Detection of lead in water using laser-induced breakdown spectroscopy and laser-induced fluorescence.
Detection of lead in water using laser-induced breakdown spectroscopy and laser-induced fluorescence.
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DOI：
10.1021/ac071573y
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发表时间：
2008-02
影响因子：
7.4
通讯作者：
S. Lui;Y. Godwal;M. Taschuk;Y. Tsui;R. Fedosejevs
中科院分区：
文献类型：
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作者：
S. Lui;Y. Godwal;M. Taschuk;Y. Tsui;R. Fedosejevs
激光诱导击穿光谱（LIBS）是一种众所周知的技术，用于快速，远离和无损分析样品的元素组成。在过去的几年里，我们一直在研究微LIBS，并展示其在表面微分析中的应用。最近，我们已经将微LIBS与激光诱导荧光（LIF）相结合，这种组合，激光烧蚀激光诱导荧光（LA-LIF），允许实现比传统LIBS高得多的灵敏度。在这项研究中，我们使用170微焦耳的激光脉冲烧蚀液体样品，以测量铅含量。所产生的等离子体由调谐到引线谐振线之一的10微焦耳激光脉冲重新激发。优化后，发现3sigma检测限为35 +/- 7 ppb，接近EPA饮用水中允许的铅水平标准。
Laser-induced breakdown spectroscopy (LIBS) is a well-known technique for fast, stand-off, and nondestructive analysis of the elemental composition of a sample. We have been investigating micro-LIBS for the past few years and demonstrating its application to microanalysis of surfaces. Recently, we have integrated micro-LIBS with laser-induced fluorescence (LIF), and this combination, laser ablation laser-induced fluorescence (LA-LIF), allows one to achieve much higher sensitivity than traditional LIBS. In this study, we use a 170 microJ laser pulse to ablate a liquid sample in order to measure the lead content. The plasma created was re-excited by a 10 microJ laser pulse tuned to one of the lead resonant lines. Upon optimization, the 3sigma limit of detection was found to be 35 +/- 7 ppb, which is close to the EPA standard for the level of lead allowed in drinking water.