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Improvement of Sentivity and Speed of the Determination of Trace Elements by High Power Microwave Induced Plasma Atomic Emission Spectrometry

高功率微波诱导等离子体原子发射光谱法测定微量元素灵敏度和速度的提高

基本信息

批准号：
13650872
负责人：
NAKAHARA Taketoshi
金额：
$ 2.3万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

This project has been performed over the last three years to establish a new system of high-power micro-wave-induced plasma (MIP)-atomic emission spectrometry (AES) and to improve the sensitivity and speed of MIP-AES determination of trace elements. The results are as follows.1.In this work, a new system of high-power MIP-AES has been designed and constructed as such an instrument is not available in the marketplace. It consists of a new type of resonant cavity and a computer-controlled spectrometer system for the multi-element determination. For the improvement of response time, the electronic circuit in the computing system was replaced with a rapidly working one.2.In contrast with a common low-power MIP, this high-power nitrogen N/HP can have a great tolerance to continuous nebulization of sample solutions. Furthermore, the constructed system has been modified to combine this MIP with a hydride generation technique as a highly efficient sample introduction.3.With the use of this new … More ly constructed MIP-AES system coupled with a conventional solution nebulization, background emission spectra have been measured. As a result, some typical molecular band emissions were observed in the spectral range of 200-400 nm. In addition, analytical characteristics of this high-power nitrogen MIP were examined at many emission lines of a number of elements.4.For the sensitive determination of arsenic, antimony and selenium, their gaseous hydrides generated by the reaction with sodium tetrahydroborate were continuously conveyed into the MIP with no trouble. The hyphenated method has been successfully applied to the determination of arsenic, antimony or selenium in copper metals and steels with satisfactory results. Furthermore, the simultaneous multi-element determination system was developed and it application to steel analysis has been very successful.5.For a future prospect of this project, a newly developed high-power nitrogen MIP-AES system should be more and more examined and applied to the much wider range of practical samples. If this system can be coupled with other analytical techniques, chemical speciation might be possible and useful, for example, in environmental chemistry. In addition, this technique can be extended to a great extent by the use of a number of sample introduction methods, i.e., ultrasonic nebulization, electrothermal vaporization, slurry sample introduction, laser ablation, spark & arc sampling and glow discharge. Less

本课题旨在建立高功率微波诱导等离子体（MIP）-原子发射光谱（AES）新体系，提高MIP-AES测定痕量元素的灵敏度和快速性。主要研究结果如下：1.针对目前市场上没有的大功率MIP-AES仪器，设计并搭建了一套新的MIP-AES系统。它由一种新型的谐振腔和计算机控制的多元素光谱仪系统组成。为了提高响应时间，将计算系统中的电子电路替换为快速工作的电路。2.与普通的低功耗MIP相比，这种高功率的N2 N/HP可以对样品溶液的连续雾化有很大的耐受性。此外，所构建的系统已被修改，以将该MIP与氢化物发生技术相结合，作为高效的样品引入。 ...更多信息用自制的MIP-AES系统与常规溶液雾化联用，测量了背景发射光谱。在200-400 nm的光谱范围内观察到了一些典型的分子带发射。此外，还考察了该大功率氮分子印迹聚合物在多种元素的多条发射线上的分析特性。4.对于砷、锑和硒的灵敏测定，它们与四氢硼钠反应产生的气态杂质可以连续地输送到该分子印迹聚合物中。方法用于铜、钢中砷、锑、硒的测定，结果满意。5.展望本课题的未来前景，我们将进一步研究和开发大功率氮分子等离子体发射光谱仪，并将其应用于更广泛的实际样品中。如果这个系统可以与其他分析技术相结合，化学形态分析可能是可能的，并且在环境化学中是有用的。此外，通过使用许多样品引入方法，该技术可以在很大程度上扩展，即，超声波雾化、蒸发、浆料进样、激光烧蚀、火花和电弧取样和辉光放电。少