混合熔剂熔融ICP-OES内标法同时测定铝土矿中铝等十种元素

doi:10.3964/j.issn.1000-0593(2025)12-3387-07

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Abstract Bauxite is one of the strategic minerals in China. Accurate and efficient analysis of the contents of major, associated beneficial, and harmful elements is of great significance for evaluating and comprehensively utilizing bauxite. At present, the systematic analysis of bauxite is still dominated by traditional chemical methods and atomic absorption spectrometry, with relatively low analytical efficiency. It is necessary to develop a simple, efficient, and simultaneous multi-element analysis method for bauxite. The key points of simultaneously determining the multi-element content in bauxite by inductively coupled plasma optical emission spectrometry (ICP-OES) include selecting efficient decomposition methods for refractory bauxite samples, improving the precision and accuracy of determination under high dilution conditions, and eliminating matrix and coexisting element interferences. This study proposes a method for 10 elements (Al, Si, Fe, Ti, Sr, Li, Cr, V, Zr, Sc) in bauxite using mixed-flux fusion-ICP-OES with an offline internal standard. The effects of mixed flux dosage and melting temperature on sample decomposition efficiency were systematically investigated. 0.1 g sample was added to 0.7 g mixed flux and melted at 1 000 ℃ for 20 min to ensure complete decomposition of the sample; the extraction conditions of the fused samples were optimized. Ultrasonic extraction with 15% hydrochloric acid was selected, as it offers high extraction efficiency without silicic acid precipitation. Based on the content of various elements in bauxite, the sensitivity and interference of spectral lines, the analytical spectral lines of the determined elements were selected. By comparing the correction effects of Cd 214.438 nm, Cd 228.802 nm, Co 228.616 nm, and Co 345.351 nm on the 10 elements, Co 228.616 nm and Co 345.351 nm were selected as internal standard lines to correct different elements, respectively, which significantly improved the precision of the determined elements. The interference of aluminum at different concentrations on other elements was systematically investigated, and it was found that the degree of interference varied among elements. The concentration of aluminum in the sample solution (dilution of 2 500 times) was generally not more than 200 μg·mL^-1, and the interference on other elements could be ignored. The detection limit for each element in this method ranged from 0.5 μg·g^-1 to 0.1%. According to the verification of certified reference materials, the relative standard deviation (RSD, n= 12) of all elements except lithium was less than 5%. The relative error (RE) of major elements (Al₂O₃, SiO₂, Fe₂O₃, TiO₂) ranged from -1.81% to 1.61% (e. g., Al₂O₃: -0.65%~0.28%), while the relative error of other elements ranged from -10.53% to 12.78%. The determination values were basically consistent with the certified values. This method is convenient and fast, with a low detection limit, high accuracy, and good precision, and is suitable for the simultaneous analysis of multiple elements in bauxite with different contents.

Key words：Inductively coupled plasma optical emission spectrometry; Bauxite; Simultaneous multi-element analysis; Mixed flux fusion; Internal standard method

Received: 2025-05-07 Accepted: 2025-09-24

ZTFLH:

O657.3

Corresponding Authors: YANG Guo-yun, BAI Jin-feng E-mail: 731757094@qq.com；bjinfeng@mail.cgs.gov.cn

Cite this article:

ZHANG Ling-huo,YANG Guo-yun,MA Na, et al. Simultaneous Determination of Ten Elements Including Aluminum in Bauxite by Mixed Flux Fusion-ICP-OES With Internal Standard Method[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2025, 45(12): 3387-3393.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2025)12-3387-07 OR https://www.gpxygpfx.com/EN/Y2025/V45/I12/3387

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