Method for the Determination of Hexavalent Chromium Using Ultrasonication and Strong Anion Exchange Solid Phase Extraction

Details

• Personal Author:
  Ashley, Kevin E. ; Wang J
• Description:
  A method for the determination of hexavalent chromium (Cr.sup.VI) in environmental and industrial hygiene samples is provided. Based on the chemical properties of chromium species in aqueous solutions, a simple, fast, sensitive, and economical field method has been developed and evaluated for the determination of hexavalent chromium (Cr.sup.VI). Using ultrasonic extraction in combination with a strong anion exchange solid phase extraction (SAE-SPE) technique, the filtration, preconcentration, and isolation of Cr.sup.VI in the presence of other chromium species and interferents was achieved. The method generally involves: (1) ultrasonication in basic buffer solution to extract Cr.sup.VI from environmental matrices; (2) strong anionic exchange solid phase extraction to separate Cr.sup.VI from other chromium species and potential interferents; (3) acidification of the eluate containing the Cr.sup.VI ions; (4) complexation of Cr.sup.VI with a complexing agent to form a soluble, colored Cr.sup.VI -complex; and (5) spectrophotometric determination of the colored Cr.sup.VI -complex. Preferably, the ultrasonication step is carried out in the presence of a slightly basic ammonium buffer and the complexing agent is 1,5-diphenylcarbazide. [Description provided by NIOSH]
• Subjects:
  Chemistry Chemistry, Analytic Chromium Occupational Health Safety
• Keywords:
  Analytical-chemistry Analytical-methods Analytical-processes Chromium-compounds Ultrasonic-testing Ultrasonics
• Document Type:
  Text
• Genre:
  Other
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DART - Division of Applied Research and Technology
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-13
• NIOSHTIC Number:
  nn:20025645
• Citation:
  US Pat 6,808,931 2004 Oct; :1-13
• CAS Registry Number:
  Chromium(6+) (CAS RN 18540-29-9)
• Federal Fiscal Year:
  2005
• Peer Reviewed:
  False
• Source Full Name:
  United States Patent 6,808,931
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:064f2de65aab2656e6e79e6ddbdd0b3898510cea4f62c485fb43fe8f22b5687e111c45e770d7c25a4a7a33a1b1ddeb2b57935d79a1c28606d223af9866e06be5
• Download URL:
  https://stacks.cdc.gov/view/cdc/196924/cdc_196924_DS1.pdf
• File Type:
  [PDF - 1.64 MB ]