Field Method for the Determination of Insoluble or Total Hexavalent Chromium in Workplace Air

Details

• Personal Author:
  Ashley, Kevin E. ; Drake, Pamela L. ; Hazelwood KJ ; Marcy D
• Description:
  National Institute for Occupational Safety and Health method 7703 is a portable field procedure for the analysis of workplace air filter samples for hexavalent chromium (CrVI) content immediately after the samples are collected. The field method prescribes CrVI extraction from air filter samples with an ammonium sulfate/ammonium hydroxide extraction buffer using ultrasonic extraction (UE). Strong anion-exchange solid-phase extraction (SAE-SPE) is then used to separate CrVI from trivalent chromium and other interferences. Portable spectrophotometric measurement of CrVI is then conducted using the 1,5-diphenylcarbazide (DPC) method. However, it has been found that the ammonium extraction buffer does not adequately bring insoluble CrVI compounds into solution during the UE process. Thus, it was deemed necessary to modify the field method so that it would provide acceptable recoveries for insoluble CrVI compounds. To this end, a more alkaline extraction solution - sodium carbonate/sodium bicarbonate buffer - was investigated. The modified procedure using the highly alkaline extraction solution was demonstrated to be compatible with SAE-SPE cartridges when determining insoluble CrVI in air filter samples. It was found that the carbonate/bicarbonate buffer was equally effective for complete dissolution of both insoluble and soluble forms of CrVI. Furthermore, the modified procedure met desired performance criteria established for air sampling and analytical methods. [Description provided by NIOSH]
• Subjects:
  Chromium Environmental Monitoring Occupational Health Safety Workplace
• Keywords:
  Air-sampling Air-sampling-equipment Air-sampling-techniques Analytical-methods Author Keywords: Field Method Chromium-compounds Hexavalent Chromium Insoluble Chromates On-site Analysis Sample-preparation Sample Preparation Sampling-methods Workplace-monitoring Workplace Air

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• Series:
  Mining Publications
• ISSN:
  1545-9624
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Idaho ; Ohio ; OSHA Region 10 ; OSHA Region 5 ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology ; SRL - Spokane Research Laboratory
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  1
• Issue:
  9
• NIOSHTIC Number:
  nn:20025410
• Citation:
  J Occup Environ Hyg 2004 Sep; 1(9):613-619
• Contact Point Address:
  National Institute for Occupational Safety and Health, Spokane Research Laboratory, 315 E. Montgomery Avenue, Spokane, WA 99207
• Email:
  PDrake@cdc.gov
• CAS Registry Number:
  16065-83-1 ; Chromium (CAS RN 7440-47-3) ; Chromium(6+) (CAS RN 18540-29-9)
• Federal Fiscal Year:
  2004
• NORA Priority Area:
  Research Tools and Approaches: Exposure Assessment Methods
• Peer Reviewed:
  True
• Source Full Name:
  Journal of Occupational and Environmental Hygiene
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:50fb0e400beb4b2e416adc78dccb8a0aee8a048793ab7a1a78db76b7ba6535541de8d58571016c0d40aadf9c8efe8534ecfddc85a6d8b2cb42c4b704d57e2658
• Download URL:
  https://stacks.cdc.gov/view/cdc/220933/cdc_220933_DS1.pdf
• File Type:
  [PDF - 282.38 KB ]