Determination of arsenic in titanium dioxide by hydride generation atomic fluorescence spectrometry
WANG Yong,WANG Wei,LIU Yuan-qing,LIU Lin,GONG Hou-liang
National Quality Supervision and Testing Center of Vanadium and Titanium Products,Product Quality Supervision and Testing Institute of Panzhihua, Panzhihua 617000,China
Abstract：For the detection of arsenic in titanium dioxide, the sample was usually dissolved with nitric acid-hydrochloric acid-hydrofluoric acid system. However, this pretreatment method had the following problems: the titanium was easily hydrolyzed; the digestion time was relatively long. In the experiment, the dissolution method of titanium dioxide sample with sulfuric acid-ammonium sulfate system was proposed. The problems above were solved. Moreover, the reaction was mild. Accordingly, the determination method of arsenic in titanium dioxide by hydride generation atomic fluorescence spectroscopy (HG-AFS) was established. The results showed that the mass concentration of arsenic in range of 0.50-20 μg/L had good linear relationship with the corresponding absorbance. The linear correlation coefficient was 0.999 8. The detection limit of method was 0.05 μg/L. The interference test results indicated that the coexisting elements in matrix titanium sample did not interfere with the determination. The proposed method was applied to the analysis of actual sample, and the found results were consistent with those obtained by inductively coupled plasma mass spectrometry (ICP-MS). The relative standard deviation (RSD, n=11) was less than 5%. The recoveries of standard addition were between 95% and 101%.
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