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LABORATORY AND FIELD EVALUATIONS OF METHODOLOGY FOR DETERMINING HEXAVALENT CHROMIUM EMISSIONS FROM STATIONARY SOURCES
Citation:
Carver, A. LABORATORY AND FIELD EVALUATIONS OF METHODOLOGY FOR DETERMINING HEXAVALENT CHROMIUM EMISSIONS FROM STATIONARY SOURCES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-91/052 (NTIS PB92101336), 1991.
Description:
Development of methodology for sampling and analysis of chromium to support stationary source regulations was initiated in 1984. his study was initiated to determine whether chromium emissions should be regulated under Section 112 of the Clean Air Act National Emissions Standards for Hazardous Air Pollutants (NESHAP). o support stationary source regulations, it is important that (1) the sampling procedure not change the chromium valence state during sampling and (2) an analytical technique for measuring low concentration levels of chromium be available. hese goals are achieved with the current EPA "Draft Method for Sampling and Analysis of Hexavalent Chromium at Stationary Sources." he draft method utilizes a recirculating system to flush impinger reagent into the sampling nozzle during sample collection. mmediate contact of the stack gas with impinger reagent "fixes" the chromium valence state. on chromatography coupled with post column derivatization and an ultraviolet visible detector is used to analyze Cr(VI) in the parts per trillion range. ield tests were conducted at metal plating facilities, industrial cooling towers. municipal waste incinerators, sewage sludge incinerators, and hazardous waste incinerators. t was at the hazardous waste facility that the new method was proven to have acceptable precision and essentially no conversion in the sample train. tandard deviations for the sampling runs were determined.
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LABORATORY AND FIELD EVALUATIONS OF METHODOLOGY FOR DETERMINING HEXAVALENT CHROMIUM EMISSIONS FROM STATIONARY SOURCES