Simple Extraction of Sulfite and Sulfate in Cogeneration Plant Circulating Fluidized Bed Fly Ash for Ion Chromatographic Analysis

    Volume 2, Issue 3 (March 2005)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 28 February 2005

    Page Count: 8


    Cowen, WF
    Lead Research Chemist, Chemicals Environmental Technology Center, Air Products and Chemicals, Inc., Allentown, 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.


    Paper ID: JAI13055

    DOI: 10.1520/JAI13055

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    Author
    Title Simple Extraction of Sulfite and Sulfate in Cogeneration Plant Circulating Fluidized Bed Fly Ash for Ion Chromatographic Analysis
    Symposium , 0000-00-00
    Committee E19