黔产首乌、玄参中重金属含量特征

选择贵州产块根类药材何首乌、玄参为研究对象,对其块根、茎、叶重金属含量特征进行分析,并对贵州不同产地何首乌块根、茎中重金属含量进行比较。结果表明:何首乌块根中5种重金属(Cu、Cr、Cd、As和Pb)含量均低于茎、叶中含量,玄参块根中除了Cu以外,其余重金属含量远低于茎、叶中的含量。玄参各部位Cd以及叶中Pb含量超出外经贸绿色行业标准WM/T 2—2004《药用植物及制剂》限量指标要求。何首乌、玄参不同部位对Cr、Cd的富集一致,Cr表现为叶茎块根,Cd表现为茎叶块根,玄参块根中Cd含量远大于何首乌块根中含量,说明玄参块根比何首乌块根更容易富集Cd。施秉何首乌茎中Cu、Cr、Cd、As和Pb含量均高于都匀何首乌茎中含量,块根中除了As、Pb含量低于都匀何首乌块根外,其余重金属含量高于都匀何首乌块根含量。

Characteristics of heavy metals content in traditional Chinese herbal medicines from Guizhou

Polygonum and Scrophulariaceae Herbs such as roots and tubers produced in Guizhou were studied, to analysis the concentrations of heavy metals in roots, stems and leaves, and to compare the heavy metal content in roots and stems of Polygonum collected from different production places in Guizhou. The results showed that the contents of 5 kinds of heavy mentals, such as Cu, Cr, Cd, As and Pb, in roots of Polygonum were lower than that in stems and leaves. For the roots of Scrophulariaceae, of which heavy metal content except Cu was far below that in stems and leaves. The content of Cd in the whole Scrophulariaceae and Pb in leaves were beyond the limit of the indicator of the Green Industry Standards of Medicinal Plants and Preparation of Foreign Trade (WM/T2-2004). The enrichment of Cr and Cd in different parts of Polygonum,Scrophulariaceae was the same, for Cr, leaves>stems>roots; and for Cd, stems>leaves>roots, the content of Cd in roots of Scrophulariaceae was much larger than that of Polygonum, which could prove that the roots of Scrophulariaceae were easier to enrich Cd than that of Polygonum. The contents of Cu, Cr, Cd, As and Pb in the stems of Shibin Polygonum were higher than that in the roots of Duyun Polygonum, the contents of As, Pb in roots of Shibin were lower than that of Duyun Polygonum, the remaining heavy metal contents were higher than that of Duyun Polygonum.