高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

基于大气压下介质阻挡放电抑制LA-ICP-MS分析中元素分馏效应研究

张路远1,2, 胡圣虹1,2, 胡兆初2, 胡明月3, 郭伟1,2, 刘勇胜2   

    1. 中国地质大学(武汉)生物地质与环境地质教育部重点实验室, 武汉 430074;
    2. 中国地质大学(武汉)地质过程与矿产资源国家重点实验室, 武汉 430074;
    3. 国家地质实验测试中心, 北京 100037
  • 收稿日期:2008-05-08 修回日期:1900-01-01 出版日期:2008-10-10 发布日期:2008-10-10
  • 通讯作者: 胡圣虹

New Strategy Based on Dielectric Barrier Discharge Under Atmospheric Pressure to Inhibit Elemental Fractionation Effect in LA-ICP-MS

ZHANG Lu-Yuan1,2, HU Sheng-Hong1,2*, HU Zhao-Chu2, HU Ming-Yue3, GUO Wei1,2, LIU Yong-Sheng2   

    1. Key Laboratory of Biogeology and Environmental Geology of Ministry of Education,
    2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;
    3. National Research Center for Geoanalysis, Beijing 100037, China
  • Received:2008-05-08 Revised:1900-01-01 Online:2008-10-10 Published:2008-10-10
  • Contact: HU Sheng-Hong

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被引次数

5

摘要： 采用自制的大气压下介质阻挡放电装置串联在激光剥蚀池与ICP炬管之间, 对激光剥蚀产生的气溶胶进行预电离. 结果表明, 元素瞬时信号轮廓的平滑度得以改善, 元素分析信号精密度(RSD, n=3)可提高2.55％. 在ArF准分子激光(193 nm)和Nd∶YAG 固体激光(213 nm)两种不同波长的激光剥蚀系统中, 元素分馏因子均比常规模式下更接近于1, 表明采用介质阻挡放电对气溶胶预电离后元素分馏效应得以有效抑制. 相比两种不同波长的激光剥蚀系统, 介质阻挡放电对213 nm固体激光的元素分馏效应改善作用明显.

关键词: LA-ICP-MS, 元素分馏效应, 介质阻挡放电

Abstract: A new strategy based on a house-made dielectric barrier discharge(DBD) device to inhibit elemental fractionation effect was developed. The DBD device was connected in between laser ablation cell and ICP torch. The aerosols induced by laser ablation were preionized in the DBD and the particle sizes of aerosol were decreased. The results indicate that elemental time-resolved signals are less fluctuant in DBD mode than normal mode during the laser ablation processes. In the ArF excimer 193 nm LA-ICP-MS, the average precision of signal intensities(RSD, n=3) with DBD mode and normal mode was 1.46% and 4.01%, respectively, and the signal intensities were reduced within 15%. While the average precision and signal intensities were found no significant change in presence and in absence of the DBD device for the 213 nm LA-ICP-MS. No obvious change was obtained for the elemental fractionation index in the 193 nm laser ablation system with the DBD device. The elemental fractionation index was closer to 1 with the DBD for 213 nm LA-ICP-MS. The results demonstrate the elemental fractionation effect was inhibited availably with the DBD device.

Key words: LA-ICP-MS, Elemental fractionation effect, Dialectical barrier discharge(DBD)

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