Are your samples being properly prepared to avoid high bias due to interferences? EPA Method 1632A is the only EPA Method published for arsenic speciation in tissue samples, and it is usually the first choice for many regulatory-driven and government-funded projects. EPA Method 1632A describes two different digestion techniques that may be used for determination of dimethylarsinic acid (DMAs), and recent research conducted by Brooks Rand Labs has demonstrated that data produced by one of the digestion methods can be biased high for DMAs if the samples being analyzed contain significant amount of arsenobetaine (AsB), the most common form of arsenic found in most fin fish.

Come see Annie Carter, BRL’s VP of Operations, present on this topic (view the abstract) at the National Environmental Monitoring Conference (NEMC) in Washington D.C. on August 7th.