Determination of eight elements in nodular cast iron by inductively coupled plasma atomic emission spectrometry
WANG Shu-ying1 ,WANG Shuang1,XU Ping1,SUN Bo1ZHOU Yuan-ming1,BAI Shan*1,2
1. National Quality Supervison and Inspection Center for Photovoltaic Material,Jinzhou Institute of Product Quality Supervison and Inspection,Jinzhou 121000,China; 2. School of Chemical Biology & Biotechnology,Peking University,Shenzhen 518055,China
Abstract：In order to optimize the sample preparation of nodular cast iron, the dissolution with different acids was focused on and discussed. The optimum type and volume of mixed acid for sample dissolution were listed as follows: 15 mL of HCl, 5 mL of HNO3 and 5 mL of HClO4. The sample contained insoluble carbides which were dissolved by adding HClO4. The solution was heated until HClO4 fume appeared for 3-5 min. After cooling, 10 mL of H2O and 5 mL of HCl were added followed by shaking up. Then 5 mL of HNO3 was added to dissolve the salts to prepare the testing solution. The simultaneous determination method of eight elements (including Mn, Cu, Mg, Co, V, Ti, Ni and Cr) in nodular cast iron by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. The HCl-HNO3 mixture (1∶1, V/V) was added to control the acidity of testing solution at 10% (V/V). The matrix effect was eliminated by matrix matching method. In addition, the proper spectral lines were selected to effectively eliminate the interference among testing elements. The proposed method was applied for the analysis of nodular cast iron CRMs, and the found results were consistent with the certified values. The relative standard deviations (RSD, n=6) were all less than 3%. The actual sample of nodular cast iron was also determined according to the experimental method, and the analysis results were basically consistent with those obtained by national standard method (GB/T 223 series).
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