Speciation Analysis of Astragalus Membranaceus for Its Trace Elements

Contents of 4 trace elements,i.e.,iron,manganese,copper and zinc in different species present in the traditional Chinese medicine (TCM),astragalus membranaceus grown in various areas in China,were studied and reported.Methods for separation of the species and preparation of the respective test solutions,including the test solution for determination of total amount of the 4 elements,test solutions of soluble species and suspension species in the water extract of the TCM,test solutions of organic,inorganic,stable and unstable species separated from the test solution of the soluble species,and test solution for determination of the 4 elements in the insoluble residue from water extraction,were described in detail.Method of ICP-AES was used for the determination of the 4 elements in 8 portions of test solutions mentioned above.Test for recovery was made by standard addition method using the test solution of soluble species as matrix,values of recovery found were ranged from 97.6%-102.0%.