低功率微波等离子体炬（MPT）光源基本性质的初步研究

对低功率微波等离子体炬(MPT)光源基本性质进行了初步研究,采用“双线法”测定了有、无样品引入时光源中激发温度随观测高度的变化;测定了Zn、Cd、Mg的原子线和离子线发射强度随观测高度的变化;还研究了一些实验参数对等离子体激发温度的影响。     

电热蒸发进样低功率MPT—AES测定铜,锌,镉的研究

微波等离子体炬(MPT)是一种具有类似ICP炬管结构的新型等离子体光源,该光源的基本性质已进行了详细的研究。本文采用自制的低功率MPT为激发光源,以氧为工作气体,用微型电热蒸发装置进样,测得铜、锌和镉的检出限分别为3.3、1.4和1.7ng/mL。考察了碱金属元素对铜、锌和镉发射信号的影响,该方法应用于钢样中铜的测定,结果较好。     

氧屏蔽氩微波等离子体炬的背景发射及其中某些元素发射特征的初步研究

氧屏蔽氩微波等离子体炬(OS-Ar-MPT)是对Ar-MPT新光源的一个重大改进.本文主要探讨了屏蔽气氧气流量变化时对该新光源背景发射光谱及某些元素的原子线、离子线发射的影响.结果表明,该光源简单的背景发射十分有利于作原子发射光谱分析,同时它对多数元素的原子发射线信背比都有明显的改善,是一种很有发展前途的新光源.     

一种用来可同时测定氮及其它金属元素的新型延长炬管的设计

本文介绍了一种新型延长炬管的设计。该炬管使在电感耦合等离子体原子发射光谱仪(ICP-AES）上同时测定氮及其它金属元素成为可能，并且在不同程度上改善了一些金属元素的检测限。本文利用该炬管．在ARL 3520光谱仪上同时测定了生物标准样品中的氮及Fe，Mn、Cu、Zn等四种金属元素。结果与定值吻合，相对标准偏差均小于5%。     

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。     

微波等离子体炬发射光谱法测定锌的研究

研究了用微量进样-微波等离子体炬发射光谱法(MPTAES)测定锌的方法,考察了微波功率、载气流量、酸浓度等实验参数对锌发射强度的影响。方法测定锌的检出限为1.2ng/ml。对实际样品进行的分析令人满意。     

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。     

常压高频放电等离子体炬改进制备CO2/CH4重整用Ni/MgO催化剂

比较了常规法、等离子体炬法和等离子体炬辅助焙烧法制得的Ni/MgO催化剂上CO2/CH4重整反应性能差异,并利用X射线衍射、透射电镜、X射线光电子能谱和CO2程序升温表面反应等技术对反应前后催化剂进行了表征,结果表明,采用等离子体炬辅助焙烧法制备的催化剂上Ni晶粒粒径小,分散度较高,低温活性和抗积炭性能较高;在常压,7...     

氧屏蔽氩微波等离子体炬的背景发射及其中某些元素发射？…

氧屏蔽氩微波等离子体炬（ＯＳ－Ａｒ－ＭＰＴ）是对Ａｒ－ＭＰＴ新光源的一个重大改进。本文主要探讨了屏蔽气氧流量变化时对该新光源背景发射光谱及某些元素的原子线、离子线发射的影响。结果表明,该光源简单的背景发射十分有利于作原子发射光谱分析,同时它对多数元素的原子发射线信背比都有明显的改善,是一种很有发展前途的新光源。     

微波等离子体炬原子发射光谱法测定豆制品中的金属含量

研究了用微波消解-微波等离子体炬原子发射光谱法(MPT-AES)测定豆制品中的金属含量的方法.考察了各微量元素的分析谱线波长、载气流量、工作气流量、氧屏蔽气压力和微波前向功率对Mg,Ca,Cu,Fe,Zn,Pb,Ni,Cr,Cd,Mn 10种金属元素发射谱线强度的影响,分析了酸浓度及共存离子对其测定的影响,得到了测量不同金属离子的最佳工作条件,进而得出了在最佳条件下测量10种金属离子的工作曲线、检出限、相对标准偏差(小于5%)、回收率(98.47%~101.47%)等,并通过加标回收实验验证了方法的准确性.     

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．     

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。     

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。     

Study of Spectral Character of Alkali Metals Using Microwave Plasma Torch Simultaneous Spectrometer

IntroductionIn the past decades, alkali metals were widely ap-plied in many fields, such as applied catalysis[1,2],surface science[3,4], and molecular biology[5]. Micro-wave plasma torch(MPT), developed and improved byYu and coworkers[6,7], is a novel dev…     

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.     

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.     

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.     

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

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