Mercury speciation in coal-fired power plant plumes observed at three surface sites in the southeastern U.S.

摘要: Elemental Hg (Hg0), reactive gaseous (RGM) and fine particulate (HgP) were measured intermittently at three sites in the southeastern U.S. from June 2001 through November 2004. Simultaneous measurements of SO2 NOy used to identify plumes coal fired power plants (CFPPs). Emission signatures back trajectories identity specific CFPPs, compare observed (i.e., site) versus expected stack) speciation. Results for 41 precipitation-free plume events show that RGM:SO2 is substantially lower (by a factor 2−4) than RGM:SO2. HgP represented 2%, or less, total-Hg CFPP plumes, general agree- ment with emission estimates. 21 events, where both RGM Hg0 could be estimated, + Hg0) was essentially conserved point site, dominant form (average 84%). estimates, based on analyses EPRI−ICR speciation model, indicat...