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The study of bismuth ions in drinking water at ultratrace levels by a microwave plasma torch coupled with linear ion trap mass spectrometry
Analytical Methods ( IF 3.1 ) Pub Date : 2018-02-02 00:00:00 , DOI: 10.1039/c7ay02857a
Xiaohong Xiong 1, 2, 3, 4 , Gangsheng Chen 4, 5, 6, 7 , Meiling Zhu 4, 5, 6, 7 , Yu Li 4, 5, 6, 7 , Chushan Yang 4, 5, 6, 7 , Kechao Xie 4, 5, 6, 7 , Zhiqiang Zhu 4, 5, 6, 7, 8
Affiliation  

A microwave plasma torch (MPT) can be used as a simple and low power-consumption ambient ion source and coupled with several kinds of mass spectrometers. When MPT mass spectrometry is applied for the detection of some metal elements, the metallic ions exhibit some novel features that are significantly different from those obtained by the traditional ICP mass spectrometry and may be helpful for the detection of metal elements in water. As a representative metal element of group VA, bismuth is of crucial importance, which is widely applied in modern industry, and has great potential impact on human health. Herein, we presented a novel study on the complex ions of bismuth in water using an MPT ion source coupled with a linear ion trap mass spectrometer (LTQ-MS). These complex ions were produced by the interaction of a plasma flame with wet aerosols first introduced through the central tube of the MPT torch and then into the inlet of the mass spectrometer; we also used another quadrupole mass spectrometer (QMS) for the comparison of different ionic patterns obtained from these two mass spectrometers. Moreover, the feature fragment patterns of these ions have been explained via a multi-step collision-induced dissociation process. Under the optimized conditions and negative working mode of LTQ-MS, the limit of detection (LOD) of bismuth in the LTQ-MS MS2 procedure was 0.028 μg L−1, which reached ultratrace levels. The linear range covers the interval of 0.5–50 μg L−1, and the relative standard deviation (RSD, n = 6) alters between 1.7% and 7.0%. The standard addition recovery rates of five brands of drinking water were between 83.74% and 113.70%. These results demonstrate that the MPT MS is a promising and hopeful tool to detect metallic ions in water, which can also be applied in many other fields such as in environmental controlling, hydrogeology, water quality inspection, and food analysis. In addition, MPT MS could be used as a supplement of ICP-MS for the rapid and on-site analysis of metal ions.

中文翻译:

微波等离子体炬结合线性离子阱质谱法研究饮用水中痕量铋离子的超痕量研究

微波等离子体炬(MPT)可以用作简单且低功耗的环境离子源,并且可以与多种质谱仪结合使用。当MPT质谱用于某些金属元素的检测时,金属离子表现出一些新颖的特征,这些特征与传统ICP质谱所获得的特征明显不同,并且可能有助于检测水中的金属元素。铋作为VA族的代表性金属元素具有至关重要的意义,铋在现代工业中得到广泛应用,对人体健康具有巨大的潜在影响。本文中,我们使用MPT离子源与线性离子阱质谱仪(LTQ-MS)结合,对水中铋的复杂离子进行了新颖的研究。这些复合离子是由等离子火焰与湿气溶胶的相互作用产生的,这些湿气溶胶首先通过MPT炬管的中心管引入,然后进入质谱仪的入口。我们还使用了另一个四极质谱仪(QMS)来比较从这两个质谱仪获得的不同离子谱。此外,已经解释了这些离子的特征片段模式通过多步碰撞诱导解离过程。在LTQ-MS的最佳条件和负向工作模式下,LTQ-MS MS 2程序中铋的检出限(LOD)为0.028μgL -1,达到了超痕量水平。线性范围涵盖0.5–50μgL -1的间隔,以及相对标准偏差(RSD,n= 6)介于1.7%和7.0%之间。五个品牌饮用水的标准添加回收率在83.74%至113.70%之间。这些结果表明,MPT MS是检测水中金属离子的有前途和希望的工具,它还可用于许多其他领域,例如环境控制,水文地质,水质检查和食品分析。此外,MPT MS可以用作ICP-MS的补充,用于金属离子的快速和现场分析。
更新日期:2018-02-02
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