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Zunyi, China

Wen J.-B.,106 Geological Party | Peng G.-P.,106 Geological Party
Yejin Fenxi/Metallurgical Analysis | Year: 2011

Totally 12 elements in lead-antimony alloy, including the major element (Sb), minor and trace elements (As, Cu, Sn, Se, Ag, Bi, Fe, Zn, Ni, Cd, Mn) were simultaneously determined by full spectrum directly reading inductively coupled plasma atomic emission spectrometer. Nitric acid was used to decompose the sample, while citric acid was added to inhibit the hydrolysis of Sb. Different sample dissolution methods and instrumental parameters were tested. Under the optimized conditions, the detection limits of elements were as follows: 0.01 μg/g for Sn, Ag and Fe; 0.02 μg/g for Mn; 0.03 μg/g for Bi and Cd; 0.04 μg/g for Sb, As and Zn; 0.05 μg/g for Se and Ni; 0.08 μg/g for Cu. The matrix lead caused background interference in the determination. However, it could be eliminated by lead sulfate precipitation. The proposed method had been applied to the determination of twelve elements described above in lead-antimony alloy, and the results were consistent with those obtained by atomic fluorescence spectrometry or atomic absorption spectrometry. The relative standard deviations (RSD, n=11) were 0.87%-3.8%, and the recoveries of standard addition were 95.2%-107.4%.

Wen J.-B.,106 Geological Party | Li K.-Q.,106 Geological Party | Xiang Z.-B.,106 Geological Party | Peng G.-P.,106 Geological Party
Yejin Fenxi/Metallurgical Analysis | Year: 2011

After the sample was decomposed by NaOH fusion, the fusant was leached with hot water, and tartaric acid was added for complexation of easily-hydrolyzed elements such as W, Mo, Nb and Ta. Then, forty components in bauxite were simultaneously determined by inductively coupled plasma atomic emission spectrometry in hydrochloric acid medium including A1 2, Fe 2O 3, SiO 2, Fe 2O 3, TiO 2, CaO, MgO, K 2O, P 2, Fe 2O 5, MnO, Ga, Ge, V, Li, Cr, Nb, Ta, Sr, Zr, Hf, Sc, La, As, B, Ba, Be, Bi, Cd, Co, Cu, Ni, Pb, Sb, Sn, Tl, Zn, Mo, Se, In, Te and W. The spectral interference was a-voided by selecting analytical lines, properly setting background deduction position and correction coefficient of interference elements. The detection limit of method was 0.05-0.85 μg/g. Forty components in national certified reference materials and actual samples of bauxite were determined by this method. The results were consistent with the certified values and those obtained by chemical method, and the relative standard deviation (RSD, n = 11) was 0.15%-5.9%.

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