Student Research Projects
The Development of a Denuder Manifold Methodology for the Measurement of Reactive Gaseous Mercury
Dr. Elizabeth Malcolm|
|Department||Earth and Environmental Sciences|
RGM (reactive gaseous mercury) has steadily increased in the atmosphere as a result of coal fired power plants and waste incinerators. It exists in the forms of HgCl2, HgO, HgBr2, and Hg (OH) 2. It has a short lifespan in the atmosphere due to its high depositional rate. In addition it is readily scavenged by precipitation. RGM’s unique physical and chemical properties make it a concern to human health therefore a methodology for its measurements in the atmosphere are pressing. The KCl coated quartz annular denuder methodology with a manifold was tested in this study. It was found with use of the manifold uniform amounts of HgCl2 could be delivered unto four quartz annular denuders. Upon thermal desorbing the denuders HgCl2 decomposed into Hg0 which then was quantified with a Tekran 2500 CFVAS. The denuders had 7.51 ± .56 ug/m3 HgCl2 adhere to them. With the defining of optimal procedures for testing RGM with quartz annular denuders and manifold an understanding of the cycling in the atmosphere can be more easily obtained.