气动雾化进样时微波等离子体炬作为激光发源的性能研究

以气动雾化进样研究了微波等离子体矩（ＭＰＴ）放电作原子发射光谱法激光发源的性能，包括ＭＰＴ的获得、操作参数的影响、样品引入及其分析性能，并与微波诱导等离子体进行了比较，证明了ＭＰＴ放电作激发光源有良好的分析性能。     

在线标准加入法在微波等离子体炬原子发射光谱法中的应用

在线标准加入法在微波等离子体炬原子发射光谱法中的应用叶冬梅，张寒琦，于惊雷，金钦汉（吉林大学化学系，长春，１３００２３）关键词在线标准加入法，微波等离子体炬，原子发射光谱法微波等离子体炬（ＭＰＴ）是新发展起来的激发光源［１，２］，由于它具有利于样品引...     

超声雾化进样法MPT－AFS的研究

本文对超声雾化进样微波等离子体炬（ＭＰＴ）原子荧光光谱法（ＡＦＳ）的分析性能进行了研究，在实验中详细地考察了各种实验条件和仪器参数对分析性能的影响，并利用此方法对Ｚｎ、Ｃｄ等元素进行了分析测定研究，并对这种等离子体的荧光发射区域作了探讨。     

改进的微波等离子体炬用于原子发射光谱法在线富集测定铁的测定

利用改进的微波等离子体炬（ＭＰＴ）为光源，并以活性炭为吸附剂，进行在线分离富集，研究了原子发射光谱法测定铁。实验结果表明，改进的炬管改善了ＭＰＴ的分析性能，用该分离富集了方法测定铁时消除了碱金属和碱土金属的干扰，测得铁的检出限为０．００４７ｍｇ／Ｌ。测定工业硅及自来水等实际样品中铁含量时，也得到了令人满意的结果。     

改进的微波等离子体炬用于原子发射光谱法在线富集测定铁的研究

利用改进的微波等离子体炬（ＭＰＴ）为光源，并以活性炭为吸附剂，进行在线分离富集，研究了原子发射光谱法测定铁。实验结果表明，改进的炬管改善了ＭＰＴ的分析性能。用该分离富集方法测定铁时消除了碱金属和碱土金属的干扰，测得铁的检出限为０００４７ｍｇ／Ｌ。测定工业硅及自来水等实际样品中铁含量时，也得到了令人满意的结果。     

气相色谱—微波等离子体炬原子发射光谱检测器及其响应 …

报道了一种气相谱用微波等离子体炬原子发射光谱检测器，以氩气为载气和等离子体工作气体，氧气为清洗气和屏蔽气，研究了ＭＰ－ＴＡＥＤ对有机化合物中碳元素的响应特性，探讨了氧气作为ＧＣ－ＭＰＴ－ＡＥＤ屏蔽气对碳元素检测性能的影响。     

用同轴表面波激励器和微波等离子体炬获得的微波等离子体的…

同轴表面波激励器和微波等离子体炬是两种获得微波等离子体的装置，本文比较了用这两种装置获得的ＭＷＰ作原子发射光谱法光源时的分析性能，结果表明这两种装置各有优点，但微波等离子体炬效果更好。     

微波等离子体炬发射光谱法去溶系统性能的研究

用微波等离子体矩（MPT）作激发光源，等离子体的工作气体为氩气，研究了气动雾化进样去溶系统的工作参数对分析性能的影响，探讨了水冷凝与浓硫酸吸收二者协同去溶的相关性，结果表明，OH （Q1带，带头谱线为308.520nm）的发射强度即可判别样品去溶效果。     

微波等离子体原子发射光谱法及其应用

本文评述了有关微波等离子体原子发射光谱法的一些最新进展，内容包括获得做波等离子体（ＭＷＰ）的装置，ＭＷＰ的放电特性，样品引入方法及实际应用。     

超声雾化进样法MPT—AFS的研究

本文对超声雾化进样微波等离子人体炬（ＭＰＴ）原子荧光光谱法（ＡＦＳ）的分析性能进行了研究，在实验中详细才考察了各种实验条件和仪器参数对分析性能的影响，并利用此方法对Ｚｎ，Ｃｄ等元素进行了分析测定研究，并对这种离子体的荧光发射区域作了探讨。     

用同轴表面波激励器和微波等离子体炬获得的微波等离子体的性能研究

同轴表面波激励器和微波等离子体炬是两种获得微波等离子体(MWP)的装置,本文比较了用这两种装置获得的MWP作原子发射光谱法光源时的分析性能,结果表明这两种装置各有优点,但微波等离子体炬效果更好。     

微波等离子体炬耦合方式的研究

采用气动雾化连续进样、端视观测法,考察了微波等离子体炬原子发射光谱法中等离子体Ar线的背景发射以及Al,Mg,V等元素的信号发射强度随天线耦合连接点位置的不同而发生的变化.结果表明,当天线位于炬管顶端,即天线距离活塞3λ/4和λ/4时均能获得较好的等离子体,λ/4略好,信号发射强度和信背也较大,只是精密度略差一些.初步探讨了MPT炬管的电磁场结构.     

微波等离子体光谱技术的发展(二)

微波等离子体光源是一类重要的有较强激发能力的原子发射光谱光源,主要包括微波感生等离子体光源,电容耦合微波等离子体光源及微波等离子体炬光源。本文是微波等离子体光谱技术发展的第二部分,主要介绍了电容耦合微波等离子体光源及微波等离子体炬光源的结构原理和性能。并对它们的技术特点和进展进行评述。     

Microwave plasma torch analytical atomic spectrometry

The microwave plasma torch (MPT), as a relative new source, has found extensive use in atomic spectrometry. In this review, the fundamental features and characteristics of the MPT are summarized and compared with other kinds of analytical atomic sources, such as the more popularly used inductively coupled plasma (ICP), the direct current plasma (DCP), as well as other kinds of microwave plasmas (MWPs). Since the MPT offers some attractive features, it has been used as an excitation source for atomic emission spectrometry (MPT-AES), including the atomic emission detection (AED) for gas chromatography (GC), liquid chromatography (LC) and supercritical fluid chromatography (SFC). Also, it has been used either as an ionization source for atomic mass spectrometry (MPT-AMS) or an atomization source for atomic fluorescence spectrometry (MPT-AFS). The historical development and recent improvements in these MPT atomic spectrometric techniques are evaluated with emphasis on the analytical advantages and limitations. In addition, the future research directions and the application prospects of MPT atomic spectrometry (MPT-AS) are discussed.     

Electromagnetic Properties of a New Microwave Plasma Torch with Double Resonance Configuration

In order to obtain a stable plasma and improve the performance of the torch for atomic emission spectroscopy(AES), the structure of microwave plasma torch(MPT) was analyzed. The transmission and distribution characteristics of the electromagnetic field of the torch configuration with two or three concentric tubes, as well as the metal spacer between inner and intermediate tubes with different depths were simulated with electromagnetic simulation software and verified by experiments. The results indicate that the inner tube of MPT plays an important role in strengthening the electric field intensity at the opening end of the MPT and redistributing the electromagnetic field in the whole torch by forming a double resonance configuration, and contributes to enhancing the macroscopic stability and the self-sustainment of the plasma. The stability of the plasma is proved to be excellent when the metal spacer between the inner and intermediate tubes is located at a place 20—30 mm away from the top opening of the torch. A proper location of the spacer can also avoid the formation of a static filament plasma or a rotating plasma rooted from the outer wall of the inner tube. With the help of morphological analysis, the underlying reason why MPT possesses a great tolerance to wet aerosols and air introduction was clearly made, that is, the formation region of the plasma formed with MPT is apparently separated from the reaction zone of it.     

气相色谱-微波等离子体炬原子发射光谱检测器及其响应特性的研究

报道了一种气相色谱用微波等离子体炬原子发射光谱检测器(GC-MPT-AED),以氩气为载气和等离子体工作气体,氧气为清洗气和屏蔽气,研究了MPT-AED对有机化合物中碳元素的响应特性,探讨了氧气作为GC-MPT-AED屏蔽气对碳元素检测性能的影响.     

An improved microwave plasma torch for atomic spectrometry

The analytical performance of a microwave plasma torch was improved through mechanical alterations. Several problems reported in earlier designs were addressed: the ignition and stabilization of a helium plasma in the MPT was difficult; high powers were required to both ignite and operate the plasma; otherwise, the plasma would erratically change from an annular to a filament type discharge. In the new torch, the helium discharge was stabilized by replacing the copper central tube with one made of quartz. In addition, air entrainment was alleviated through use of a sheathing gas. This modification simplified the background mass spectrum and raised the effective ionization temperature of the discharge. A detailed schematic diagram of the new microwave plasma torch is presented.     

微波辅助在线分离富集Cd的初步研究

以７１７阴离子树脂为在线分离富集的柱填充材料,用微波等离子体炬原子发射光谱法（ＭＰＴ－ＡＥＳ）测定Ｃｄ,研究了施加微波对分离富集的影响。实验结果表明,施加微波明显有利于富集和脱过程,使Ｃｄ的发射强度明显增大。     

Direct desorption/ionization of analytes by microwave plasma torch for ambient mass spectrometric analysis

Ambient ionization is the new revolution in mass spectrometry (MS). A microwave plasma produced by a microwave plasma torch (MPT) at atmospheric pressure was directly used for ambient mass spectrometric analysis. H₃O⁺ and NH₄⁺ and their water clusters from the background are formed and create protonated molecules and ammoniated molecules of the analytes. In the full‐scan mass spectra, both the quasi‐molecular ions of the analytes and their characteristic ionic fragments are obtained and provide evidence of the analyte. The successful detection of active compounds in both medicine and garlic proves that MPT has the efficient desorption/ionization capability to analyze solid samples. The obtained decay curve of nicotine in exhaled breath indicates that MPT‐MS is a useful tool for monitoring gas samples in real time. These results showed that the MPT, with the advantages of stable plasma, minimal optimization, easy, solvent‐free operation, and no pretreatment, is another potential technique for ambient MS. Copyright © 2013 John Wiley & Sons, Ltd.