文章基本信息

标题：Laser Spectroscopic Analysis of Stable Isotopes in Natural Waters
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期刊名称：Water & Environment News
电子版ISSN：1020-7120
出版年度：2007
卷号：2007
期号：23
页码：2-2
出版社：IAEA
摘要：Applications of isotopes for understanding hydrological processes were essentially made possible by Nier’s development of a dual-inlet mass-spectrometer in the late 1940s (Nier, 1947). Yet, the relatively high operational skill and cost of mass spectrometers used for measuring stale isotope ratios also has limited the more widespread use of isotopes by hydrologists in general although stable isotopes of oxygen and hydrogen in natural waters have proven to be effective tracers of the terrestrial water cycle. Less expensive and easy-to-operate spectroscopic methods using lasers have been developed for some time but have lacked the ability to provide results with sufficient precision necessary for hydrological applications. A laser spectroscopic machine has recently been developed that uses a cavity with high-reflectivity mirrors to generate path lengths of several kilometres, resulting in clear separation of different masses, promising measurements with the accuracy and precision required for hydrological samples. The performance of this laser machine, developed by Los Gatos Research, Inc., in California, USA, was tested with a number of secondary standards calibrated on the VSMOW scale and natural water samples.