Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Role of HC1 in Adsorption of Elemental Mercury Vapor by Calcium-Based Sorbents.
Author Ghorishi, B. ; Gullett, B. K. ; Jozewicz, W. ; Kozlowski, W. ;
CORP Author ARCADIS Geraghty and Miller, Inc., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Air Pollution Prevention and Control Div.
Publisher 1999
Year Published 1999
Report Number EPA-68-C-99-201; EPA/600/A-99/060;
Stock Number PB99-171548
Additional Subjects Air pollution ; Mercury(Metal) ; Sorbents ; Vapors ; Sorption ; Calcium ; Hydrogen chloride ; Gypsum ; Stationary sources ;
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB99-171548 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 05/04/2000
Collation 22p
The paper gives results of a study to identify active sites and surface functional groups that may contribute to the absorption of elemental mercury (Hg) by relatively inexpensive calcium (Ca)-based sorbents. The study investigated the formation of chlorine (C1) sites in CA-based sorbents as well as their role and reactivity in the absorption of Hg. HC1-exposed calcium sulfate dihydrate (gypsum) exhibited a superior Hg sorption capability. Crystalline water molecules on the surface of the gypsum were confirmed to contribute indirectly to Hg uptake. These surface molecules may have absorbed HC1 through hydrogen bond formation between an oxygen atom of a crystalline water molecule and a hydrogen atom of an HC1 molecule, Two adjacent, physically absorbed HC1 molecules could then trap an Hg molecule through formation of a mercuric-chloride-like molecule. Significant correlations between C1 and Hg uptake by gypsum were noted.