Use of the optogalvanic effect (OGE) for isotope ratio spectrometry of 13CO2 and 14CO2.
Use of the optogalvanic effect (OGE) for isotope ratio spectrometry of 13CO2 and 14CO2.
复制标题
利用光电池效应 (OGE) 进行 13CO2 和 14CO2 同位素比光谱测定。
DOI：
10.1080/10256010500384440
复制
发表时间：
2005
影响因子：
1.3
通讯作者：
Okil,JosephO
中科院分区：
文献类型：
--
作者：
Murnick,DanielE;Okil,JosephO
使用同位素二氧化碳激光器测定碳（和氧）同位素比于1994年首次得到证实。从那时起，一种名为LARA™的商业设备已经制造出来，并使用13 C标记的尿素进行幽门螺杆菌呼气测试。与其他红外吸收同位素比测量技术相比，光电流效应的主要优点是它没有光学背景，并且由于信号增益与激光功率成正比而具有高灵敏度。使用标准品和样品两个单元进行连续标准化，可实现高准确度和精密度。本文介绍了连续流动法测定空气中CO2的13 C/12 C比值的最新进展以及将该技术推广到可作为稳定同位素分析的14 C。
The use of isotopic carbon dioxide lasers for determination of carbon (and oxygen) isotope ratios was first demonstrated in 1994. Since then a commercial device called LARA™, has been manufactured and used forHelicobacter pyloribreath tests using13C-labelled urea. The major advantages of the optogalvanic effect compared with other infrared absorption isotope ratio measurement techniques are its lack of optical background and its high sensitivity resulting from a signal gain proportional to laser power. Continuous normalisation using two cells, a standard and sample, lead to high accuracy as well as precision. Recent advances in continuous flow measurement of13C/12C ratios of CO2in air and extensions of the technique to14C, which can be analysed as a stable isotope, are described.