Method HJ639-2012 was implemented March 1st, 2013. The method recommends an analytical trap composed of 1/3 Tenax 1/3 silica gel 1/3 active carbon or a “C” trap. As the method requires a two minute desorb time, the silica gel in the C trap can be problematic. This application will compare the C trap with the Vocarb 3000 trap for their efficacy when following the HJ-639 method.