Validation and optimization of a solid sorbent dynamic personal air sampling method for aldehydes

Details

• Personal Author:
  Que Hee-S ; Shen-Y
• Description:
  A solid sorbent personal dynamic air sampling method for aldehydes using chemisorption through reaction with O-(2,3,4,5,6-pentafluorobenzyl) hydroxylamine hydrochloride (PFBHA) has been developed and several aldehydes validated. The aim of this study was to validate this method for formaldehyde, to test the influence of temperature on sampling efficiency, and also to optimize desorption efficiency. Formaldehyde is an animal carcinogen and a suspected human carcinogen. There is need for a sensitive sampling method. Vapors of known concentrations were generated in Tedlar gas bags by syringe injection of known volumes of formalin of measured formaldehyde content. Chemisorption through reaction with 20% (w /w) PFBHA on Tenax TA solid sorbent (200 mg) in a Pyrex tube (7-cm long, 7-mm OD, and 5-mm ID) occurred during collection with a personal sampling pump operated at 10 or 50 mL/ min. The oxime derivative was desorbed quantitatively (>75%) with hexane and an aliquot injected for gas chromatographic analys is on a nonpolar capillary column with 63(Ni) electron capture detection. Formaldehyde at 8 ppm-hours relative to the TLV-TWA concentration can be successfully sampled with a recovery of 94 +/- 4%. Valeraldehyde and acrolein at their TLV-TWAs H 8 hours showed no significant differences (P<0.05) between the recoveries at different relative humidities (1 and 90%) and sampling temperatures (1, 25, and 401C). The critical time for desorption was 30 minutes with occasional shaking or 2 minutes for vigorous manual shaking. The desorption efficiency for valeraldehyde is 88 +/- 2%, and the desorption efficiency for acrolein is 100 +/- 3%. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Carcinogens Environmental Monitoring Laboratories Occupational Health Particulate Matter Safety Volatilization
• Keywords:
  Air-monitoring Air-quality-measurement Air-sampling Air-sampling-equipment Air-sampling-techniques Airborne-particles Exposure-assessment Laboratory-testing Mathematical-models Quantitative-analysis Sampling-methods Standards Vapor-detectors

  More +
• Publisher:
  American Industrial Hygiene Association
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Abstract or Summary
• 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:
  45
• NIOSHTIC Number:
  nn:20039221
• Citation:
  American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia. Fairfax, VA: American Industrial Hygiene Association, 1998 May; :45
• Federal Fiscal Year:
  1998
• NORA Priority Area:
  Research Tools and Approaches: Exposure Assessment Methods
• Performing Organization:
  University of California Los Angeles, Los Angeles, CA
• Peer Reviewed:
  False
• Start Date:
  19950901
• Source Full Name:
  American Industrial Hygiene Conference and Exposition, May 9-15, 1998, Atlanta, Georgia
• End Date:
  19990831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:cf6e2896612dbac5a765f14327e37215ce5fe3065c77fe738422aa72df0e4086d93d58fd4dd634f66b06b49c3f8de6c4c46632c6e1780e3b723b685f59ba03fc
• Download URL:
  https://stacks.cdc.gov/view/cdc/192644/cdc_192644_DS1.pdf
• File Type:
  [PDF - 766.06 KB ]