Field Method for the Determination of Hexavalent Chromium by Ultrasonication and Strong Anion-Exchange Solid-Phase Extraction

Details

• Personal Author:
  Ashley, Kevin E. ; Carlton G ; England EC ; Marlow D ; Wang J
• Description:
  A simple, fast, sensitive, and economical field method was developed and evaluated for the determination of hexavalent chromium (CrVI) in environmental and workplace air samples. By means of ultrasonic extraction in combination with a strong anion-exchange solid-phase extraction (SAE-SPE) technique, the filtration, isolation, and determination of CrVI in the presence of trivalent chromium (CrIII) and potential interferents was achieved. The method entails (1) ultrasonication in basic ammonium buffer solution to extract CrVI from environmental matrixes; (2) SAE-SPE to separate CrVI from CrIII and interferences; (3) elution/acidification of the eluate; (4) complexation of chromium with 1,5-diphenylcarbazide; and (5) spectrophotometric determination of the colored chromiumdiphenylcarbazone complex. Several critical parameters were optimized in order to effect the extraction of both soluble (K2CrO4) and insoluble (PbCrO4) forms of CrVI without inducing CrIII oxidation or CrVI reduction. The method allowed for the dissolution and purification of CrVI from environmental and workplace air sample matrixes for up to 24 samples simultaneously in less than 90 min (including ultrasonication). The results demonstrated that the method was simple, fast, quantitative, and sufficiently sensitive for the determination of occupational exposures of CrVI. The method is applicable for on-site monitoring of CrVI in environmental and industrial hygiene samples. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Air Pollution Air Pollution, Indoor Chemistry Chemistry, Analytic Chromium Environmental Monitoring Occupational Health Safety Workplace
• Keywords:
  Air-contamination Air-monitoring Air-quality Air-samples Air-sampling Analytical-chemistry Analytical-methods Analytical-models Analytical-processes Chemical-analysis Chromium-compounds Statistical-analysis Ultrasonic-testing Ultrasonics Workplace-studies

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• ISSN:
  0003-2700
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; OSHA Region 6 ; Texas ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  71
• Issue:
  5
• NIOSHTIC Number:
  nn:20027809
• Citation:
  Anal Chem 1999 Mar; 71(5):1027-1032
• CAS Registry Number:
  Chromium(6+) (CAS RN 18540-29-9)
• Federal Fiscal Year:
  1999
• Peer Reviewed:
  True
• Source Full Name:
  Analytical Chemistry
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:43e827e3a74fcabae4885d1558826f4a6af1c10a3c700247de23baa3170e35c6b23f1be48d4d07a3362f851b2e9d48492c0d4916dad5f2d0343c44e666e6582d
• Download URL:
  https://stacks.cdc.gov/view/cdc/197668/cdc_197668_DS1.pdf
• File Type:
  [PDF - 57.13 KB ]