US EPA Method 0061: Determination of Hexavalent Chromium Emissions from Stationary Sources
This method provides procedures for the determination of hexavalent chromium (Cr )
1.2 Range: If employing a preconcentration procedure, the lower limit of the detection range can be extended to 16 nanograms per dry standard cubic meter (ng/dscm) with a 3 dscm gas sample (0.1 ppb in solution). With sample dilution, there is no upper limit. Follow your manufacturer's specific instructions on employing the preconcentration procedure for these analyses.
+6 emissions from hazardous waste incinerators, municipal waste incinerators, municipal waste combustors, and sewage sludge incinerators. With the approval of the Administrator, this method may also be used to measure total chromium. The sampling train, constructed of Teflon components, has only been evaluated at temperatures of less than 300EF. Trains constructed of other materials, for testing at higher temperatures, are currently being evaluated.