Determination of Trace Selenium in Feed Using Platform Graphite Furnace Atomic Absorption Spectrometry Linking Microwave Digestion

Conditions of platform graphite furnace atomic absorption spectrometry linking microwave digestion were determined by optimizing solvent and conditons of microwave digestion.The results showed that HNO3+HClO4+H2O2 was the best solvent of microwave digestion.The solvent could eliminate the effect of matrix in presence of matrix modifier Mg(NO3)2 and Pd(NO3)2.The concentration of selenium and peak area was linear correlation between 5~100 ng/mL(r=0.999 2).Detection limit was 0.53 ng/mL,and the reclaim ratio was 88.7%~106.3% with the relative standard deviation of 5.9%.The method was successfully applied to the determination of trace selenium in feeds.