Record Display for the EPA National Library Catalog


Main Title Presence of Dichloromethane on Cleaned XAD-2 Resin: A Potential Problem and Solutions.
Author Chuang, J. C. ; Holdren, M. W. ; Wilson., N. K. ;
CORP Author Battelle Columbus Div., OH.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher c1990
Year Published 1990
Report Number EPA-68-02-4127; EPA/600/J-90/155;
Stock Number PB91-109934
Additional Subjects Air pollution control ; Chemical cleaning ; Solvent extraction ; Concentration(Composition) ; Fluidizing ; Adsorbents ; Chemical analysis ; Gas chromatography ; Reprints ; Indoor air pollution ; Methane/dichloro ; XAD resins ; Air pollution sampling ; Air pollution detection
Library Call Number Additional Info Location Last
NTIS  PB91-109934 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 6p
Preparation of XAD-2 resin for indoor air sampling with commonly used cleaning methods, such as Soxhlet extraction with dichloromethane (DCM) followed by vacuum drying and nitrogen purging, can lead to elevated DCM levels (>100 ppb) in the sampled indoor air, which result from DCM remaining in the resin after cleaning. Since DCM is a suspect human carcinogen, indoor human exposure to DCM should be minimized. Several procedures to remove residual DCM after Soxhlet extraction were evaluated. Removal by fluidizing the XAD-2 resin bed in a drying column with a nitrogen stream at 40C was best. The effectiveness of this procedure was demonstrated in parallel air sampling with a syringe sampler and with a prototype quiet sampler equipped with a quartz fiber filter and an XAD-2 cartridge in series. Sampling was conducted in an office and in residences. With the modified procedures, indoor DCM levels were at typical indoor values (<10 ppb). (Copyright (c) 1990 American Chemical Society.)