What is Hexavalent Chromium - Clark Testing

Hexavalent Chromium



What is Hexavalent Chromium


Hexavalent chromium, noted as Cr(VI) or Cr+6, is a toxic form of the element chromium. Hexavalent chromium compounds are used for their corrosion-resistance, durability, and hardness properties.  

Rarely found in nature, this form is generally man-made. Hexavalent chromium may be present in pigments, electroplating, wood preservatives/fungicides, and chemical synthesis. Additionally, hexavalent chromium is present in fumes generated during the production and welding of chrome alloys.

OSHA mandated a Hexavalent Chromium Standard for exposures in general industry, shipyards and construction.

The following limits were established for hexavalent chromium exposure:
  • Action Level (AL) of 2.5 µg/m3 calculated as an 8-hour time-weighted average
  • Permissible Exposure Limit (PEL) of 5 µg/m3 calculated as an 8-hour time-weighted average
For more information regarding the OSHA standard for Hexavalent Chromium, please visit: https://www.osha.gov/SLTC/hexavalentchromium/standards.html

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