Determination of silicon, aluminum, iron, vanadium and phosphorus in carbon-bearing vanadium ore by inductively coupled plasma atomic emission spectrometry
WANG Gan-zhen,TANG Xing*,YE Ming,YAN Hui,YI Xiao-ming,GUO La-mei
Geological Testing Institute of Hunan Province,Changsha 410007,China
Abstract：The samples were fused with sodium peroxide at 650 ℃ for 20 min. After acidification with hydrochloric acid, the content of silicon, aluminum, iron, vanadium and phosphorus was simultaneously determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) using Si 251.612 nm, Al 237.312 nm, Fe 259.837 nm, V 292.402 nm and P 213.618 nm as analytical lines. The determination method of silicon, aluminum, iron, vanadium and phosphorus in carbon-bearing vanadium ore was established. The results indicated that determination results of elements were not affected when the samples were directly treated by alkali fusion without carbon removal by single ignition. When the sample weight was 0.2 g, the sample could be fully fused with 2 g of sodium peroxide. However, the content of silicon should be determined within 24 h after sample treatment, or else the results would be lower. The mass fraction of each element in certain range showed linear relationship with the emission intensity. The linear correlation coefficient of calibration curve was r=0.999 9. The detection limits of elements in this method were between 18 mg/kg and 117 mg/kg. The proposed method was applied to the determination of silicon, aluminum, iron, vanadium and phosphorus in two carbon-bearing vanadium ore samples. The relative standard deviations (RSD, n=12) were between 1.0% and 5.4%. The content of silicon, aluminum, iron, vanadium and phosphorus in seven carbon-bearing vanadium ore samples according to the experimental method. The found results were consistent with those obtained by other methods.
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