Study on High Power Microwave Induced Plasma Atomic Emission Spectrpmetry

本项目是在过去三年中为建立高功率微波诱导等离子体(MIP)-原子发射光谱(AES)新系统而进行的。研究结果如下：1.研究结果。在这项工作中，设计和建造了一种新的高功率MIP-AES系统，因为市场上没有这样的仪器。它由一种新型的谐振腔和用于多元素测定的计算机控制光谱仪系统组成。与普通的低功率分子印迹聚合物相比，这种高功率氮气分子印迹聚合物对样品溶液的连续雾化有很大的容忍度。此外，构建的体系已经被修改为将该分子印迹聚合物与氢化物发生技术相结合作为高效的样品引入。利用这个新构建的MIP-AES系统，结合传统的溶液雾化，测量了背景发射光谱。结果表明，由OH、NH、N_2~(2+)和NO引起的典型分子带发射为…在200-400 nm的光谱范围内观察到的更多。此外，对这种高功率N_2分子印迹聚合物在33个元素的84条发射线上的分析特性进行了检测。为了灵敏地测定砷、锑和硒，它们与四氢硼酸钠反应生成的气态氢化物被连续无故障地输送到MIP中。该方法用于海藻、铜、钢中砷、锑、硒的测定，结果令人满意。为了这个项目的未来前景，新开发的高功率N_2MIP-AES系统应该得到越来越多的检验，并应用于更广泛的实际样品。如果这一系统能与其他分析技术相结合，化学形态形成可能成为可能，并在环境化学中发挥作用。此外，通过采用超声波雾化、电热蒸发、浆料进样、激光烧蚀、火花&电弧取样和辉光放电等进样方法，可以在很大程度上推广这一技术。较少

This project has been performed over the last three years to establish a new system of high-power microwave-induced plasma (MIP)-atomic emission spectrometry (AES). 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.2. In contrast with a common low-power MIP,this high-power N_2 MIP 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 newly-constructed MIP-AES system coupled with a conventional solution nebulization, background emission spectra have been measured. As a result, some typical molecular band emissions ascribed to OH,NH,N_2^+ and NO were … More observed in the spectral range of 200-400 nm. In addition, analytical characteristics of this high-power N_2 MIP were examined at 84 emission lines of 33 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 sea weeds (to be a candidate for a standard sample issued by National Institute of Environmental Studies, Japan), copper metals and steels with satisfactory results.5. For a future prospect of this project, a newly-developed high-power N_2 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