Simultaneous determination of trace arsenic and antimony in titanium dioxide by microwave digestion-hydride generation-atomic fluorescence spectrometry

A determination method of trace arsenic and antimony in titanium dioxide by hydride generation-atomic fluorescence spectrometry(HG-AFS) was established.In this method,the sample was dissolved in HNO3 + HCl +HF by microwave digestion,and As and Sb were pre-reduced by L-cysteine.The effects of HCl and KBH4 solution concentration and sample reduction treatment on determination results were investigated to obtain the optimal operation conditions of HG-AFS.The results showed that there was good linearity for As and Sb in 0-25 μg/L with correlation coefficient of 0.999 9.The detection limits of As and Sb were 0.058 μg/L and 0.075 μg/L,respectively.The relative standard deviations(RSD) for 5 μg/L As and Sb were 0.71 % and 0.78%(n=11),respectively.This method has been applied to the determination of titanium dioxide samples and the results were consistent with those obtained by ICP-AES,with the recoveries of 96 %-108 %.