In August 2013 the National Atmospheric Deposition Program (NADP) Atmospheric Mercury Network (AMNet) teamed with the Wisconsin Department of Natural Resources to initiate a study to compare the new Tekran 2537X to the 2537B.  The 2537B is the system in use within AMNet at the WI07 site.  The 2537X was loaned from Tekran to NADP while the 1130 and 1135 components were donated by the Florida Department of Environmental Protection (FDEP).  Several aspects of the speciation system were evaluated including precision and accuracy estimates, differences in glassware collection efficiency, evaluation of glassware cleaning protocols, to name a few.  In August 2014 a third speciation system was added to the study.  The 2537B was donated by FDEP with the 1130 and 1135 coming from the New York State Department of Environmental Conservation. 

Results from the 2 system study show the 2537X and 2537B have Gaseous Elemental Mercury (GEM) differences of 1.3% or 0.02 ng/m3 producing over 85% of combined valid data.  Gaseous Oxidized Mercury (GOM) and Particulate Bound Mercury (PBM) differences are higher and quite variable although few results above the expected Method Detection Limit have been seen.  The results from the GEM precision and accuracy studies will be presented along with preliminary results from the three instrument study and suggested modifications to glassware cleaning procedures.