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Quantification of Elements in Cow Fur by Laser-Induced Breakdown Spectroscopy
Journal of Applied Spectroscopy ( IF 0.7 ) Pub Date : 2020-09-11 , DOI: 10.1007/s10812-020-01066-3
I. Cherni , S. Hamzaoui , N. Jaïdane

The purpose of this work is to report an analytical procedure to prove the validity of the hypothesis of the representativeness of the mass vaporized in the plasma plume of the studied sample. To achieve that, we used the laser-induced breakdown spectroscopy (LIBS) technique to analyze some minerals and trace elements in cow tail hair. First, hair samples were dissolved in nitric acid; then the solutions were analyzed by an atomic absorption spectrometer. Ca, Mg, and Na mass concentrations were determined for the 25 hair samples. Finally, a small amount of hair from every strand was cut in very small pieces and mixed with potassium bromide to make 12-mm diameter pellets. The laser was focused on the pellet surfaces, and the intensities of the emission lines of the studied elements were related to their absolute mass concentrations already measured. Experimental conditions were chosen to guarantee the reproducibility of ablations and to minimize the fluctuations of the ablated mass. In addition, local thermodynamic equilibrium was verified to prove the possibility of use of the theoretical model to obtain the variation of the emission line intensity as a function of the species concentration in the plasma plume.



中文翻译:

激光诱导击穿光谱法测定牛毛皮中的元素

这项工作的目的是报告一种分析程序,以证明所研究样品的等离子羽流中蒸发的物质的代表性的假设的有效性。为此,我们使用激光诱导击穿光谱(LIBS)技术分析了牛尾毛中的某些矿物质和微量元素。首先,将头发样本溶于硝酸中;然后用原子吸收光谱仪分析溶液。确定了25个头发样品的Ca,Mg和Na质量浓度。最后,将每根头发上的少量头发切成小块,并与溴化钾混合制成直径12毫米的小丸。激光聚焦在颗粒表面,研究元素的发射线强度与已经测量的绝对质量浓度有关。选择实验条件以确保消融的可重复性并使消融质量的波动最小化。此外,验证了局部热力学平衡,以证明使用理论模型获得发射线强度随等离子羽流中物种浓度变化的可能性。

更新日期:2020-09-11
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