A New Passive Sampler for Aldehydes

Details

• Personal Author:
  Que Hee SS ; Tsai SW
• Description:
  A new solid sorbent passive air sampler used a coated Tenax TA pellet that chemisorbed aldehydes by reaction with 10% (w/w) O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine hydrochloride. The aldehyde permeated a silicone membrane to gain access to the sampling element at the end of a cylinder of diffusion path length 1.1 cm and diameter 1.3 cm. Vapors of known concentrations around the threshold limit values/time-weighted averages of n-valeraldehyde and acrolein and specific relative humidities (RH) were generated by syringe pumps in a dynamic generation and dilution system. An exposure chamber allowed measurement of face velocities, temperatures, exposing vapor concentrations, and RH. The O-oxime derivative was desorbed quantitatively with hexane, and an aliquot injected for gas chromatographic analysis on a low polarity capillary column using mass spectrometric or electron capture detection. The critical face velocity of the sampler was 15-20 ft/min and the capacity was about 30 µmoles. RH (3 -1% to 79 -2%) and temperature (4 -1 degrees C to 48 -2 degrees C) had no effects on the sampling constants of either aldehyde. Intermittent exposures had the same aldehyde equivalent recoveries as constant concentration exposures at the same time-weighted average. Stability after sampling was at least 6 months and the shelf life was over 3 months. The experimental sampling constants were 4.43 -0.19 cm3/min for valeraldehyde and 7.73 -0.57 cm3/min for acrolein. [Description provided by NIOSH]
• Subjects:
  Aldehydes Environmental Monitoring Formaldehyde Hexanes Mass Spectrometry Occupational Health Safety Workplace
• Keywords:
  Air-sampling Air-sampling-techniques Exposure-limits Gas-chromatography Mass-spectrometry Sampling-methods Workplace-monitoring
• ISSN:
  0002-8894
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  California ; OSHA Region 9
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  463-473
• Volume:
  60
• Issue:
  4
• NIOSHTIC Number:
  nn:20024503
• Citation:
  Am Ind Hyg Assoc J 1999 Jul/Aug; 60(4):463-473
• Contact Point Address:
  Department of Environmental Health Sciences and UCLA Center for Occupational and Environmental Health, UCLA School of Public Health, 10833 Le Conte Avenue, Los Angeles, CA 90095-1772
• CAS Registry Number:
  Acrolein (CAS RN 107-02-8) ; Hexane (CAS RN 110-54-3) ; Hydroxyamine hydrochloride (CAS RN 5470-11-1)
• Federal Fiscal Year:
  1999
• Performing Organization:
  University of California Los Angeles, Los Angeles, CA
• Peer Reviewed:
  True
• Start Date:
  19950901
• Source Full Name:
  American Industrial Hygiene Association Journal
• End Date:
  19990831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:fdded14b9b55dbd4b280c5d2ba0edfbc824e152c7dafe5a9d29f995fc9cdd2c996067b7174188ef94aec179ae0d80ce8dacbb124bdfdcef5b6061367fcbac094
• Download URL:
  https://stacks.cdc.gov/view/cdc/196276/cdc_196276_DS1.pdf
• File Type:
  [PDF - 380.56 KB ]