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PRESENCE OF DICHLOROMETHANE ON CLEANED XAD-2 RESIN: A POTENTIAL PROBLEM AND SOLUTIONS
Citation:
Chuang, J., M. Holdren, AND N. Wilson. PRESENCE OF DICHLOROMETHANE ON CLEANED XAD-2 RESIN: A POTENTIAL PROBLEM AND SOLUTIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-90/155 (NTIS PB91109934), 1990.
Description:
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. ince DCM is a suspect human carcinogen, indoor human exposure to DCM should be minimized. everal procedures to remove residual DCM after Soxhlet extraction were evaluated. emoval by fluidizing the XAD-2 resin bed in a, drying column with a nitrogen stream at 40 degrees C was best. he 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 XAD2 cartridge in series. ampling was conducted in an office and in residences. ith the modified procedures, indoor DCM levels were at typical indoor values (<10 ppb).
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PRESENCE OF DICHLOROMETHANE ON CLEANED XAD-2 RESIN: A POTENTIAL PROBLEM AND SOLUTIONS