Testing for arsenic exposure commonly involves assaying for a whole range of arsenic-containing ions, including arsenite (As(III)), arsenate (As(V)), monomethylarsonic acid (MMA), dimethylarsinic acid (DMA), trimethylarsine oxide (TMAO), arsenobetaine (AB), and arsenocholine (AC).

A certified reference material (CRM) has now been reported that contains a panel of arsenic species in urine. The CRM can be used to validate analytical instrumentation and assays and to provide quality assurance of assessment measurements in a variety of situations including environmental, health and forensics.

• A human urine standard reference material for accurate assessment of arsenic exposure
  L. L. Yu, C. P. Verdon, W. C. Davis, G. C. Turk, K. L. Caldwell, R. L. Jones, B. Buckley, R. Xie,
  Analyt. Method. 2011.
  DOI: 10.1039/C0AY00611D