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Comment published on 19 September 2016, see Atmosphere 2016, 7(9), 119.
Open AccessArticle

Programmable Thermal Dissociation of Reactive Gaseous Mercury, a Potential Approach to Chemical Speciation: Results from a Field Study

1
Division of Marine and Atmospheric Chemistry, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA
2
Electric Power Research Institute, 3420 Hillview Avenue, Palo Alto, CA 94304, USA
*
Author to whom correspondence should be addressed.
Current Address: Atmospheric Chemistry Department, Max Planck Institute for Chemistry, Hahn-Meitner-Weg 1, D-55128 Mainz, Germany.
Current Address: Department of Chemistry, Lawrence University, Appleton, WI 54911, USA.
Based on “Tatum Ernest, C.; Donohoue, D.; Bauer, D.; Ter Schure, A.; Hynes, A.J. Programmable thermal dissociation of reactive gaseous mercury—A potential approach to chemical speciation: Results from a field study. Atmos. Chem. Phys. Discuss. 2012, 12, 33291–33322”.
Atmosphere 2014, 5(3), 575-596; https://doi.org/10.3390/atmos5030575
Received: 9 May 2014 / Revised: 17 July 2014 / Accepted: 22 July 2014 / Published: 13 August 2014
(This article belongs to the Special Issue Atmospheric Mercury)
Programmable Thermal Dissociation (PTD) has been used to investigate the chemical speciation of Reactive Gaseous Mercury (RGM, Hg2+). RGM was collected on denuders and analyzed using PTD. The technique was tested in a field campaign at a coal-fired power plant in Pensacola, Florida. Stack gas samples were collected from ducts located after the electrostatic precipitator and prior to entering the stack. An airship was used to sample from the stack plume, downwind of the stack exit. The PTD profiles from these samples were compared with PTD profiles of HgCl2. Comparison of stack and in-plume samples suggest that the chemical speciation are the same and that it is possible to track a specific chemical form of RGM from the stack and follow its evolution in the stack plume. Comparison of the measured plume RGM with the amount calculated from in-stack measurements and the measured plume dilution suggest that the stack and plume RGM concentrations are consistent with dilution. The PTD profiles of the stack and plume samples are consistent with HgCl2 being the chemical form of the sampled RGM. Comparison with literature PTD profiles of reference mercury compounds suggests no other likely candidates for the speciation of RGM. View Full-Text
Keywords: programmable thermal dissociation; mercury; gaseous elemental mercury; reactive gaseous mercury programmable thermal dissociation; mercury; gaseous elemental mercury; reactive gaseous mercury
MDPI and ACS Style

Ernest, C.T.; Donohoue, D.; Bauer, D.; Schure, A.T.; Hynes, A.J. Programmable Thermal Dissociation of Reactive Gaseous Mercury, a Potential Approach to Chemical Speciation: Results from a Field Study. Atmosphere 2014, 5, 575-596.

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