Application of internal standard element intensity-screening in quantitative analysis of iron, titanium and strontium in soil standard sample by laser induced breakdown spectroscopy
ZHAO Shu-rui, WANG Hua-li, LU Meng-ke
Department of Physics and Electronic Engineering, Baoding University, Baoding 071000, China
Abstract：During the quantitative analysis by laser induced breakdown spectroscopy (LIBS), the problem of high detection limit and low measurement precision due to the instability of experimental conditions was always a challenge to be solved. The soil standard sample from Quality Control Station of Ministry of Geology and Mineral Resources for geochemical analysis was selected as the test sample. The Nd∶YAG laser with wavelength of 1064nm was used as the excitation light source. The pulse repetition frequency was 1Hz. The plasma spectra of soil sample in range of 420-440 nm was collected using LIBS experimental device. The data average processing based on internal standard method and internal standard element intensity-screening method (i.e., the spectral intensity of selected internal standard element was used as reference for data screening) were used for the analysis and comparison of Fe, Ti and Sr contents in test samples, respectively. The measured mass fraction of Fe, Ti and Sr by internal standard element intensity-screening method was 68.4mg/g, 10777μg/g and 75.5μg/g, respectively. The relative error was reduced to 2.01%, 0.21% and 1.95% from 10.60%, 3.20% and 8.57% by average method, respectively. The results indicated that the internal standard element intensity-screening method could reduce the data processing capacity, simplify the data handling process and improve the analysis precision. Particularly, the proposed method was suitable for the quantitative analysis of composition under experimental conditions when the laser energy output was unstable and the time delay was hardly controlled.
赵书瑞, 王华丽, 卢孟柯. 内标元素强度筛选法在激光诱导击穿光谱定量分析土壤标样中铁钛锶的应用[J]. 冶金分析, 2018, 38(7): 33-37.
ZHAO Shu-rui, WANG Hua-li, LU Meng-ke. Application of internal standard element intensity-screening in quantitative analysis of iron, titanium and strontium in soil standard sample by laser induced breakdown spectroscopy. , 2018, 38(7): 33-37.
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