利用激光诱导击穿光谱法和激光诱导荧光法检测水中的铅。

Detection of lead in water using laser-induced breakdown spectroscopy and laser-induced fluorescence.

作者信息

Lui Siu L, Godwal Yogesh, Taschuk Michael T, Tsui Ying Y, Fedosejevs Robert

机构信息

Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2V4.

出版信息

Anal Chem. 2008 Mar 15;80(6):1995-2000. doi: 10.1021/ac071573y. Epub 2008 Feb 16.

DOI:10.1021/ac071573y

PMID:18278880

Abstract

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.

摘要

激光诱导击穿光谱法（LIBS）是一种用于快速、远距离和无损分析样品元素组成的知名技术。在过去几年中，我们一直在研究微激光诱导击穿光谱法，并展示其在表面微分析中的应用。最近，我们将微激光诱导击穿光谱法与激光诱导荧光（LIF）相结合，这种组合，即激光烧蚀激光诱导荧光（LA-LIF），能够实现比传统激光诱导击穿光谱法更高的灵敏度。在本研究中，我们使用170微焦的激光脉冲烧蚀液体样品以测量铅含量。产生的等离子体由一个调谐到铅共振线之一的10微焦激光脉冲再次激发。经过优化，检测限的3σ为35±7 ppb，这接近美国环境保护局（EPA）规定的饮用水中铅允许含量标准。