食品科学 ›› 2013, Vol. 34 ›› Issue (2): 155-158.

• 分析检测 • 上一篇    下一篇

高分辨电感耦合等离子体质谱法测定食品膨松剂中的杂质元素

聂西度1,谢华林2   

  1. 1. 湖南工学院材料与化学工程学院
    2. 长江师范学院化学化工学院
  • 收稿日期:2011-11-14 修回日期:2012-12-05 出版日期:2013-01-25 发布日期:2013-01-15
  • 通讯作者: 谢华林 E-mail:hualinxie@vip.163.com
  • 基金资助:

    基于模型集群分析技术的变量选择与模型评价新方法研究;金属组学中FI-CE-HR-ICP-MS联用体系及其生物信息学的研究

Determination of impurity elements in food leavening agents by high resolution inductively coupled plasma mass spectrometry

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  • Received:2011-11-14 Revised:2012-12-05 Online:2013-01-25 Published:2013-01-15

摘要:

建立了高分辨电感耦合等离子体质谱 ( HR-ICP-MS)法测定食品膨松剂碳酸氢钠中Be、Mg、Al、Ca、Cr、Mn、Fe、Ni、Cu、Zn、As、Cd、Hg、Pb等14种杂质元素的分析方法。样品经硝酸密闭微波溶解后,试液直接用HR-ICP-MS法同时上述痕量元素。采用低分辨模式和中分辨模式有效地消除了多原子离子对待测元素的干扰,以Ge、In、Bi为内标元素可明显改善长时间测定的稳定性和精密度水平。结果表明,各元素的检出限在0.008~21.62 μg/L之间,加标回收率在92.60%~110.00%之间,相对标准偏差(RSD)小于2.39%。

Abstract:

The determination of trace elements in food leavening agents NaHCO3 including Be, Mg, Al, Ca, Cr, Mn, Fe, Ni, Cu, Zn, As, Cd, Hg and Pb by high resolution inductively coupled plasma mass spectrometry (HR-ICP-MS) has been investigated. Samples were decomposed by HNO3 followed by dilution with ultrapure water then the above 14 elements in the solution was analyzed directly by HR-ICP-MS. To overcome some potentially problematic spectral interference, measurements were acquired in both low and medium resolution modes. The internal standards of Ge, In and Bi can significantly improve the long time stability and precision level of determination. The method was shown to be very sensitive with limits of quantification in the range of 0.008~21.62 μg/L for all investigated elements, the recovery of the samples was in the range of 92.60%~110.00% and the relative standard deviation(RSD) less than 2.39%.

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