TITLE
Sampling of Volatile Organic Compounds From Combustion Sources
Using Tedlar Bags With Analysis by GC/MS

AUTHOR(S)
Rohini Kanniganti, Richard L. Moreno, Joan T. Bursey, Raymond G.
Merrill (Radian Corp.) Robert G. Fuerst & Larry D. Johnson
(USEPA/AREAL/MRDD/SMRB)

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

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

ABSTRACT
     This article reports on preliminary efforts to develop a new
method designated as (SW-846, Method 0040), for collecting volatile
organic compounds from stack gas emissions.  In Method 0040, a
sample is withdrawn from the stack through a heated sample probe
and filter and is then passed through a condenser where the
moisture and condensable components are removed.  The gaseous
emissions are then collected in a Tedlar bag, held in a rigid
opaque container.  The dry gas sample and the collected condensate
are then transported to a lab for GC/MS analysis.  
     Laboratory experiments were conducted to determine
reproducibility of sample injection, preparation of Tedlar bag
standards, instrument detection limits and dynamic spiking.
     The reproducibility of sample injections was evaluated.  The
percent difference between repeated injections was less than 4
percent.  Two different Tedlar bag standard preparation techniques
were evaluated using a stock gas cylinder containing 6 analytes. 
One allowed a gaseous standard to flow into the bag simultaneously
with the diluent  gas.  The other was a step-wise spiking of the
compound into a bag already partially filled with nitrogen, and
then adding the rest of the nitrogen needed for dilution.  The
step-wise procedure showed greater accuracy, higher precision and
higher compound responses.  The detection levels of the 6 analytes
were determined.  Dynamic spiking into a sampling train using the
6 analytes was also evaluated.