TITLE
Evaluation of VOST and SemiVOST Methods for Halogenated Compounds
in the Clean Air Act Amendments Title III.  
  Validation Study at Fossil Fuel Plant


AUTHOR(S)
M. Jackson, J. Knoll, R. Midgett, J. McGaughey,
J. Bursey & R. Merrill

PERFORMING ORGANIZATION NAME AND ADDRESS
Radian Corporation, P.O. Box 13000
Research Triangle Park, NC 27709

SPONSORING AGENCY NAME AND ADDRESS
U.S. Environmental Protection Agency
Research Triangle Park, NC 27711

ABSTRACT
The Clean Air Act Amendments of 1990 (CAAA), Title III, present a
need for stationary source sampling and analytical methods for the
list of 189 toxic air pollutants.  The U.S. Environmental
Protection Agency (EPA) has used VOST and SemiVOST sampling and
analytical methods for a wide variety of volatile and semivolatile
organic compounds in the past, but these methodologies have been
completely validated for only a few of the organic compounds.  The
applicability of VOST and SemiVOST techniques to the halogenated
organic compounds listed in Title III of the Clean Air Act
Amendments of 1990 has been evaluated under laboratory conditions
for chromatographic separation, mass spectrometric response,
sorbent recovery and analytical method detection limit.  Dynamic
spiking techniques for the sampling trains (both gaseous and liquid
dynamic spiking) were also evaluated in the laboratory.  In this
study, the VOST and SemiVOST methods were evaluated in the field at
a fossil fuel power plant.  The source was selected to provide
actual stationary source emissions with the compounds of interest
present in trace amounts or not present.  Quadruple (Quad) sampling
trains with dynamic spiking were used to collect replicate samples
for statistical evaluation of the sampling and analytical
techniques for the complete method.  This paper presents the
results of the field validation of the VOST and SemiVOST sampling
and analytical methods.