Cryogenic trapping of oxidized mercury species from combustion flue gas

To further understand the speciation and partitioning of mercury species in combustion systems, it is necessary to be able to identify and quantitate the various forms of oxidized mercury. Currently accepted methods for speci ating mercury (Ontario Hydro Method, EPA Method 29, MESA Method) only separ ate elemental and oxidized forms of mercury at best, and they are expensive . This paper describes research on the application of cryogenics to the sam pling and separation of oxidized forms of mercury from combustion flue gas. This research has resulted in the development and demonstration of a proto type cryogenic sampling device for the determination of oxidized mercury in flue gas. Preliminary results are encouraging, as they show that mercuric chloride and mercuric oxide can be effectively separated through the protot ype device. Further development, refinement, and application of this device are expected to generate data that are critically needed to develop effect ive control technologies for mercury. (C) 2000 Published by Elsevier Scienc e B.V. All rights reserved.