TITLE
Evaluation of Portable Multisorbent Air Samplers for Use with an
Automated Multitude Analyzer

AUTHOR(S)
Pollack, A.J., Gordon, S.M., and Moschandreas, D.J.*

PERFORMING ORGANIZATION NAME AND ADDRESS
Battelle      *Illinois Institute of Technology
Columbus, OH   Chicago, IL  60616-3799

SPONSORING AGENCY NAME AND ADDRESS
U.S. Environmental Protection Agency
Atmospheric Research & Exposure Assessment Laboratory
Methods Research & Development Division
Ambient Methods Research Branch, RTP, NC  27711

ABSTRACT
     The objective of this study was to evaluate the operational
characteristics of the Perkin-Elmer Model STS 25 Sequential Tube
Sampler and IITRI/IIT (IIT Research Institute/Illinois Institute of
Technology) Total Isolated-by-Microenvironment Exposure (TIME)
monitor.  Both units use multisorbent carbon-based sampling tubes
to collect volatile organic compounds (VOC's) in ambient air and an
analytical procedure that does not require cryogens for analysis. 
A Perkin Elmer Auto Thermal Desorption System (Model 4ATD 400) was
used to process the collection tubes for analyses of the target
species (VOC's listed in the EPA TO-14 method).  The Model STS 25
is designed to sample air with up to 24 tubes, one at a time for a
preset period of time.  The TIME monitor is designed to measure
total exposure to volatile organics and apportion the exposure into
its microenvironmental components indoor (workplace/residential),
outdoor or in-transit.  The TIME unit uses ultrasound reflection to
identify a subject's location.  Very good precision for collection
and analysis of these volatile organic compounds was achieved. 
Details of the study are presented along with recommendations for
further evaluation and developmental efforts for these samplers and
the sorbent/analytical methodology.