关键词: 唐古特大黄, 矿质元素, 聚类分析, ICP-OES

Abstract: Rheum tanguticum Maxim.ex Balf.,an endemic species to Tibetan Plateau,is one of the three genuine Rhubarbs in Chinese Pharmacopoeia and has a long officinal history.In this study,mineral elements in Rh.tanguticum from fifteen different regions of Qinghai plateau were detected with ICP-OES.Seventeen elements including As,Be,Ca,Cr,Fe,Li,Mg,Mn,Ni,Pb,Sb,Se,Sr,Ti,Tl,V and Zn were detected in all the samples,while Cd,Co,Cu and Mo were detected in some samples.The highest contents of elements were Ca,Mg,Fe,Sr and Mn.Heavy metal elements including Pb,Cd and Cu were detected to be lower than the limit standard,and As was determined to be higher than the limitation in all the samples.Clustering analysis showed that there was no obvious regional distribution regularity with mineral elements.The samples can be divided into three groups,and elements concentrated differently in each of them,which may contribute to corresponding pharmacological functions.This study may be useful for the further use of Rh.tanguticum, and provide scientific data for quality control.

Key words: Rheum tanguticum, mineral elements, clustering analysis, ICP-OES