TITLE
Evaluation of VOST and SemiVOST Methods for Halogenated Compounds
in the Clean Air Act Amendments Title III, Bench and Laboratory
Studies

AUTHOR(S)
Merrill Jackson, Joseph Knoll, Rodney Midgett,   Joan Bursey,
Robert McAllister, Raymond Merrill, Jr.

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, Office of Research and
Development, AREAL/MRDD/SMRB (MD-77A), Research Triangle Park, NC
27711


ABSTRACT
The Clean Air Act Amendments of 1990, Title III, present a need for
stationary source sampling and analytical methods for the list of
189 compounds. EPA has used VOST and SemiVOST sampling and
analytical methods for this type of sampling of organic compounds
in the past, but these methodologies have been completely validated
for only a few of the organic compounds. In this study, the
applicability of VOST and SemiVOST techniques to the Clean Air Act
halogenated compounds has been evaluated under laboratory
conditions. The methods were evaluated first to determine whether
the compounds could be analyzed successfully. For SemiVOST and VOST
compounds, the analytes were analyzed by GC/MS techniques.
Retention times for the analytes were determined, and reference
spectra were generated so that primary quantitation ions could be
selected. Recovery of the compounds from the sorbents was
evaluated, and analytical detection limits were determinated from
spiked sorbents. Quadruple sampling trains were used to collect
replicate samples for statistical evaluation of the dynamic spiking
techniques for liquids (SemiVOST). This paper presents the results
of the laboratory experiments.