Griffith David W T, Jamie Ian, Esler Michael, Wilson Stephen R, Parkes Stephen D, Waring Christopher, Bryant Glenn W
Atmospheric Chemistry Research Group, University of Wollongong, Wollongong, NSW 2522, Australia.
Isotopes Environ Health Stud. 2006 Mar;42(1):9-20. doi: 10.1080/10256010500503098.
Continuous records of isotope behaviour in the environment are invaluable to understanding mass and energy fluxes. Although techniques such as isotope ratio mass spectrometry provide high precision data, they are not well suited to the analysis of a large number of samples and are currently restricted to use in the laboratory. Fourier transform infrared spectrometers are relatively cheap and sufficiently portable and robust to be taken into the field to collect continuous records of gas-phase isotope behaviour. Several examples of the application of this technique will be presented. One data set provides half-hourly determinations of vertical profiles of D/H in water vapour above agricultural fields over a 3-week period; the same infrared spectra can also be used to determine 13C/12C in CO2. The technique has also been applied to the study of CO2 in ambient air and in a limestone cave system. Some of the features and complications associated with the method will also be considered.
环境中同位素行为的连续记录对于理解质量和能量通量非常重要。尽管同位素比率质谱等技术能提供高精度数据，但它们不太适合大量样本的分析，目前仅限于实验室使用。傅里叶变换红外光谱仪相对便宜，便于携带且坚固耐用，可带到野外收集气相同位素行为的连续记录。将展示该技术应用的几个例子。一组数据集提供了为期3周的农田上方水汽中D/H垂直剖面的半小时测定数据；同样的红外光谱还可用于测定二氧化碳中的13C/12C。该技术也已应用于对环境空气中二氧化碳以及石灰岩洞穴系统中二氧化碳的研究。还将考虑与该方法相关的一些特点和复杂情况。
