Determination study of heavy metal in 5 traditional Chinese drugs

Objective:To determine the content of heavy metal in traditional Chinese drugs and to study the application of UV spectrophotometry in this area.Methods:UV spectrophotometry was established to determine the content of heavy metals in 5 kinds of Chinese drugs such as Radis platycodonis.Results:The linear range of heavy metal was 0-50ug.ml-1(r=0.9993),and the average recovery rate was 98.46,RSD=1.49%(n=6).The contents of heavy metals in Radis platycodonis,Radis salviae miltiorhizae,Radis codonopsis were 25.60,27.12,24.44 ug.g-1 respectively,and the contents of Rhizoma chuanxiong and Pheretima were on the high side(47.38 and 50.56 ug.g-1 respectively).Conclusion:The UV spectrophotometry can be used for the determination of heavy metals in traditional Chinese drugs.