Quantitative isotopic measurements of gas-phase alcohol mixtures using a broadly tunable swept external cavity quantum cascade laser

被引：11

作者：

Brumfield, B. E. ^{[1
]}

Phillips, M. C. ^{[1
]}

机构：

[1] Pacific Northwest Natl Lab, Richland, WA 99352 USA

来源：

ANALYST | 2017年 / 142卷 / 13期

关键词：

RATIO MEASUREMENTS; SPECTROSCOPY; SENSOR; ARRAY; N2O; AIR;

D O I：

10.1039/c7an00223h

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A swept-ECQCL is used for broadband IR spectroscopy of isotopic mixtures of CH3OH, CH3OD, CH3CH2OH, and CH3CH2OD in a static gas cell over a wavelength range of 9.5 to 10.4 mu m. A weighted least squares fitting approach with quantitative library spectra illustrates that significant spectral congestion does not negatively impact the ability for in situ quantification of large isotopic species in a mixture. The noise equivalent concentrations for CH3OH, CH3OD, CH3CH2OH, and CH3CH2OD are 19 ppbv m, 28 ppbv m, 450 ppbv m, and 350 ppbv m respectively for a 50 seconds integration time. Based on the observed NECs, isotopic precisions of 0.07% and 0.79% for a 50 s integration time are calculated for measurements of the [MeOD]/[MeOH] and [EtOD]/[EtOH] isotope ratios, respectively, for the species concentrations in the gas cell.

引用

收藏

页码：2354 / 2362

页数：9

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