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

微波诱导的等离子体系统可以产生氦等离子体。氦等离子体(HE-MIP)将成为一种强大的激发源，使所有元素的测定成为可能。本项目的目的是设计和建造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(最大功率为3kW)、矩形波导、EH调谐器和腔体组成。为了产生和维持稳定的等离子体，腔和放电管的设计和建造是非常重要的。首先，利用了Beenakker设计的空穴。Butahighpower(IkW)ofmicrowavecouldnotbeintroduced到腔体，也不可能匹配阻抗。结果，我们制造了与Okwnoto制造的相同的腔体。该腔体可以在不加热的情况下产生并保持稳定的等离子体数小时。利用该腔体，为了产生并保持稳定的氦等离子体数小时，对放电管进行了预…更多的氧化铝和氧化锆管，但这些管立即被摧毁。当我们用与普通电感耦合等离子体系统相同的放电管产生氦等离子体时，等离子体相当倾向于定域在管内，等离子体与管壁接触，管子被划掉。下一步，我们准备了一管三管的放电管。用氮气作为最外层的气体，防止塑料与壁面接触，流速为10-151/min。虽然等离子体不与壁面接触，但由于产生了氦和氮的混合等离子体，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，但能够产生稳定的只由氮气组成的等离子体，并持续数小时。研究了N_2-MIP体系对生物样品中某些微量元素的连续多元素分析。实际上，要用HeMIP系统测定氟等卤素，必须制作合适的放电管，才能产生只含氦气体的等离子体。较少

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