电感耦合等离子体质谱法测定枸杞中16种稀土元素

建立了微波消解-电感耦合等离子质谱法(ICP-MS)测定枸杞中16种稀土元素(La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu、Y和Sc)含量的分析方法。采用微波消解对枸杞样品进行前处理,应用ICP-MS进行测定,以Rh为内标元素对定量结果进行校正。结果表明,该方法线性相关系数大于0.9999,方法检出限范围为0.009~0.821 μg/kg,定量限范围为0.030~2.736 μg/kg,加标回收率(n=6)为86.0%~108.6%,相对标准偏差(RSD)为1.25%~9.14%。选择国家标准物质胡萝卜(GSBW10047)验证方法的可靠性,待测元素测定值与标准值基本一致。该方法具有简单、快速、灵敏、准确、线性范围宽等特点。

Determination of Sixteen Rare Elements in Lycium barbarum L.by Microwave Digestion Inductively Coupled Plasma Mass Spectrometry

To establish a method for the determination of sixteen rare elements(La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Y and Sc)in Lycium barbarum L.,microwave digestion was used for pretreatment and ICP-MS for determination.Rh was used as internal standard to correct the quantitative results.The results showed that the linear correlation was more than 0.9999,the detection limit was between 0.009~0.821μg/kg,and the limit of quantitation was between 0.030~2.736μg/kg.The recovery(n=6)was ranged from 86.0%to 108.6%and the relative standard deviation ranged 1.25%~9.14%.The national standard substance carrot(GSBW10047)was selected to verify the reliability of the method.The measured values of the rare elements were basically within the allowable range of the standard values.The method was simple,rapid,sensitive,wide linear range.