Chromium Cr
Chromium (Cr) is a polyvalent element and can exist in several distinct oxidation states, but only trivalent chromium [Cr(III)] and hexavalent chromium [Cr(VI)] occur with any frequency in the natural environment. The mobility, bioavailability, and toxicity of chromium largely depend on which of these two chemical species is prevalent. The speciation of chromium is determined by the processes that control reduction/oxidation reactions in the environment. As can be seen by the adjacent simplified Pourbaix diagram of chromium species in water, species conversion can occur with only fairly minor changes in pH and Eh.

Chromium is a naturally occurring metal found in small quantities associated with other metals, particularly iron. It is commonly used for making steel and other alloys, bricks in furnaces, dyes and pigments, chrome plating, leather tanning, and wood preserving. Due to its extensive use in industrial processes, large quantities of chromium compounds are discharged into the environment.

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Chromium Related News

A Better Way to Measure Cr(VI)

While the standard technique for detecting hexavalent chromium, or Cr(VI), has improved over the years with the addition of ion chromatography (IC) coupled to UV/visible spectrophotometry, the EPA published methods still rely upon reaction-based chemistry which are...

ASTM Symposium – Beyond the Implant

Many of our clients have no idea that BAL supports human diagnostic testing, specifically research related to patients that have undergone arthroplasty surgery (such as hip replacement). On May 9-10, one of our scientists, Russell Gerads, presented two invited...

In Case You Missed It: BAL Presentations February – April

If you follow our newsletters, you probably have noticed that BAL staff have had a busy winter and spring attending and presenting at many conferences around the country and even overseas. In case you missed any of the announcements or would like a copy of the...