Huang Ji-Song, Chen Qiao-Ling, Zhao Wei-Dong
College of Information Optics, Zhejiang Normal University, Jinhua 321004, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2009 Nov;29(11):3126-9.
As a powerful and promising analytical technique, laser-induced breakdown spectroscopy (LIBS) has been undergoing a rapid development in the past years. LIBS technique allows for rapid, multi-elemental, in situ measurements, and has been proposed for real time soil analysis. Currently, a global effort is focused on how to further improve the analytical accuracy and repeatability of this promising technique. In the present paper, a method of laser induced breakdown spectroscopy (LIBS) for the determination of Cr and Sr in soil was established. The experimental instrument was mainly equipped with a pulsed 1 064 nm Nd : YAG laser and a portable spectrometer. The behavior of shot to shot variation in spectra line intensity emitted by the laser plasma was studied. Data acquisition and processing procedures were experimentally optimized. The precision of the method was, in terms of RSD, 9.02% for Cr 425.44 nm and 10.5% for Sr 460.73 nm respectively (n = 8). Detection limits were 25.3 mg x g(-1) for Cr and 15.2 mg x g(-1) for Sr in soil respectively. These results are better than the data reported in literature, indicating that the established LIBS method is suitable for the determination of heavy metal in soil.
作为一种强大且有前景的分析技术，激光诱导击穿光谱法（LIBS）在过去几年中一直在快速发展。LIBS技术能够进行快速、多元素的原位测量，并已被用于土壤实时分析。目前，全球都在致力于如何进一步提高这种有前景技术的分析准确性和重复性。在本文中，建立了一种利用激光诱导击穿光谱法（LIBS）测定土壤中铬和锶的方法。实验仪器主要配备了一台脉冲1064nm钕钇铝石榴石激光器和一台便携式光谱仪。研究了激光等离子体发射光谱线强度的逐次变化行为。通过实验优化了数据采集和处理程序。该方法的精密度，以相对标准偏差（RSD）表示，对于铬在425.44nm处为9.02%，对于锶在460.73nm处为10.5%（n = 8）。土壤中铬的检测限分别为25.3mg·g⁻¹，锶的检测限分别为15.2mg·g⁻¹。这些结果优于文献报道的数据，表明所建立的LIBS方法适用于土壤中重金属的测定。
