TITLE
Preparation of the Components of the Modified Method 5 (Method
0010) Sampling Train for Analysis by SW-846 Method 8270

AUTHOR(S)
James F. McGaughey, Raymond G. Merrill, Jr., Joan T. Bursey, and
Denny E. Wagoner, Radian Corporation, Merrill D. Jackson and Larry
D. Johnson, EPA

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

SPONSORING AGENCY NAME AND ADDRESS
U.S. Environmental Protection Agency
SMRB, MRDD, AREAL, ORD
Research Triangle Park, North Carolina  27711

ABSTRACT
     To validate a source test method for EPA use, data on the
method's accuracy and precision must be obtained at, at least, two
different locations.  While evaluating a new method for measuring
source emissions of semivolatile halogenated compounds, data at one
source were significantly different from previous laboratory and
field measurements.  Recoveries at this source, a chemical
manufacturing facility with substantial moisture in the exhaust
stream, were unacceptably low, ranging from 4 to 63 percent. 
Because these results were at variance with previous results, the
sampling and analysis procedures were evaluated in detail.  The
quality control samples isolated the problem to the analysis
procedures associated with transfer and extraction of the XAD-2
adsorbent, which was wet when it returned from the field test at
this site.  Sample preparation procedures had generally followed
those specified by the Semi-Volatile Organic Sampling Train method
(Semi-VOST; SW-846 Method 0010), but additional procedures, not
specifically prohibited by the standard method, were utilized to
extract the wet XAD-2 from the sample train before extraction and
analysis.  These techniques changed the nature of the resulting
extract and suppressed recovery of the target compounds.  A new
protocol has been developed to address sample handling for XAD-2
under such conditions.