Optimization for Determination of Cadmium in shellfishes by Wet Digestion and Graphite Furnace Atomic Absorption Spectrometry

The contents of cadmium in shellfishes were detected by wet digestion-graphite furnace atomic absorption spectrometry.Dry ashing and wet digestion,the two pre-treated methods were contrasted,and the effects of some matrix modifiers on the atomic absorption signals of cadmium in shellfish were studied,the ashing temperature and atomic temperature were optimized,the method of determination of cadmium in shellfish by using wet digestion-graphite furnace atomic absorption spectrometry was established.The results showed that: the detection limit of this method was 0.057 μg/L,RSD was 0.20%,spike recoveries were between 96.83% and 100.18%,under the condition of 0.2% Pd solution as matrix modifier with the volume of 6 μL,ashing temperature was 700 ℃,and the atomic temperature was 1100 ℃.This method could be used to determinate cadmium in shellfish.