Determination of Cadmium in Grains by GFAAS

In this paper,a method for determination of cadmium in three grains raise in coal gangue is introduced by graphite furnace atomic absorption spectrometry(GFAAS).It is found that ammonium mitrate is more suitable for matrix modifier than ammonium dihydrogen phosphate which significantly increases the sensitivity of the method.The detection limit could reach a low level of 0.147 ng·mL-1.Under the optimum experimental conditions,the average recovery is 100.6% and the relative standard deviation is 5.5 %(n=6).The established method is simple,rapid and accurate.It is applied to the determination of cadmium in grains,and satisfactory results are achieved.