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Inorganic : Atomic Absorption - arsenic
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From: MSN Nickname·Steve·  in response to Message 1Sent: 4/8/2008 9:38 PM
I'm a chemist (teacher) but I'm not immediately familiar with the procedure.  That is right, the hydrazine reduces the arsenic to arsenic(III).  This procedure, http://www.epa.gov/testmethods/pdfs/7061a.pdf, uses SnCl2 as the reducing agent.

You might try posting in the Chemical Forums at http://www.chemicalforums.com/.  They have an analytical forum there that is pretty active.  Sci.chem (Google) and The Chemistry Cluster (Yahoo) also have members with more practical experience than I do.
 
Good luck!

Steve