Demonstration of high-precision continuous measurements of water vapor isotopologues in laboratory and remote field deployments using wavelength-scanned cavity ring-down spectroscopy (WS-CRDS) technology
Demonstration of high-precision continuous measurements of water vapor isotopologues in laboratory and remote field deployments using wavelength-scanned cavity ring-down spectroscopy (WS-CRDS) technology
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DOI：
10.1002/rcm.4100
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发表时间：
2009-08-01
影响因子：
2
通讯作者：
Vaughn, Bruce H.
中科院分区：
文献类型：
--
作者：
Gupta, Priya;Noone, David;Vaughn, Bruce H.
本研究应用波长扫描光腔衰荡光谱技术（WS-CRDS）测量水的稳定同位素组成。该同位素水分析仪采用蒸发器系统，可以高精度地测量液态水和水蒸气。该分析仪可同时测定水样中（H2O）-O-18、（H2O）-O-16和（HDO）-O-16的含量。介绍了该仪器的室内试验和两次现场试验结果。这些试验的结果表明，同位素水分析仪可以对水的两种最常见的同位素物进行精确、准确的测量，并且几乎没有或没有仪器漂移。在实验室中，分析仪的Δ D精度为0.5/mil，Δ O-18精度为0.1/mil，这与实验室同位素比质谱仪获得的精度相似。在现场测量蒸汽样品时，分析仪的Δ D精度为每密耳1.0，Δ O-18精度为每密耳0.2。这些结果表明，同位素水分析仪是一个强大的工具，适用于广泛的应用和环境。版权所有（C）2009约翰威利父子有限公司
This study demonstrates the application of Wavelength-Scanned Cavity Ring-Down Spectroscopy (WS-CRDS) technology which is used to measure the stable isotopic composition of water. This isotopic water analyzer incorporates an evaporator system that allows liquid water as well as water vapor to be measured with high precision. The analyzer can measure (H2O)-O-18, (H2O)-O-16 and (HDO)-O-16 content of the water sample simultaneously. The results of a laboratory test and two field trials with this analyzer are described. The results of these trials show that the isotopic water analyzer gives precise, accurate measurements with little or no instrument drift for the two most common isotopologues of water. In the laboratory the analyzer has a precision of 0.5 per mil for delta D and 0.1 per mil for delta O-18 which is similar to the precision obtained by laboratory-based isotope ratio mass spectrometers. In the field, when measuring vapor samples, the analyzer has a precision of 1.0 per mil for delta D and 0.2 per mil for delta O-18. These results demonstrate that the isotopic water analyzer is a powerful tool that is appropriate for use in a wide range of applications and environments. Copyright (C) 2009 John Wiley & Sons, Ltd.