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Rapid and Precise Analysis of Carbon Dioxide Clumped Isotopic Composition by Tunable Infrared Laser Differential Spectroscopy.
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-01-07 , DOI: 10.1021/acs.analchem.9b04466 Zhennan Wang 1 , David D Nelson 2 , David L Dettman 1 , J Barry McManus 2 , Jay Quade 1 , Katharine W Huntington 3 , Andrew J Schauer 3 , Saburo Sakai 4
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-01-07 , DOI: 10.1021/acs.analchem.9b04466 Zhennan Wang 1 , David D Nelson 2 , David L Dettman 1 , J Barry McManus 2 , Jay Quade 1 , Katharine W Huntington 3 , Andrew J Schauer 3 , Saburo Sakai 4
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The high precision measurement of doubly substituted ("clumped") isotopologues in CO2 is a topic of significant interest in isotope geochemistry. Here we describe the performance of a new isotope ratio laser spectrometer using tunable infrared laser differential absorption spectroscopy (TILDAS). The TILDAS instrument has two continuous-wave lasers to simultaneously measure the four isotopologues involved in the 12C16O2 + 13C16O18O ⇆ 13C16O2 + 12C16O18O exchange reaction. CO2 samples are trapped in a low volume (∼250 mL) optical multipass cell with a path length of 36 m. Each sample is compared to a reference gas, and clumped isotopologue precision of 0.01‰ (SE) is achieved within 20 min for 15 μmol samples. Similar precision is also achieved for bulk isotopic composition. The degree of rare isotope clumping in excess of strictly random distribution (Δ16O13C18O) measured by this TILDAS instrument varies linearly with theoretically calculated values and shows a very weak dependence on bulk isotopic composition.
中文翻译：
通过可调红外激光微分光谱技术快速准确地分析二氧化碳的同位素组成。
二氧化碳中双取代（“团块”）同位素的高精度测量是同位素地球化学中非常感兴趣的主题。在这里，我们描述了使用可调红外激光差动吸收光谱法（TILDAS）的新型同位素比激光光谱仪的性能。TILDAS仪器具有两个连续波激光器，可同时测量12C16O2 + 13C16O18O + 13C16O2 + 12C16O18O交换反应中涉及的四个同位素。CO2样品被捕集在路径长度为36 m的小体积（〜250 mL）光学多通池中。将每个样品与参考气体进行比较，对于15μmol样品，在20分钟内可达到0.01‰（SE）的团聚同位素精度。整体同位素组成也达到了类似的精度。
更新日期：2020-01-08
中文翻译：
通过可调红外激光微分光谱技术快速准确地分析二氧化碳的同位素组成。
二氧化碳中双取代（“团块”）同位素的高精度测量是同位素地球化学中非常感兴趣的主题。在这里，我们描述了使用可调红外激光差动吸收光谱法（TILDAS）的新型同位素比激光光谱仪的性能。TILDAS仪器具有两个连续波激光器，可同时测量12C16O2 + 13C16O18O + 13C16O2 + 12C16O18O交换反应中涉及的四个同位素。CO2样品被捕集在路径长度为36 m的小体积（〜250 mL）光学多通池中。将每个样品与参考气体进行比较，对于15μmol样品，在20分钟内可达到0.01‰（SE）的团聚同位素精度。整体同位素组成也达到了类似的精度。
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