TITLE
Stack Sampling Methods for Halogens and Halogen Acids

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
EPA Methods 26 and 26A and Proposed Methods 0050 and 0051 are in
widespread use for collection and quantitation of stationary source
emissions of halogens and halogen acids from a variety of source
types.  Considerable research has been conducted in evaluation of
these methods, but research information about the methods has not
been published in one convenient summary and much of the technical
community is unaware of its existence.

This paper provides historical and scientific background for the
EPA sampling methods in use today, along with some of their
strengths and limitations.  The primary evaluation studies are
summarized, and publication references are given.  The SW846
Methods Manual versions of the procedures are compared with the
versions from CFR40 part 60.  Relatively new research work is
summarized, along with recent changes in the methods, and critical
operating factors.