Determining Cadmium Content of Walnut by Atomic Absorption Spectrometry

The Cadmium content is determined by graphite furnace atomic absorption.It use microwave digestion technology,in nitric acid media,ammonium dihydrogen phosphate and magnesium nitrate are used as matrix modifier.Zeeman is used as background deduction to correct the cadmium content determined by graphite furnace atomic absorption spectrometry in walnuts.Cadmium shows a good linear relationship by graphite furnace atomic absorption at a rang of 1~10 ng/mL,r=0.999 4(n=5).The methods are accurate,quick and stable.