Demonstration of a Mid-Infrared Cavity Enhanced Absorption Spectrometer for Breath Acetone Detection

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• 作者：Luca Ciaffoni ; Gus Hancock ; Jeremy J. Harrison ; Jean-Pierre H. van Helden ; Cathryn E. Langley ; Robert Peverall ; Grant A. D. Ritchie ; Simon Wood
• 刊名：Analytical Chemistry
• 出版年：2013
• 出版时间：January 15, 2013
• 年：2013
• 卷：85
• 期：2
• 页码：846-850
• 全文大小：285K
• 年卷期：v.85,no.2(January 15, 2013)
• ISSN：1520-6882

文摘

A high-resolution absorption spectrum of gaseous acetone near 8.2 渭m has been taken using both Fourier transform and quantum cascade laser (QCL)-based infrared spectrometers. Absolute absorption cross sections within the 1215鈥?222 cm^鈥? range have been determined, and the spectral window around 1216.5 cm^鈥? (蟽 = 3.4 脳 10^鈥?9 cm² molecule^鈥?) has been chosen for monitoring trace acetone in exhaled breath. Acetone at sub parts-per-million (ppm) levels has been measured in a breath sample with a precision of 0.17 ppm (1蟽) by utilizing a cavity enhanced absorption spectrometer constructed from the QCL source and a linear, low-volume, optical cavity. The use of a water vapor trap ensured the accuracy of the results, which have been corroborated by mass spectrometric measurements.