ISSN: 1546-962X
Published Online: 28 February 2005
Page Count: 8

Simple Extraction of Sulfite and Sulfate in Cogeneration Plant Circulating Fluidized Bed Fly Ash for Ion Chromatographic Analysis
Cowen, WF
Lead Research Chemist, Chemicals Environmental Technology Center, Air Products and Chemicals, Inc., PA

(Received 9 September 2004; accepted 19 November 2004)

Abstract

A simple method is described for analyses of sulfite and sulfate, in cogeneration plant fly ash/bottom ash from a coal-fired circulating fluidized bed (CFB) steam-electricity cogeneration process. Ash is shaken for 3 h (room temperature) in 3 mM disodium EDTA solution, and then the filtrate is analyzed by ion chromatography/suppressed conductivity. The EDTA slows the rate of metal ion-catalyzed sulfite oxidation by dissolved oxygen without using formaldehyde preservative. Sulfite standards in EDTA solution were stable for up to 3 days at room temperature in the presence of air. Detection limits were 0.08% by mass SO³²⁻ and 0.1 % by mass SO⁴²⁻ for 0.1 g fly ash extracted with 100 m1 of the EDTA reagent.

Keywords:
cogeneration, CFB ash, fly ash, sulfite, sulfate, ion chromatography

Paper ID: JAI13055
DOI: 10.1520/JAI13055
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