电感耦合等离子体质谱法测定黑果枸杞中的 微量元素

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

中文关键词:  电感耦合等离子体质谱  微波消解  黑果枸杞  微量元素

英文关键词:inductively coupled plasma mass spectrometry  microwave digesion  Lycium ruthenicum Murr  trace elements

中文摘要:

      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。

英文摘要:

      Objective To establish a method for the determination of four elements (Ga, Ge, Sb, Tl)in Lycium ruthenicum Murr by inductively coupled plasma mass spectrometry (ICP-MS). Methods The elements of Ga, Ge, Sb, Tl of Lycium ruthenicum Murr were directly determined by ICP-MS after microwave digestion. Standard mixed solution were added for the standard addition experiment and the recovery rates of Ga, Ge, Sb, Tl in Lycium ruthenicum Murr before digestion were calculated. Internal standard elements of indium (In) and bismuth (Bi) were used to correct signal drifting and matrix interference. Results The detection limit of Ga, Ge, Sb, Tl in Lycium ruthenicum Murr were 0.006, 0.002, 0.003, and 0.0002 mg/kg, respectively, the recovery rates was 105.5%~118.5%, and the relative standard deviation was 0.2%~5.5%. The content of four trace elements (Ga, Ge, Sb, Tl) in Lycium ruthenicum Murr was 3~5 times higher than berry-red medlar. Conclusion The method is simple and efficient, sensitive, accurate and reliable, and it is suitable for the simultaneous determination of four trace elements of Ga, Ge, Sb, Tl in Lycium ruthenicum Murr.