Verification of diffusive and pumped samplers for volatile organic compounds using a controlled atmosphere test facility

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• 作者：Nicholas A. Martin ; Edward J. Leming ; Malcolm H. Henderson ; Robert P. Lipscombe ; John K. Black ; Scott D. Jarvis
• 关键词：Sorbents ; Test atmosphere ; Diffusive uptake rates ; Pumped samplers ; Volatile organic compounds ; Environmental level
• 刊名：Atmospheric Environment
• 出版年：2010
• 出版时间：September 2010
• 年：2010
• 卷：44
• 期：28
• 页码：3378-3385
• 全文大小：616 K

文摘

There is a requirement to verify the performance of sorbent-based passive or active samplers and to extend their use, where possible, to monitor volatile organic compounds (VOCs) that are known to be photochemical ozone pre-cursors or are relevant to the activities of the petrochemical industry. We report measurements of the 14-day diffusive uptake rates for the VOCs: i-butane (2-methyl propane), n-butane, i-pentane (2-methyl butane), n-pentane, n-hexane, benzene, toluene, and m-xylene (at environmental level concentrations) for industry standard axial samplers (Perkin–Elmer-type samplers) containing the sorbents Carbopack-X, -Z, -B or Tenax-TA. We also present data on back-diffusion, blank levels, and storage for the above sorbents, and describe the simultaneous use of the sorbent Carbopack-X for pumped sampling of certain VOCs. The results were obtained by dosing samplers in a controlled atmosphere test facility (CATFAC) operating under well-defined conditions of concentration, nominal temperature of 20 °C, wind speed of 0.5 m s⁻¹, and relative humidities of 0 % and 80 % . Field measurements were also obtained to provide supplementary data to support the laboratory study. Results are compared to existing published data, where these are available.