激光诱导击穿光谱
检出限
材料科学
分析化学(期刊)
大气(单位)
激光器
再现性
谱线
光学
光谱学
标准差
灵敏度(控制系统)
化学
物理
统计
数学
色谱法
量子力学
天文
电子工程
工程类
热力学
作者
Honglian Li,Chun Wang,Yitong Wang,Shijie Fu,Lide Fang
标识
DOI:10.1088/1361-6501/acdc44
摘要
Abstract To effectively improve the quality of laser-induced plasma spectra and the detection accuracy of laser-induced breakdown spectroscopy (LIBS) simultaneously for Sr element in soil, the dual mechanism of N 2 atmosphere combined with cylindrical cavity confinement for laser-induced Sr plasma emission enhancement was proposed and investigated in this paper, and a multi-spectral fusion internal standard analysis model was established. Optimum enhancement effect can be achieved under the conditions of 2 mm diameter and 6 mm height of the confinement cavity in N 2 atmosphere, where the enhancement factor was about 3.25, the signal-to-noise ratio reached 710.28, and the LIBS spectrum quality was the best; the relative standard deviation value (2.64%) was the smallest, and the LIBS signal reproducibility was the best. For the samples in this study, the limit of detection of the sample Sr elements under the dual enhancement mechanism was 34.60 mg kg −1 , which was 40.43% lower than the limit of detection (LOD) without enhancement mechanism (58.08 mg kg −1 ), and the R 2 of the multispectral fusion internal standard model was 1.23% higher and the relative error was 3.41% lower than that of the internal standard method. The results showed that the dual enhancement mechanism combining N 2 atmosphere and cylindrical cavity confinement improved the spectral quality, signal reproducibility, and detection sensitivity.
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