TITLE
Field Test of a Generic Method for Halogenated Hydrocarbons:  A
VOST Test at a Chemical Manufacturing Facility Using a Modified
VOST Sampling Method.

AUTHOR(S)
James F. McCaughey, Joan T. Bursey, Raymond G. Merrill

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

SPONSORING AGENCY NAME AND ADDRESS
Atmospheric Research and Exposure Assessment Laboratory
U. S. Environmental Protection Agency
Research Triangle Park, NC 27711

ABSTRACT
A field test was performed to evaluate a possible replacement
sorbent for sampling volatile organic compounds in stationary
sources using SW-846 Method 0030.  On the basis of laboratory
results, Anasorb 747 was selected for testing in the field using
dynamic spiking procedures.  This modification of the VOST method
uses a single tube containing Anasorb 747 that is preceded by two
tubes containing Tenax.  The modified VOST method was compared in
the field with the VOST method using traditional adsorbents.  Both
the VOST and modified VOST used a quadruple probe and four similar
sampling trains.  Known amounts of the analytes were introduced
into the sampling trains, using the same certified compressed gas
cylinder as a source of test compounds.  As a general observation,
the recovery and precision of most compounds is improved by using
the modified VOST procedure.