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DETERMINATION OF TRACE STIBIUM CONTENT IN STEEL BY HYDRIDE GENERATION-ATOMIC FLUORESCENCE SPECTROMETRY

Yang Huiling1,Du Tianjun1,Tang Jing2,Han Huayun3,Zhang Xilin3 (1.General Institute for Nonferrous Metals and Explore for Mineral,Zhengzhou 450002,China;2.Institute of Antiquities and Archaeology,Zhengzhou 450000,China;3.Center of Analysis and Test,Zhengzhou University,Zhengzhou 450052,China)  
The determination of stibium in steel by hydride generation-atomic fluorescence spectrometry(HG-AFS) was developed.Interference effect of coexistent elements in steel such as Cu,V,Cr,Mn,Mo,Si,W,Ni and Ti on the determination of stibium was investigated.The influence of instrument parameters such as atomizer height,carrier gas rate,shield gas rate and concentration of HCl and KBH4 on the determination of stibium were studied and the conditions were optimized.The results showed that Kalium iodide and ascorbic acid were not only the best beforehand reducer for Sb5+,but also the occultation reagent for Fe,Cu,V,Cr,Mn,Mo,Si,W and Ti.Interference of Ni was eliminated by using EDTA-Thiourea.Under the optimized conditions,the linear range of stibium was 0-120 ng/mL,and the detection limit was 0.24 ng/mL.The relative standard deviation of determination result was 5.1%(n=10).Standard samples were determined by the method and the detection results were cosistent with the standard values.
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