共查询到20条相似文献,搜索用时 125 毫秒
1.
利用自制飞行时间质谱仪(TOFMS)比较了微秒级脉冲辉光放电(μs-pulseGD)与直流辉光放电(dc-GD)离子源的特性。讨论了两种放电模式的伏安特性以及放电参数对dc-GDTOFMS质谱信号强度的影响,给出了用dc-GD与μs-pulseGD获得的质谱图,实验结果表明,与dc-GD相比,μs-pulseGD作为TOFMS的离子源有更多的优越性,在直接固体样品分析和表面逐层分析等领域有良好的应 相似文献
2.
本文介绍一种在GS-250型气体,固体质谱计中使用的质谱数据选择软件,为完成样品的分析任务提供了便利和实用的手段。 相似文献
3.
4.
大气漂尘中多环芳烃的GC/MS研究 总被引:5,自引:0,他引:5
本文应用毛细管柱气相色谱/质谱联用技术(GC/MS)对大气漂法吉的多环芳烃分析研究。漂尘样采于玻璃纤维滤膜上,经CH2Cl2超声提取和凝胶硅胶柱二次分离后,由GC/MS测定,定性检出46种多环芳烃,并对9种主要多环芳烃定量分析。 相似文献
5.
介绍高效毛细管电泳(HPCE)与质谱法(MS)在线联用技术的三种接口,对该技术的应用情况进行了综述。 相似文献
6.
7.
二次离子质谱学(SIMS)以其很高的灵敏度、很宽的动态范围和优良的深度分辨已逐步发展成为一种重要而有特色的表面分析手段。本文结合第9届国际二次离子质谱学会议(SIMS-IX)对SIMS的最新进展作一个简要评述,范围包括SIMS的各个方面:基础研究、仪器发展、定量分析、应用以及后电离技术等。 相似文献
8.
本文报导了灰黄霉素及其在兔尿中代谢物(6-O-DMG)的EI质谱,并根据高分辨质谱(HRMS)数据讨论了它们的主要碎片裂解途径. 相似文献
9.
饮用水中四种硫代磷酸酯类化合物的质谱分析 总被引:1,自引:0,他引:1
本文用GC/MSD分析了因受辛硫磷等农药生产废水污染导致有异味的地下饮用水,并用质谱解析的方法确定了四种辛硫磷杂质,降解、代谢物等的结构 相似文献
10.
12.
13.
辉光放电质谱仪测定超纯锗中23种痕量杂质元素 总被引:5,自引:1,他引:5
本文报导了一种用辉光放电质谱仪VG9000在无标准样品的情况下对超纯半导体材料锗中23种痕量杂质元素的直接而快速的定量测定方法。该方法具有10ppt量级的检测极限,是鉴定起统金属或半导体材料纯度(8N)的理想手段。 相似文献
14.
激光烧蚀光谱(LAS)技术具有空间分辨率高,样品用量少,制样简单,分析速度快,可远程、实时、在线分析多相物质(气态、液态、固态)的特点,是近年来发展迅速的一种分析技术,具有广阔的应用前景,但它对痕量元素的分析能力不足。电感耦合等离子体质谱(ICP-MS)技术具有灵敏度高和多元素及同位素同时检测的能力,在微痕量元素精密分析方面具有很大的优势,但对基体元素分析存在困难。将LAS和ICP-MS技术相结合,形成LAS和LA-ICP-MS联用技术(LAS-ICP-MS),可充分利用两种技术的优势,形成互补技术,为地质分析提供一种便捷、可靠的分析手段:利用LAS技术,可预先监测样品的大致含量与信号的稳定性等参数,筛选适用于LA-ICP-MS分析的样品,避免因元素含量过高引起的LA-ICP-MS采样锥锥口易堵塞,基体效应过大,以及因样品均匀性差或激光参数未优化等因素影响分析的准确性和精密度等问题;利用LA-ICP-MS技术,可对激光进样条件和原子化、离子化条件分开进行优化,从而改善仪器的分析性能。将LAS-ICP-MS用于岩石矿物分析,表现出其良好的应用前景 相似文献
15.
Among the different techniques for mass analysis, ultra-high-resolution Fourier transform ion cyclotron resonance (FTICR) is the method of choice for highly complex samples, as it offers unrivaled mass accuracy and resolving power, combined with a high degree of flexibility in hybrid instruments as well as for ion activation techniques. FTICR instruments are readily embraced by the biological and biomedical research communities and applied over a wide range of applications for the analysis of biomolecules such as carbohydrates, lipids, nucleic acids, and proteins. In the field of natural organic matter (NOM) analysis, petroleum-related studies currently dominate FTICR-MS applications. Recently, however, there is a growing interest in developing high-performance MS methods for the characterization of NOM samples from natural aquatic and terrestrial environments. Here, we present an overview of FTICR-MS techniques for complex, non-petroleum NOM samples, including data analysis and novel tandem mass spectrometry (MS/MS) methods for structural classifications. © 2020 The Authors. Mass Spectrometry Reviews published by John Wiley & Sons Ltd. 相似文献
16.
17.
18.
随着仪器性能的不断提高,飞行时间二次离子质谱(TOF-SIMS)在材料表面化学分析中起着越来越重要的作用。TOF-SIMS的主要测试功能包括表面质谱、化学成像及深度剖析,本工作对TOF-SIMS的化学成像及深度剖析2种功能在生物材料和生命科学中的应用做了简单综述,重点介绍了TOF-SIMS成像技术在生物芯片制备工艺中的应用和TOF-SIMS成像和深度剖析技术对生物分子在细胞和生物体组织上空间分布的表征方法;另外,对生物样品的低温制备方法,样品表面添加基质以增强信号强度的实验手段,使用团簇一次离子源提高分子二次离子产额和利用对样品损伤小的C60离子源为轰击源做深度剖析等实验做了简单的介绍;最后,对TOF-SIMS在生物生命材料领域的应用做了展望。 相似文献
19.
László Tőkés 《Mass spectrometry reviews》2017,36(4):520-542
This reminiscing review article is an account of the author's fascination and involvements with mass spectrometry from the perspective of an organic chemist with an interest in natural product chemistry. It covers a period from 1961 through the mid 1990s as mass spectrometry evolved form a novelty technique to become a most widely used analytical technique. Following a brief synopsis of my pathway to mass spectrometry, my research efforts in this field are presented with a focus mainly on evolving principles and technologies which I had personal involvements with. To provide historical perspectives, discussions of these developments are accompanied by brief outlines of the relevant state‐of‐the‐art, shedding light on the technical and conceptual challenges encountered during those early days in mass spectrometry. Examples are presented of my involvements with basic and applied research in mass spectrometry during graduate studies at Stanford University and close to three decade tenure in pharmaceutical research at Syntex Research. My basic research interests focused mainly on principles of electron ionization induced fragmentation mechanisms, with an emphasis on steroids and other model compounds. Extensive deuterium labeling evidence was used to determine the fragmentation mechanisms of the diagnostically significant ions in the spectra of numerous model compounds, uncovering examples of wide‐ranging hydrogen transfers, skeletal rearrangements, methyl and phenyl migrations, stereoselective fragmentations and low and high energy fragmentation processes. Depiction of the industrial research phase of my career includes comments on the pivotal role mass spectrometry played on advancing modern pharmaceutical research. Examples are presented of involvements with instrumental developments and a few select cases of applied research, including studies of bile mechanisms in vertebrates, identification of bisphenol‐A leaching from sterilized polycarbonate containers, high sensitivity TCDD analyses and other projects. Reflecting on my services for the mass spectrometry society, involvements with the co‐founding and 12 year chairing of the Asilomar Conference on Mass Spectrometry and founding of the Bay Area Mass Spectrometry regional MS discussion group, as part of my services for the mass spectrometry community, are presented in some detail. © 2016 Wiley Periodicals, Inc. Mass Spec Rev 36:520–542, 2017 相似文献
20.
电感耦合等离子体质谱(ICP-MS)在非放射性金属元素分析中已经成为首选技术。近年来,随着检测灵敏度和分辨率的提高,该技术在放射性核素含量和同位素比值测定中的应用日益突出。在探讨环境放射性核素含量以及同位素比值分析意义的基础上,列举了50余篇监测实例,并展望了ICP-MS技术的发展前景。 相似文献