Infrared Hollow Waveguide Sensors for Simultaneous Gas Phase Detection of Benzene, Toluene, and Xylenes in Field Environments
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- 作者：Christina R. Young ; Nicola Menegazzo ; Andrew E. Riley ; Cornelius H. Brons ; Frank P. DiSanzo ; Jacquelyn L. Givens ; John L. Martin ; Mark M. Disko ; Boris Mizaikoff
- 刊名：Analytical Chemistry
- 出版年：2011
- 出版时间：August 15, 2011
- 年：2011
- 卷：83
- 期：16
- 页码：6141-6147
- 全文大小：967K
- 年卷期：v.83,no.16(August 15, 2011)
- ISSN：1520-6882
文摘
Simultaneous and molecularly selective parts-per-billion detection of benzene, toluene, and xylenes (BTX) using a thermal desorption (TD)-FTIR hollow waveguide (HWG) trace gas sensor is demonstrated here for the first time combining laboratory calibration with real-world sample analysis in field. A calibration range of 100鈥?000 ppb analyte/N2 was developed and applied for predicting the concentration of blinded environmental air samples within the same concentration range, and demonstrate close agreement with the validation method used here, GC-FID. The analyte concentration prediction capability of the TD-FTIR-HWG trace gas sensor also compares well with the industrial standard and other experimental techniques including GC-PID, ultrafast GC-FID, and GC-DMS, which were simultaneously operated in the field. With the advent of a quantum cascade laser with emission frequencies specifically tailored to efficiently overlap benzene absorption as the most relevant analyte, the overall sensor footprint could be considerably reduced to ultimately yield hand-held trace gas sensors facilitating direct and real-time detection of BTX in air down to low ppb levels.