Measurement & Monitoring: 18th Quarterly Literature Update

نویسنده

  • E. H. Daughtrey
چکیده

24-Hour Diffusive Sampling of 1,3-Butadiene in Air onto Carbopack X Solid Adsorbent Followed by Thermal Desorption/GC/MS Analysis: Feasibility Study McClenny, W.A., D.A. Whitaker, K.D. Oliver, H.H. Jacumin Jr., and E.H. Daughtrey Jr. Symposium on Air Quality Measurement Methods and Technology, Research Triangle Park, NC, April 20-22, 2004 [EPA 600-04-062; NTIS PB2004-106812] Diffusive sampling of 1,3-butadiene for 24 hr onto the graphitic adsorbent Carbopack X packed in a stainless steel tube badge (6.3 mm o.d., 5 mm i.d., and 90 mm in length) with analysis by thermal desorption/gas chromatography (GC)/mass spectrometry (MS) has been evaluated in controlled tests. A test matrix of 42 trace-level volatile organic compounds (VOCs) in humidified zero air was established by dynamic dilution of compressed gas standards flowing through an environmental chamber. Conditions for both automated thermal desorption of the badge, including pre-desorption dry purging, and GC/MS analyses (column flow rate and temperature programming profile) were optimized for specificity, precision, and sensitivity of response. Analytical system responses for sets of tubes exposed to a given 1,3-butadiene concentration were typically precise, e.g., a % RSD < 10% at 1.1 ug/m3 (0.5 ppbv), and system response was approximately linear with concentration over the range 0-9 ug/m3. No significant systematic variations of response were observed for changes in sample humidity and temperature (35% and 75% RH at 16, 20, and 29 degrees C). Loss of 1,3-butadiene from the tube badge due to reverse diffusion into clean air over 12 hr after an initial 12-hr exposure at 9 ug/m3 gave an 11% response decrease. Adding 100 ppbv (~200 ug/m3) of ozone during the second 12 hr caused no additional response change.

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تاریخ انتشار 2006