磁场约束提高LIBS定量分析精度研究

对磁约束下激光诱导击穿光谱技术定量分析精度及检出限进行了专门研究。本文将磁场约束应用于LIBS技术中,选择Ni II 221.648 nm为镍元素分析线,Fe II 258.588 nm为内标元素谱线,利用标准不锈钢光谱样品303,304,316,321,347结合内标法进行不锈钢中Ni元素定标曲线拟合,用310样品光谱进行定标曲线精度分析及检出限分析。实验结果表明,磁场约束可以有效增强等离子体光谱强度,磁约束下内标法得到的定标曲线拟合系数更高,且310样品检测浓度较LIBS技术更为准确,Ni元素的探测下限降低了1.7倍。

Study on the quantitative analysis of magnetic field-enhanced LIBS

The quantitative analysis accuracy and detection limit of laser induced breakdown spectroscopy (LIBS) under magnetic constraints is studied.In this paper,the magnetic field constraint is applied to LIBS technology.Ni II 221.648 nm is selected as the analysis line of Ni element,Fe II 258.588 nm is the internal standard spectrum line,the standard stainless steel sample of 303,304,316,321,347 is used to carry out the Ni element calibration curve in stainless steel combined with the internal standard method,and the 310 stainless steel sample is used for calibration curve accuracy analysis and detection limit analysis.The experimental results show that the magnetic field constraint can effectively enhance the spectral intensity of the plasma,the calibration coefficient of the calibration curve obtained by the internal standard method is higher,and the detection concentration of the 310 sample is more accurate than the LIBS technique.The detection limit of the Ni element is decreased by 1.7 times compared to traditional LIBS.