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
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB91-109934 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
6p |
Abstract |
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.) |