Laboratory and field evaluations of a methodology for determining hexavalent-chromium emissions from stationary sources. Final report

Technical Report · Tue Oct 01 04:00:00 EDT 1991

OSTI ID:6002207

Carver, A C

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.

• Research Organization: Entropy Environmentalists, Inc., Research Triangle Park, NC (United States)
• OSTI ID: 6002207
• Report Number(s): PB-92-101336/XAB; CNN: EPA-68-02-4550
• Country of Publication: United States
• Language: English

Related Subjects

29 ENERGY PLANNING, POLICY, AND ECONOMY
290300 -- Energy Planning & Policy-- Environment
Health
& Safety
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION
BENCH-SCALE EXPERIMENTS
CHROMATOGRAPHY
CHROMIUM
ECOLOGICAL CONCENTRATION
ELEMENTS
EVALUATION
FIELD TESTS
FLUE GAS
GASEOUS WASTES
INCINERATORS
ION EXCHANGE CHROMATOGRAPHY
LAWS
MEASURING METHODS
METALS
POLLUTION
POLLUTION LAWS
POLLUTION REGULATIONS
POLLUTION SOURCES
REGULATIONS
SEPARATION PROCESSES
STATIONARY POLLUTANT SOURCES
TESTING
TRANSITION ELEMENTS
US CLEAN AIR ACT
VALENCE
WASTES