Rapid determination of chromium in vacant gelatin capsules by AAS with automatic graphite digestion
Objective To developed a method for the determination of chromium in vacant gelatin capsules by graphite furnace atomic absorption spectrometry with automated graphite digestion.Methods Put 0.500 g sample which had been blowned by high purity nitroge into a 50 ml digestion tank,added 8.00 ml nitric acid,dissolved in automatic graphite digester for 3 h.Under the operating conditions of AAS instrument,with measurement wavelength of 357.9 nm,lamp current of 25 mA,slit width of 0.7 nm and injection volume of 20 μl,chromium in samples were determined by graphite furnace AAS method.Results The regression equations showed a good linearity for chromium in the range of 1.00-30.0 μg/L,and the correlation coefficients was not less than 0.998.The limits of detection was 0.10 mg/kg.The recovery rates were 99.3％-102.2％and the relative standard deviations were 2.7％-4.8％.Conclusion The established method is simple,accurate,rapid and is applicable to the determination of chromium in vacant gelatin capsules.
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