroxyl radicals (OH.), ozone and nitrate radicals (NO3.)] to form a number of oxygenated by-products in the gas-phase. However, when VOCs are applied to or are present on the surface, heterogeneous chemistry with indoor initiators can also occur. The surface can influence the reaction mechanism to produce new surface reaction products. The work, described here, shows the interaction of a-terpineol (major component of pine oil) with ozone and air on both glass and vinyl flooring. These results demonstrated emissions of oxygenated organic compounds as a result of reaction and that further investigations of this chemistry are required to accurately estimate indoor occupant exposures. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Air Pollution Air Pollution, Indoor Chemistry Environmental Health Environmental Monitoring Occupational Health Safety Vinyl Chloride
• Keywords:
  Air-quality Chemical-binding Chemical-composition Chemical-deposition Chemical-properties Chemical-reactions Chemical-synthesis Exposure-assessment Exposure-levels Exposure-methods Gases Indoor-air-pollution Indoor-environmental-quality Organic-chemicals Organic-compounds Organic-vapors Quantitative-analysis Sampling-methods Vinyl-esters Vinyl-plastics

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• ISSN:
  0905-6947
• 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
• Pages in Document:
  394-407
• Volume:
  18
• Issue:
  5
• NIOSHTIC Number:
  nn:20034617
• Citation:
  Indoor Air 2008 Oct; 18(5):394-407
• Contact Point Address:
  Jason E. Ham, Exposure Assessment Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, 1095 Willowdale Road, Morgantown, WV 26505
• Email:
  bvo2@cdc.gov
• CAS Registry Number:
  Glyoxal (CAS RN 107-22-2) ; Methanol (CAS RN 67-56-1) ; Methylglyoxal (CAS RN 78-98-8) ; Ozone (CAS RN 10028-15-6)
• Federal Fiscal Year:
  2009
• NORA Priority Area:
  Services
• Peer Reviewed:
  True
• Source Full Name:
  Indoor Air
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:b65a00640b3408b8d3005f14b223f2593c7e01a83cd0d0767edb6b85da87cbc016b44d2e097192669efa11a7d7f11ad8860c5bbd1f43d9a31f3e84cac548dec1
• Download URL:
  https://stacks.cdc.gov/view/cdc/186760/cdc_186760_DS1.pdf
• File Type:
  [PDF - 430.41 KB ]