Determination of chromium in soft capsules shells of drug and health food by microwave digestion-furnace atom absorption spectrometry

Objective To establish a method of microwave digestion-furnace atom absorption spectrometry for the determination of chromium in soft capsule shells of drug and health food.Methods The determination conditions of microwave digestion-furnace atom absorbance spectrometry were optimized.The content of chromium was determined under the wavelength of 357.9nm,with the slit width 0.7nm.Results The calibration curve was linear in the range of 0-50μg·L-1(r=0.998 9),the limit of detection was 0.02mg·kg-1,and the limit of quantification was 0.08mg·kg-1.The average recoveries at three levels were 101.4%,100.8% and 99.7%,respectively,and the RSD were 1.9%,2.1%and 3.2%,respectively.Conclusion This method is simple,accurate,and suitable for the determination of chromium in soft capsule shells of drug and health food.