Determination of 14 major and minor elements in chromite by inductively coupled plasma atomic emission spectrometry with alkali fusion
LIU Jun1,2, JIALISEN·Yimanhazi1,2
1. Xinjiang Uygur Autonomous Region Mineral Experimental Research Institute,Urumqi 830000, China; 2. Xinjiang Key Laboratory of Rock and Mineral Analysis and Technological Mineralogy,Urumqi 830000, China
Abstract：Chromite is a insoluble mineral. There are some problems in determination of chromite by inductively coupled plasma atomic emission spectrometry (ICP-AES). The chromite is difficult to decompose completely, the matrix interference is great, and it is difficult to achieve the simultaneous determination of major and minor elements including potassium and sodium in once sample fusion. The sample was melted with mixed flux of lithium tetraborate and lithium metaborate. Meanwhile, ammonium nitrate was added to oxidize ferrous oxide in chromite to protect the platinum crucible from corrosion by the reducing atmosphere and to reduce the fusion temperature. The molten matter was dissolved with acid by ultrasonic oscillation. Copper was used as an internal standard to eliminate the matrix effect of high salt produced by alkali fusion. Thus, a method for determination of 14 major and minor elements in chromite (including chromium, iron, magnesium, aluminum, manganese, titanium, nickel, cobalt, silicon, vanadium, calcium, sodium, potassium, and phosphorus) by ICP-AES was established. The linear correlation coefficients of the calibration curves for elements were all greater than 0.999 5. The limits of detection were between 0.000 3% and 0.032%. The proposed method was applied for determination of 14 major and minor elements in chromite samples, and the relative standard deviations (RSD,n=6) of determination results were all less than 10%. The contents of major and minor elements in three certified reference materials of chromite were determined according to the proposed method. The relative error (RE) of determination results could meet the allowable limit(YB) requirements of RE in DZ/T 0130.3-2006. Three chromite samples were determined according to the proposed method and the method in DZG 93-12 for chromite analysis procedure, respectively. The results were basically consistent. The simultaneous determination of 14 major and minor elements including potassium and sodium could be realized in once sample fusion.
刘军, 加丽森·依曼哈孜. 碱熔-电感耦合等离子体原子发射光谱法测定铬铁矿中14种主次量元素[J]. 冶金分析, 2023, 43(9): 41-48.
LIU Jun, JIALISEN·Yimanhazi. Determination of 14 major and minor elements in chromite by inductively coupled plasma atomic emission spectrometry with alkali fusion. , 2023, 43(9): 41-48.
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