Simultaneous determination of trace arsenic,antimony,selenium and tellurium in pure copper by hydride generation-four-channel non-dispersive atomic fluorescence spectrometry

After samples were dissolved by nitric acid,lanthanum hydroxide was used to co-precipitate As,Sb,Se,and Te for separation with copper substrate in ammonia medium,and As,Sb,Se,and Te in pure copper were simultaneously determined by hydride generation-four-channel non-dispersive atomic fluorescence spectrometry.Hydride generation conditions and operation parameters for simultaneous determination of four elements were optimized.The results showed that,under optimal conditions,the detection limit of As,Sb,Se and Te were 0.04,0.05,0.04 and 0.03 ng/mL respectively,and relative standard deviation(RSD,n=7) were 0.97%,0.77%,0.57 % and 1.0% respectively for 20 ng/mL As,Sb and 10 ng/mL Se,Te mixed standard solution.This method was applied to simultaneous determination of As,Sb,Se,and Te in actual samples.The determination results had no significant difference with those obtained by national standard method,and the relative standard deviation was 7.0% with recoveries of 94%-105%.