长白山区野生、种植贝母和白术中微量元素的ICP-MS对比分析

用ICP-MS对长白山区野生、种植的贝母和白术中草药中Cu,Fe,Zn,Mg,Mn,Sr,Cr,Co,Se,Pb和Cd等多种微量元素进行了分析测定。比较了灰化法和微波消解法处理样品对测定结果的影响,研究表明,用HNO3-H2O2作消化液微波消解处理样品,精密度和回收率较好;在选定的实验条件下,各元素间互不干扰,可在同一样品液中进行多种元素的分别测定;贝母和白术含有丰富的Cu,Fe,Zn,Mg和Mn,野生的贝母和白术中Fe含量较种植的高;重金属元素Pb、Cd含量野生较种植的低;野生贝母和白术中都含有Co,而种植的贝母和白术中都未检出Co,RSD≤4.85%(n=7),加标回收率为96.8%~103.4%。

Determination of Trace Elements in Traditional Chinese Medicine from Changbai Mountain by ICP-MS

The effects of different digestives for the fritillaria and atractylodes were compared. Many trace elements in the planted and wild fritillaria and atractylodes were determined by ICP-MS The results show that the RSD and recovery are better if the planted and wild fritillaria and atractylodes were digested with HNO3-H2O2. Among the many elements determined from the fritillaria and atractylodes, Cu, Zn, Fe, Mg and Mn are the dominant chemicals. The content of Fe was higher in the wild fritillaria and atractylodes than that in the planted fritillaria and atractylodes, while the contents of heavy metal Pb and Cd were lower in the wild fritillaria and atractylodes than those in the planted fritillaria and atractylodes. The wild fritillaria and atractylodes contain Co, which was not determined in the planted fritillaria and atractylodes. The experimental results showed that the detection limits were lower than 0.086 ng x g(-1) with low RSD(n = 7, 4.85%) for most metal chemicals determined, and the standard recoveries (n = 7) ranged from 96.8 to 103.4%.