Brooks Applied Labs services

The experience of Brooks Applied Labs comes into play when arsenic speciation in difficult matrices is to be determined. We have developed a variety of different arsenic testing methods that utilize different chromatographic separation modes. These methods allow us to provide the lowest detection limits to our clients for their toughest samples. For instance, arsenic speciation in a 10,000 ppm Fe, Ca, Al and high sulfate matrix or highly saline samples (up to 3%) can be determined with ppt detection limits.

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.