Content Determination of Plumbm and Cadmium in Pericarpium Trichosanthis by Graphite Furnace Atomic Absorption Spectrometry

Objective: To establish a method for determination of plumbm(Pb) and cadmium(Cd) in pericarpium trichosanthis,and the content of plumbm(Pb) and cadmium(Cd) in pericarpium trichosanthis from 5 different origins were determined.Method: Microwave digestion was used to digest the samples and graphite furnace atomic absorption spectrometry was adopted for the content determination of Pb and Cd in samples.Result: The calibration curves were linear in the range of 0.0-80.0 μg.L-1 for plumbum(r = 0.999 1);the average recovery was 94.2%(n = 5,RSD 1.4%).The calibration curves were linear in the range of 0.0-10.0 μg.L-1 for cadmium(r = 0.999 2);the average recovery was 94.0%(n = 5,RSD 1.9%).The content of Pb and Cd was 0.814 and 0.057 mg.kg-1(Anhui),0.919 and 0.114 mg.kg-1(Zhejiang),0.989 and 0.120 mg.kg-1(Hebei),0.745 and 0.042 mg.kg-1(Shandong),1.244 and 0.089 mg.kg-1(Jiangsu).Conclusion: Harmful heavy metals have been detected in pericarpium trichosanthis,which is in line with the limitation stated in the Green Trade Standard for Medicinal Plant and Preparations(Pb≤5.0 mg.kg-1,Cd ≤0.3 mg.kg-1).This method is simple,accurate and suitable for the determination of heavy metals in pericarpium trichosanthis.