New Reduction Technique for Isobaric Interferences on Ba Using ICP-Mass Spectrometry
New Reduction Technique for Isobaric Interferences on Ba Using ICP-Mass Spectrometry
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使用 ICP 质谱法减少 Ba 上同量异位干扰的新技术
DOI：
10.5702/massspec.52.171
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
T. Hirata
中科院分区：
文献类型：
--
作者：
T. Hirata
本文提出了一种用于icp -质谱仪去除Ba等压干扰的新技术。138La+、136Ce+或138Ce+等压信号对Ba的质谱干扰通过选择性产生氧化离子有效消除。在低功率运行下，ICP离子源可将La+和Ce+定量转化为氧化离子（LaO+和CeO+）。La和Ce的氧化信号的产生效率显著提高，是传统ICP功率（1.35 kW）的2亿倍。La+信号的残余信号强度与仪器背景基本一致。等压138La和138Ce对138Ba信号的总体贡献分别为0.02%和0.1%，即使La和Ce的浓度提高了10万倍。这里获得的数据表明，低功率电离产生的138La， 136Ce和138Ce信号的等压干扰水平在本研究中达到的分析精度范围内可以忽略不计（~ 1%）。值得注意的是，低功率ICP对Ba的分析灵敏度仍然是常规ICP的85%。该技术可应用于激光烧蚀取样技术，该技术要求高灵敏度，无需化学分离或纯化。
A new technique for the removal of isobaric interferences on Ba has been developed for ICP-mass spectrometer. Mass spectrometric interferences on Ba by 138La+, 136Ce+, or 138Ce+ isobaric signals were effectively eliminated by a selective production of oxide ions. The La+ and Ce+ ions could be quantitatively converted to oxide ions (LaO+ and CeO+) by the ICP ion source under the low-power operation. Production efficiency of oxide signals for La and Ce was remarkably enhanced, i.e., >2,000,000 times the level obtained by the conventional ICP power (1.35 kW). Residual signal intensity of La+ signal was almost the same level as the instrumental background. The overall contribution of isobaric 138La and 138Ce to 138Ba signals were 0.02% and 0.1%, respectively, even with the presence of × 10,000 times higher concentration of La and Ce. The data obtained here demonstrate that the level of the isobaric interferences by 138La, 136Ce, and 138Ce signals produced by the low-power ionisation was negligible within the analytical precision achieved in this study (∼1%). It should be noted that the analytical sensitivity for Ba obtained by the low-power ICP remains almost 85% of the level achieved by the conventional ICP power. This is very promising because the present technique can be applied to the laser ablation sampling technique which requires high sensitivity without chemical separation or purification procedures.