ICP-MS Determination of Hazardous Elements in Saponins of Tribulus

The samples of saponins of tribulus were digested in a closed vessel under pressure,and the contents of Cr,Mn,Ni,Cd,Ba,Cu,Zn,As,Se,Hg and Pb in the sample solution were determined by ICP-MS.Under the optimum working conditions of the instrument,values of detection limit (3σ) of As and Hg were found to be 1×10-4μg·g-1,and values of detection limit (3σ) of the remainder elements were 1×10-5μg·g-1.Values of recovery of 11 kinds of elements found were in the range of 94.4%-111.8%.The proposed method was applied to the analysis of tea standard sample (GBW 08505),the results obtained was in conformity with standard values.