Quantitative Analysis of Fe Content in Iron Ore via External Calibration in Conjunction with Internal Standardization Method Coupled with LIBS

• Published in: Chemical research in Chinese universities Vol. 31; no. 1; pp. 107 - 111
• Main Authors: Sheng, Liwen, Zhang, Tianlong, Wang, Kang, Tang, Hongsheng, Li, Hua
• Format: Journal Article
• Language: English
• Published: Heidelberg Jilin University and The Editorial Department of Chemical Research in Chinese Universities 01.02.2015; Institute of Analytical Science, College of Chemistry & Materials Science, Northwest University,Xi'an 710069, P.R.China%College of Science, Chang'an University, Xi'an 710064, P.R.China
• Subjects: Analytical Chemistry; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; CIS方法; Inorganic Chemistry; Organic Chemistry; Physical Chemistry; 定量分析; 局部热力学平衡; 标准化法; 校准曲线; 等离子体温度; 铁含量; 铁矿石; Chemical analysis; Laser-induced breakdown spectroscopy(LIBS); Iron ore; External calibration in conjunction with internal standardization(ECIS) method
• ISSN: 1005-9040; 2210-3171
• DOI: 10.1007/s40242-014-4318-1

The external calibration in conjunction with internal standardization（ECIS） coupled with laser-induced breakdown spectroscopic（LIBS） technique was proposed to perform the quantitative analysis of Fe content in iron ore The plasma temperature and the electron number density were calculated to prove that the plasma was under local thermodynamic equilibrium（LTE） conditions and to ensure that the integral intensities of Fe I lines were reasonable. In addition, the result of the quantitative analysis shows a content of （20.26±0.59）% by mass of Fe in the iron ore. It was determined by four calibration curves, drawn for four emission lines of Fe I（373.48, 373.71,404.58 and 438.35 nm） normalized by Mn I line, base on the ECIS method which can eliminate the influence of matrix effect and improve the accuracy of quantitative analysis, compared with the standard addition method. Both the results of these two analytical methods were compared with that listed in the Standard Substance Certificate. The percentage content of Fe in the same sample of iron ore by the ECIS method was （20.17±0.08）% by mass, which shows a good performance to analyze the Fe content of iron ore in combination with LIBS.