Trial Design and Construction of High Power Microwave - Induced Plasma Atomic Emission Spectrometry System

高功率微波诱导等离子体原子发射光谱系统的试设计与搭建

• 批准号: 02557028
• 负责人: TSUNODA Humio
• 金额: $ 6.72万
• 依托单位: Iwate Medical University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02557028/
• 关键词: He-MIP; N_2-MIP; Atomic emission spectrometry; Trace element; Sequential multielement analysis; Biological materials; He-MIP; N_2-MIP; MIP

A microwave-induced plasma system can produce a helium plasma. The helium plasma(HE-MIP)will become a powerful source of excitation, enabling the determination of all elements. The aim of this project was the design and construction of the system of HE-MIP atomic emission spectrometry and the study of the application.The system was constructed from a microwave generator(3kW maximum power), rectangular waveguides, a EH tuner and a cavity. To produce and sustain a stable plasma, the design and construction of a cavity and a discharge tube were very important. First, thecavitydesignedbyBeenakkerwasutilized. Butahighpower(IkW)ofmicrowavecouldnotbeintroduced to the cavity and it was also impossible to match the impedance. Iii tlie result, we manufactured tlie same cavity as Okwnoto manufactured. This cavity can produce and sustain a stable plasma for several hours without heating.With this cavity, to produce and sustain a stable helium plasma for several hours, tlie discharge tubes were pre … More pared alumina and zirconium oxide tubes, but these tubes were immediately destroyed. When we produce a helium plasma with the same discharge tube as that used in tlie ordinary ICP system, the plasma considerably tended to localize in the tube, and the plasma was in contact with the wall of the tube and the tube was nielted. Next, we prepared the discharge tube with three tubes in a tube. Nitrogen was used as a most outer gas to prevent the plasi-na froin being in contact with the wall and the flow rate was 10 - 151/min. Though the plasma was not contact with tlie wall, as the plasma mixed with helium and nitrogen was produced, the atomic emission of fluorine was not observed.While it was impossible to prepare He-MIP system for the determination of all elements, the stable plasma consisted of only nitrogen gas was able to be produced and sustained for several hours. Sequential multielement analysis of some trace elements in biological materials with the N2-MIP system was studied. In feature, to determine halogen such as fluorine by HeMIP system, the plasma consisted of only helium gas must be produced by making the suitable discharge tube. Less

微波诱导等离子体系统可以产生氦等离子体。氦等离子体（HE-MIP）将成为一个强大的激发源，使所有元素的测定。本课题的主要目的是设计和构建HE-MIP原子发射光谱系统并进行应用研究，该系统由微波发生器（最大功率3 kW）、矩形波导、EH调谐器和谐振腔组成。为了产生和维持稳定的等离子体，腔体和放电管的设计和构造是非常重要的。首先，利用Beenakker设计的空腔。但高功率微波（1 kW）不能引入腔体，阻抗匹配也是不可能的。结果，我们制造了与Okwnoto制造的相同的腔。这种腔体可以在不加热的情况下产生并维持数小时的稳定等离子体，为了产生并维持数小时的稳定氦等离子体，我们研制了几种放电管， ...更多信息 氧化铝和氧化锆管，但这些管立即销毁。当我们用与普通ICP系统相同的放电管产生氦等离子体时，等离子体明显倾向于在管中局域化，等离子体与管壁接触，管被熔化。接下来，我们准备了一个管中有三个管的放电管。用氮气作最外层气体，防止等离子体与管壁接触，流速为10 - 151/min，虽然等离子体不与管壁接触，但由于产生了氦氮混合等离子体，所以没有观察到氟的原子发射，虽然不可能制备出测定所有元素的He-MIP体系，但由于等离子体中存在大量的氦氮混合等离子体，因此不能测定氟的原子发射。能够产生仅由氮气组成的稳定等离子体并维持数小时。研究了用N2-MIP系统对生物样品中微量元素的多元素连续分析。用HeMIP系统测定氟等卤素离子体的特点是，必须制作合适的放电管，产生只有氦气组成的等离子体。少