Application of internal standard element strength-screening method in quantitative analysis of aluminum alloy samples by laser induced breakdown spectroscopy
WANG Hua-li, ZHAO Shu-rui, LU Meng-ke, ZHAO Zhi-wei
College of Automobile and Electronic Engineering, Baoding University, Baoding 071000, China
Abstract：During the quantitative analysis by laser induced breakdown spectroscopy (LIBS), some problems such as poor limit of detection and low measurement accuracy were usually caused due to unstable experimental conditions, which have been concerned by researchers. The aluminum alloy certified reference materials were selected as the analytical samples. The Nd∶YAG laser with wavelength of 1064nm was employed as the excitation source, and the pulse repetition frequency was set at 1Hz. The plasma spectra of samples in range of 260-300nm and 300-330nm were collected by the laser induced breakdown spectroscopy. The data were processed with internal standard element strength-screening method based on internal standard method. The contents of Mn, Mg, Fe and Cu in aluminum alloy sample E113 were analyzed and compared with the results obtained by conventional data averaging method. The measured mass fraction for Mn, Mg, Fe and Cu was 5.92, 4.79, 4.06 and 39.00mg/g, respectively. The relative error of determination results was reduced from 9.80%, 3.70%, 13.30% and 3.47% of the data averaging method to 5.52%, 0.40%, 4.92% and 3.23%, respectively. Meanwhile, the limit of detection of Mn, Mg, Fe and Cu was reduced from 0.205, 0.207, 0.755 and 6.150mg/g of the data averaging method to 0.163, 0.176, 0.674 and 1.71mg/g, respectively. The results indicated that the data pretreatment method by data screening based on spectral line strength of internal standard elements was also suitable for the analysis of aluminum alloy samples with similar contents of matrix element. The experimental results could basically meet the requirements of quantitative analysis for metal samples. This data processing method provided a new idea for the quantitative analysis of elements under unstable experimental conditions.
王华丽, 赵书瑞, 卢孟柯, 赵志巍. 内标元素强度筛选法在激光诱导击穿光谱定量分析铝合金样品中的应用[J]. 冶金分析, 2020, 40(3): 9-15.
WANG Hua-li, ZHAO Shu-rui, LU Meng-ke, ZHAO Zhi-wei. Application of internal standard element strength-screening method in quantitative analysis of aluminum alloy samples by laser induced breakdown spectroscopy. , 2020, 40(3): 9-15.
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