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。     

调控微波等离子体能量进行药片活性分子结构的质谱分析

采用微波等离子体质谱(MPT-MS)技术,对替硝唑和马来酸氯苯那敏药片进行快速质谱分析.通过调控等离子体能量,在一级谱图中可得到目标物的准分子离子及丰富的碎片离子,这些碎片离子与其对应串联质谱数据基本一致,甚至更加丰富;结合标准品比对分析,最终确定这些碎片离子来自目标物而非基质.因此,MPT兼具硬电离和软电离性质,采用MPT-MS技术从一级质谱图中获得的数据可对药片中活性分子的结构进行鉴定.该方法具有快速、准确及环保等特点,在发展MPT与简单的质量分析器联用,实现质谱仪的小型化等方面有广阔的应用前景.     

气动雾化进样时微波等离子体炬作为激发光源的性能研究

以气动雾化进样研究了微波等离子体炬（ＭＰＴ）放电作原子发射光谱法激发光源的性能，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ＭＰＴ放电作激发光源有良好的分析性能．     

Development of a miniature simultaneous MPT spectrometer

An unique miniature simultaneous microwave plasma torch (MPT) atomic emission spectrometer employing linear UV intensified charge-coupled device (ICCD) array detector has been developed and studied preliminarily. The detection limits and precisions of the spectrometer for Ag, Al, Ba, Ca, Cr, Cu, Fe, Mg, Mn, Sr and V by using different CCD exposure times have been determined. An analysis of a practical sample has been carried out. The preliminary results demonstrate that such simultaneous spectrometer has advantages of saving sample and time, especially suitable for use as detector for chromatography and in combination with flow injection systems. Taking analytical figures of merit and portability into accounts, the miniature simultaneous MPT system will have extended application areas and greater competition potential as compared with commercialized scanning MPT spectrometers.     

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。     

Determination of Cd,Pb and Sr by Microwave Plasma Torch Atomic Emision Spectrometry Using an Electrothermal Vaporization Sample Introduction System

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MPT-AES测定奶粉中的Ca和Fe

用微波等离子体(MPT)为激发光源,氩气为等离子体工作气体,用气动雾化进样,采用标准曲线法研究了微波等离子体炬原子发射光谱法(MPT-AES)测定奶粉中Ca、Fe的方法。详细考察了溶液中HCl浓度、HNO3浓度、微波前向功率、载气流量、工作气流量等实验参数对测定的影响,同时考察了共存元素钠、镁、锌对钙和铁发射强度的影响。     

Evaluation of Microwave Plasma Torch (MPT) as an Excitation Source for Determination of Mercury

The microwave plasma atomic spectrometry is an important branch of the plasma atomic spectrometry. Since the first use of microwave induced plasma(MIP) as an excitation source for spectral Chemical analysis by Broida and Chapmanin in 1958, especially the introduction of TM_(010) cavity by Beenakker in 1976 and of surfatron by Moisan in 1979 with which an atmospheric pressure helium MIP could be obtained, MIP has received considerable attention as a new excitation source for spectrometric analysis. However, since MIP suffers from the in ability to analyse the aqueous sam-     

气相色谱-微波等离子体炬双检测器及其气相色谱的响应特性

提出并建立了气相色谱-微波等离子体炬(MPT)原子发射光谱和离子化双检测器系统. 以Ar气作为等离子体工作气体, O2气作为等离子体屏蔽气体, 同时获得了被测组分的原子发射和离子化信息, 并对不同种类有机化合物的相对响应系数及检出限进行了测定.     

气相色谱用氩微波等离子体炬发射光谱检测器——对Sn,P,Si和B金属有机化合物响应特性的研究

报道了一种气相色谱用氩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、等离子体工作气和尾吹气,探讨了不同气体作等离子体清洗气和屏蔽气时对Sn,P,Si,B等元素响应特性的影响.研究了系统对Sn,P,Si,B等元素的检出限、线性范围和精密度,并对乐果乳油中磷元素的含量进行了测定.     

低功率微波等离子体炬原子发射光谱法的研究——超声雾化进样测定金、银、铂、铑、钯

本文提出一种测定贵金属元素的微波等离子体炬原子发射光谱法(MPTAES)。采用自制的超声雾化微量进样装置进样,以氩气为工作气体,探讨了观察高度,微波功率、体系介质、氩气流量和共存元素对被测元素发射信号的影响。选用合适的分析线和MPT光源的工作参数,其方法的检出限分别为5.8(Au)、0.5(Ag)、12(Pt)、1.6(Rh)和t 1.0ng/ml(Pd)。实际样品中金和银的测定结果是令人满意的。     

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.     

Determination of arsenic and antimony by microwave plasma atomic emission spectrometry coupled with hydride generation and a PTFE membrane separator

The performance of a microwave plasma torch (MPT) discharge atomic emission spectrometry (AES) system directly coupled with hydride generation (HG) for the determination of As and Sb has been studied. The argon MPT system can sustain a stable plasma over a wide range of carrier and support gas flow rates with optimum performance at 250 and 1450 ml min⁻¹, respectively. The presence of trace amount of water in the MPT discharge is found to affect the detection limits and the signal to noise ratio. A PTFE membrane separator is applied for hydride introduction and water rejection. In addition, the membrane cell separator also improves the signal to noise ratio by serving as a pressure buffer to minimize noise due to pressure fluctuation. Detection limits (3σ) of 8.1 and 3.2 ng ml⁻¹ are obtained with the analytical lines As I 228.812 nm and Sb I 259.809 nm, respectively at an MPT power of 135 W. The detection limits are improved when a concentrated sulfuric acid cell is placed after the membrane cell to further remove water. This double cell system yields detection limits of 5.3 and 2.1 ng ml⁻¹ for As and Sb, respectively under the same operating conditions. Linear dynamic ranges of three orders of magnitude could be obtained.     

微波等离子体炬光源基本特性的研究

用计算机化断层扫描成象技术研究了微波等离子体炬(MPT)放电的发射轮廓,证明该光源具有良好的对称性,并有一个有利于样品引入的中央通道,最佳分析区在炬管上方5～10 mm,用激光Thomson散射和Rayleigh散射技术测定了ArMPT和HeMPT放电的电子温度、电子密度和气体温度,证明MPT放电的电子温度很高而气体温度较低,是一种非热光源。其中的高能电子处于过布居状态,具有很高的激发能力。     

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.     

气动雾化进样微波等离子体炬（MPT）原子荧光光谱法测定锌的研究

本文将水溶液雾化进样与微波等离子体炬原子荧光光谱法联用,建立了HCL-MPT-AFS测定Zn的新方法。讨论了实验条件的选择问题以及溶液中共存离子对测定Zn的影响,本文所推荐的方法具有较高的灵敏度和精密度,并将其用于实际样品分析。     

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。     

Microwave plasma torch mass spectrometry for some rare earth elements

Rare earth elements (REEs) have been widely applied in modern industry and material science due to their special chemical properties and luminescence properties, but their environment pollution problem has also attracted attention. How to trace and control impact of REEs on environment and develop highly sensitive methods for REEs analysis have practical significance. Microwave plasma torch (MPT) is a kind of simple, low power consumption (～200 W) and easily operated plasma generators. When it was coupled with varied mass spectrometers as ion source of mass spectrometry (MS), i.e. MPT-MS can use for the analysis of metal elements in aqueous with the remarkable advantage of only minimal or even no simple pretreatment, and can meet comprehensive requirements of environmental control and water quality monitoring. MPT-MS have also an ability to carry out online real-time monitoring and analysis of water environment. Compared with the traditional ICP-MS, it can obtain more effective information and has higher sensitivity (the detection limit is at sub-ppb level). This paper reviews common methods and research progress of REEs analysis in recent years. Practical applications and advantages of MPT in the analysis of REEs are briefly summarized. Specifically, this paper introduces some work recently done in our group on analysis of REEs by the MPT, including analysis of metal elements distribution in water samples in local Poyang Lake, and general rules of formation and behavior of complex metal ions in the MPT plasma are also proposed afterwards. Through the practically dealing with the Poyang Lake case by the MPT, hopefully this would interest more academia into this area so as to speed up development of the MPT itself.     

微波等离子体原子发射光谱法测定葡萄酒中的7种微量元素

利用510型微波等离子炬原子发射光谱仪对葡萄酒中铅、镁、铝、铜、锰、铁和锌7种金属元素进行了测定,考察了载气流量、工作气流量、酸度对7种金属元素发射强度的影响.在选定的最佳测试条件下,利用工作曲线法测定了红葡萄酒样品中的金属离子含量.该方法测定结果的相对标准偏差为1. 08%～5. 55%(n=4),加标回收率为93. 6%～105. 3%.