Study of matrix effects in laser-induced breakdown spectroscopy by laser defocus and temporal resolution,Journal of Analytical Atomic Spectrometry

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Study of matrix effects in laser-induced breakdown spectroscopy by laser defocus and temporal resolution
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2021-07-27 , DOI: 10.1039/d1ja00179e
Wei Wang _{1,

2,

3,

4,

5} , Lanxiang Sun _{1,

2,

3,

4,

5} , Peng Zhang _{1,

2,

3,

4,

5} , Tong Chen _{1,

2,

3,

4,

5} , Liming Zheng _{1,

2,

3,

4,

5} , Lifeng Qi _{1,

2,

3,

4,

5}

Affiliation

The laser-induced breakdown spectroscopy (LIBS) analysis method displays significant matrix effects which greatly hinder the application of this technology. Even if the concentration of a certain element is constant, the physical properties and composition of the sample will affect the element signal. In order to further deepen the understanding of matrix effects, in this paper, the effect of matrix effects (Al matrix and Fe matrix) on the quantitative analysis of Si, Mn, Cr and Cu under different laser defocusing amounts and spectrometer delays is researched. This study found that the matrix effects have different degrees of effect on the analysis line under different experimental parameters. Moreover, the effect of the matrix effects can be reduced by adjusting the laser defocus amount and spectrometer delay. In addition, taking the spectrum generated by the pure sample as the matrix background and subtracting the intensity value of the matrix background at the analysis line can reduce the interference of the matrix effects. After deducting the matrix background, the determination coefficient of mixed quantitative analysis of the three elements Si, Cu, and Cr in Al and Fe matrixes can reach more than 0.99. Besides, for the Mn 257.6 nm, which is severely interfered by the spectrum of the Al matrix and Fe matrix, respectively, the determination coefficient of the mixed quantitative analysis can reach 0.9855.

中文翻译：

通过激光散焦和时间分辨率研究激光诱导击穿光谱中的基质效应

激光诱导击穿光谱（LIBS）分析方法显示出显着的基体效应，极大地阻碍了该技术的应用。即使某种元素的浓度恒定，样品的物理性质和成分也会影响元素信号。为了进一步加深对基体效应的理解，本文研究了基体效应（Al基体和Fe基体）在不同激光散焦量和光谱仪延迟下对Si、Mn、Cr和Cu定量分析的影响。本研究发现，在不同的实验参数下，基体效应对分析线有不同程度的影响。此外，可以通过调整激光散焦量和光谱仪延迟来减少矩阵效应的影响。此外，以纯样品产生的光谱作为基体背景，在分析线处减去基体背景的强度值，可以减少基体效应的干扰。扣除基体背景后，Al、Fe基体中Si、Cu、Cr三种元素混合定量分析测定系数可达0.99以上。此外，对于分别受到Al基体和Fe基体光谱干扰的Mn 257.6 nm，混合定量分析的测定系数可达0.9855。Al、Fe基体中Si、Cu、Cr三种元素混合定量分析测定系数可达0.99以上。此外，对于分别受到Al基体和Fe基体光谱干扰的Mn 257.6 nm，混合定量分析的测定系数可达0.9855。Al、Fe基体中Si、Cu、Cr三种元素混合定量分析测定系数可达0.99以上。此外，对于分别受到Al基体和Fe基体光谱干扰的Mn 257.6 nm，混合定量分析的测定系数可达0.9855。

更新日期：2021-08-09

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