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SEMI-CONTINUOUS DETERMINATION OF WATER-SOLUBLE PARTICULATE COMPONENTS AND THEIR GASEOUS PRECURSORS: LABORATORY AND FIELD EVALUATION OF INSTRUMENTATION BASED ON WET WALL DENUDER AND ION CHROMATOGRAPHY TECHNOLOGY
Citation:
LONG, R. W., M. S. LANDIS, K. KRONMILLER, B. D. GROVER, D. J. EATOUGH, R. K. STEVENS, AND R. AL-HORR. SEMI-CONTINUOUS DETERMINATION OF WATER-SOLUBLE PARTICULATE COMPONENTS AND THEIR GASEOUS PRECURSORS: LABORATORY AND FIELD EVALUATION OF INSTRUMENTATION BASED ON WET WALL DENUDER AND ION CHROMATOGRAPHY TECHNOLOGY. Presented at AWMA Symposium, Durham, NC, May 09 - 11, 2006.
Impact/Purpose:
1. Provide the Agency with semi-continuous and real-time instrumentation for its monitoring of ozone, ozone precursors, and reaction products of ozone formation.
2. Provide the Agency with semi-continuous and real-time instrumentation for its monitoring of water-soluble PM components and water-soluble atmospheric gases.
Description:
Research conducted by EPA at its facility in Research Triangle Park, NC and by EPA, Brigham Young University (BYU), and others during field intensive studies in California, Utah and Florida has demonstrated the capability for the semi-continuous determination of water-soluble particulate components (SO42-, NO3-, NO2-, Cl-, and NH4+) and gaseous precursors (SO2, HNO3, HONO, HCl, and NH3) using instrumentation based on wet wall denuder (WWD) and ion chromatography (IC) technology. Two instruments, an IC-based prototype monitor developed at Texas Tech University (TTU) and a Dionex Gas-Particle Ion Chromatograph (GPIC), were evaluated in the laboratory using simulated ambient aerosols and gases to compare their response to other measurement methods under controlled conditions and to identify potential sampling artifacts that might occur under ambient conditions. The instruments were also evaluated during field intensive studies in Rubidoux, CA (July 2003); Fresno, CA (December 2003); Lindon, UT (February 2005); Tampa, FL (May 2005); and Riverside, CA (July-August 2005) during which results obtained from the WWD-IC based instruments were compared to results obtained from additional semi-continuous and integrated methods for the determination of water-soluble particulate components and/or their gaseous precursors. Results from the laboratory and field evaluations will be presented.