Improved performance of a shielded torch using ethanol in inductively coupled plasma–sector field mass spectrometry
Improved performance of a shielded torch using ethanol in inductively coupled plasma–sector field mass spectrometry
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在电感耦合等离子体扇形场质谱分析中使用乙醇改进屏蔽炬管的性能
DOI：
10.1016/j.sab.2015.02.001
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发表时间：
2015-04
期刊：
影响因子：
--
通讯作者：
Shenghong Hu
中科院分区：
文献类型：
--
作者：
Tao Chen;Zhaochu Hu;Shenghua Liu;Yongsheng Liu;Shan Gao;Ming Li;Keqing Zong;Haihong Chen;Shenghong Hu
为了提高微量元素分析的准确度和精密度，要求分析灵敏度高，干扰少。本文研究了在电感耦合等离子体扇形场质谱（ICP-SFMS）中加入乙醇和屏蔽炬对7 Li ~ 238 U元素信号强度、氧化物产额、双电荷离子产额、同量异位素干扰和离子分布的影响。对于本研究中研究的39个元素，使用屏蔽炬将灵敏度提高了17-58倍。使用屏蔽焊炬的众所周知的缺点是它会增加氧化物产率。在这项研究中，CeO+/Ce+的比例增加了3.3倍，在GE-上模式相比，在GE-关闭模式在正常条件下（无乙醇）。在GE-on模式中，发现在ICP-SFMS中添加4%乙醇不仅使CeO+/Ce+比率降低4倍，而且还抑制Ce 2 +/Ce+比率4.2倍。相比之下，在GE关闭模式下，2-6%乙醇对氧化物产率和双电荷比的影响最小。除了As、Se、Sb、Te和Au的信号强度在2-6%乙醇存在下增加1.4-3.7倍之外，乙醇浓度的增加抑制了其它元素的强度。在GE关闭模式下，由于乙醇浓度增加而导致的分析物信号的抑制比GE开启模式下更显著。与正常模式（无乙醇）中离子分布的空间轮廓相比，添加2-4%乙醇导致显著更宽的轴向和径向轮廓。显著更宽的轴向和径向离子分布对离子密度具有稀释效应，这随后降低了离子信号强度。加入4%的乙醇也被发现抑制干扰的2.8倍，并增加了2.1倍的相对于传统的2%（v/v）硝酸溶液中获得的值在相应的最佳操作条件下，在GE-on模式的ICP-SFMS中Te测定的灵敏度。将加入4%乙醇与GE-on模式相结合，成功地应用于一系列地质标准物质中纳克级碲的直接测定。
To improve the accuracy and precision of trace element analysis, higher analytical sensitivity and lower interference are required. In this study, we investigated the effects of the addition of ethanol in combination with a shielded torch on the signal intensities of elements from7Li to238U, oxide yields, doubly charged ion yields, isobaric interferences and ion distributions in inductively coupled plasma–sector field mass spectrometry (ICP–SFMS). For the 39 investigated elements in this study, using the shielded torch increases the sensitivity by a factor of 17–58. The well-known drawback of using a shielded torch is that it will increase the oxide yield. In this study, the CeO+/Ce+ratio is increased by a factor of 3.3 in the GE-on mode compared to that in the GE-off mode at normal conditions (without ethanol). In the GE-on mode, the addition of 4% ethanol in ICP–SFMS is found not only to decrease the CeO+/Ce+ratio by a factor of 4 but also to suppress the Ce2 +/Ce+ratio by a factor of 4.2. In large contrast, the effect of 2–6% ethanol on the oxide yield and doubly charged ratio is minimal in the GE-off mode. Except for As, Se, Sb, Te and Au, for which the signal intensities are increased by a factor of 1.4–3.7 in the presence of 2–6% ethanol, an increased concentration of ethanol suppresses intensities of other elements. In the GE-off mode, the suppression of the analyte signal due to increased ethanol concentration is more significant than that in the GE-on mode. Compared to the spatial profiles of the ion distributions in the normal mode (without ethanol), the addition of 2–4% ethanol leads to significantly wider axial and radial profiles. The significantly wider axial and radial ion distribution had a dilution effect on the ion densities, which subsequently reduced the ion signal intensities. The addition of 4% ethanol was also found to suppress the interferences of Xe by a factor of 2.8 and increase the sensitivity of Te determination in ICP–SFMS by a factor of 2.1 relative to the values obtained in conventional 2% (v/v) HNO3solution at the corresponding optimum operating conditions in the GE-on mode. The addition of 4% ethanol in combination with the GE-on mode was successfully applied to the direct determination of nanogram levels of Te in a series of geological reference materials.
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影响因子：
4.8
作者：
Wei Guo;Shenghong Hu;Yan-Xing Wang;Luyuan Zhang;Zhaochu Hu;Jiangyi Zhang
通讯作者：
Wei Guo;Shenghong Hu;Yan-Xing Wang;Luyuan Zhang;Zhaochu Hu;Jiangyi Zhang
影响因子：
3.4
作者：
G. Hall;J. Pelchat
通讯作者：
G. Hall;J. Pelchat
影响因子：
1.7
作者：
K. Park;Sun-Tae Kim;Youngman Kim;Yunje Kim;W. Lee
通讯作者：
K. Park;Sun-Tae Kim;Youngman Kim;Yunje Kim;W. Lee
影响因子：
3.4
作者：
F. Vanhaecke;R. Dams;C. Vandecasteele
通讯作者：
F. Vanhaecke;R. Dams;C. Vandecasteele
DOI：
10.1016/j.sab.2004.05.008
发表时间：
2004-07
期刊：
Spectrochimica Acta Part B: Atomic Spectroscopy
影响因子：
--
作者：
G. C. Chan;G. Hieftje
通讯作者：
G. C. Chan;G. Hieftje