TITLE
Analysis of Modified Method Five Train Samples for Multiple
Pollutant Classes


AUTHOR(S)
Larry D. Johnson

PERFORMING ORGANIZATION NAME AND ADDRESS
National Exposure Research Laboratory
Office of Research and Development
U.S. Environmental Protection Agency
Research Triangle Park, NC 27711

SPONSORING AGENCY NAME AND ADDRESS
National Exposure Research Laboratory
Office of Research and Development
U.S. Environmental Protection Agency
Research Triangle Park, NC 27711

ABSTRACT
     The steadily increasing need for more complete
characterization of stationary source emissions has placed more
demands on stack sampling organizations and on associated
analytical laboratories to operate as efficiently as possible.  One
way of increasing efficiency is to maximize the amount of analysis
on each sample collected, and thereby to minimize the number of
samples taken.  The Modified Method 5 (MM5) sampling method
produces samples which are particularly amenable to analysis for
multiple organic pollutants. Success in executing a combination of
two or more methods requires a thorough knowledge of the sampling
method as well as the analysis procedures.  Although verbal
direction has been offered to individuals, no published technical
guidance has been available.  This paper discusses basic principles
of planning analysis of MM5 samples for more than one class of
pollutants.  Benefits and liabilities of combinations of this
nature are examined.  An example case involving analysis of dioxins
and polycyclic aromatic hydrocarbons is presented.