Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Laboratory and Field Evaluations of a Methodology for Determining Hexavalent Chromium Emissions from Stationary Sources.
Author Carver, A. C. ;
CORP Author Entropy Environmentalists, Inc., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher Oct 91
Year Published 1991
Report Number EPA-68-02-4550; EPA/600/3-91/052;
Stock Number PB92-101336
Additional Subjects Chromates ; Flue gases ; Chromatography ; Air pollution ; Stationary sources ; Laboratory tests ; Field tests ; Toxic substances ; Incinerators ; Evaluation ; Valence ; Hexavalent chromium
Library Call Number Additional Info Location Last
NTIS  PB92-101336 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 02/24/1992
Collation 108p
The 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). To 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. These goals are achieved with the current EPA 'Draft Method for Sampling and Analysis of Hexavalent Chromium at Stationary Sources.' The draft method utilizes a recirculating system to flush impinger reagent into the sampling nozzle during sample collection. Immediate contact of the stack gas with impinger reagent 'fixes' the chromium valence state. Ion chromatography coupled with post column derivatization and ultraviolet visible detector is used to analyze Cr(VI) in the parts per trillion range. Field tests were conducted at metal plating facilities, industrial cooling towers, municipal waste incinerators, sewage sludge incinerators, and hazardous waste incinerators. It was at the hazardous waste facility that the new method was proven to have acceptable precision and essentially no conversion in the sample train.