Abstract：According to YS/T 257-2009, the indium content in In99995 and In9999 indium ingots is obtained by subtracting the sum of the listed Cu, Pb, Cd, Fe, Tl, Sn, As, Al and Zn impurities from 100%, while the indium content in In980 indium ingot is obtained by direct determination. There are many metallic indium products in the market with indium content in range of 98.0%-99.99%(mass fraction, similarly hereinafter). These products generally contain 12 impurity elements including Cu, Pb, Cd, Fe, Tl, Sn, As, Al, Zn, Bi, Sb and Cr. However, the analysis range of indium content in YS/T 267.9-2011 is 95.00%-99.50%, which does not cover 99.50%-99.99%. Therefore, it is necessary to establish a method for determination of the major element of indium and 12 impurity elements (including Cu, Pb, Cd, Fe, Tl, Sn, As, Al, Zn, Bi, Sb, Cr) in metal indium.The sample was dissolved with nitric acid (1+1). Tartaric acid was added for complexing with Bi, Sb and Sn to avoid hydrolysis. A method for determination of 12 impurity elements in metallic indium (98.0%-99.99%) by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. Simultaneously, the content of indium was calculated by the subtraction method. The interference test indicated that the coexisting elements in the sample had no interference with the determination. The determination range of each impurity element in the method was as below: 0.0003%-2% for Cu, Cd, Fe, Al and Cr; 0.000 5%-2% for Sb and Sn; 0.001%-2% for As, Bi, Pb, Tl and Zn. The linear correlation coefficients of the calibration curves for twelve impurity elements were all more than 0.999 5. The limits of detection for Al, As, Bi, Cd, Cu, Fe, Pb, Sb, Sn, Tl, Zn and Cr for this method were in range of 0.000 97-0.052 μg/mL, and the limits of quantification were in range of 0.003 2-0.17 μg/mL. The contents of twelve impurity elements in metal indium were determined according to the experimental method. The relative standard deviations (RSD, n=10) of determination results were not more than 3.0%. The recoveries were between 98% and 105%. The contents of indium was calculated with the subtraction method of this proposed method, and the determination results was consistent with those obtained by Na2EDTA titration method in YS/T 267.9-2011. The proposed method effectively solved the determination problem of indium content in 99.50%-99.99% metal indium products. Meanwhile, the contents of impurity elements in the sample could be also analyzed.
王劲榕, 周娅. 电感耦合等离子体原子发射光谱法测定金属铟中铟及12种杂质元素[J]. 冶金分析, 2022, 42(9): 61-67.
WANG Jinrong, ZHOU Ya. Determination of indium and twelve impurity elements in metal indium by inductively coupled plasma atomic emission spectrometry. , 2022, 42(9): 61-67.
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