TITLE
COMPARISON OF TRANSFER OF SURFACE CHLORPYRIFOS RESIDUES FROM CARPET
BY THREE DISLODGEABLE RESIDUE METHODS

AUTHOR(S)
Camann, D.E., Harding, H.J. Agrawal, S.R., Lewis, R.G.

PERFORMING ORGANIZATION NAME AND ADDRESS
Southwest Research Institute
San Antonio, Texas

SPONSORING AGENCY NAME AND ADDRESS
U. S. Environmental Protection Agency
Research Triangle Park, NC

ABSTRACT
     After chlorpyrifos, which was broadcast-sprayed on carpet, had
dried, transfers by the Dow drag sled, the California cloth roller,
and the Southwest Research Institute polyurethane foam (PUF) roller
were compared.  On plush nylon carpet, mean chlorpyrifos transfers
were 4.5% by the cloth roller, 1.1% by the drag sled, and 0.65% by
the PUF roller.  On level-loop polypropylene carpet, mean transfers
were 2.5% by the cloth roller, 1.4% by the drag sled, and 1.2% by
the PUF roller.  The cloth roller was found to be less suitable
than the other methods because its transfers exhibited greater
variability and were altered by orientation of the roll relative to
the lay of the carpet fibers.  Moistening the sampling media
increased the transfer by the drag sled and the PUF roller, but
substantially increased the measurement variability of both
methods.