电感耦合等离子体质谱法测定黑果枸杞中的 微量元素

目的建立电感耦合等离子体质谱法(inductively coupled plasma-mass spectrometry,ICP-MS)测定黑果枸杞中镓、锗、锡、铊等元素的分析检测方法。方法黑果枸杞样品经微波消解处理后用电感耦合等离子体质谱法直接分析,在消解之前加入标准混合溶液进行加标实验计算黑果枸杞中镓、锗、锑、铊的回收率。采用内标元素In和Bi消除信号漂移和基体干扰。结果黑果枸杞中的镓、锗、锑、铊的检出限分别为0.006、0.002、0.003、0.0002 mg/kg,加标回收率在105.5%~118.5%之间,相对标准偏差0.2%~5.5%之间。在镓、锗、锑、铊四种微量元素的含量上,黑果枸杞要明显比红枸杞高3~5倍。结论此方法操作简便高效、灵敏度高、准确可靠、适合黑果枸杞中镓、锗、锑、铊四种微量元素的同时测定。

Determination of trace elements in Lycium ruthenicum Murr by inductively coupled plasma mass spectrometry

Objective To establish and analysis method of inductively coupled plasma mass spectrometry (ICP-MS) for the determination of four heavy metals including Ga,Ge,Sb,Tl in Lycium Ruthenicum Murr. Methods In this article, the samples of Lycium Ruthenicum Murr were directly determined the elements of Ga,Ge,Sb,Tl by ICP-MS after microwave digestion. Internal standard elements of indium (In) and bismuth (Bi) were used to correct signal drifting and matrix interference. Results The method detection limit of Ga,Ge,Sb,Tl were 0.006, 0.002, 0.03, 0.003, 0.0002, and the recovery rates is 105.5% ~ 118.5%,the relative standard deviation was 0.2% ~ 5.5%. Conclusion the method is simple and efficient, high sensitivity, accurate and reliable, and it is suitable for accurate quantitative analysis of heavy metals in Lycium Ruthenicum Murr.