Development of lithium attachment mass spectrometry - knudsen effusion and chemical ionisation mass spectrometry (KEMS, CIMS).

Development of lithium attachment mass spectrometry - knudsen effusion and chemical ionisation mass spectrometry (KEMS, CIMS).
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开发锂附着质谱 - 克努森渗流和化学电离质谱(KEMS、CIMS)。

DOI:
10.1039/c7an01161j
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发表时间:
2017
期刊:
The Analyst
影响因子:
--
通讯作者:
Booth AM
Booth AM
中科院分区:
--
文献类型:
--
作者:
Booth AM

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锂离子附着质谱提供了一种非特异性、非碎片化、灵敏且稳健的方法来检测气相中的挥发性物质。介绍了两种不同质谱系统的锂基离子附着电离源的设计、制造和结果。在本研究中,使用改良的化学电离质谱仪 (CIMS) 进行痕量气体分析,并使用改良的努森流出质谱仪 (KEMS) 进行蒸气压测量。在 Li+ CIMS 中,Li+ 电离充当软且非选择性电离源,实现了甲酸 0.2 ppt、硝酸 15 ppt 和氨 120 ppt 的检测限,允许在大气相关浓度下对此类物质进行环境测量。在超高真空 (UHV) 中锂离子附着的首次应用中,使用改编的 KEMS 测量了各种大气相关物质的蒸气压,给出的测量值相当于之前电子碰撞 KEMS 的结果。在 Li+ KEMS 中,可以测量 <10−3 mbar 的蒸气压,而不会产生任何碎片,正如设置初始电子碰撞 (EI) 所见,从而可以确定混合物中各个组分的蒸气压。
Lithium ion attachment mass spectrometry provides a non-specific, non-fragmenting, sensitive and robust method for the detection of volatile species in the gas phase. The design, manufacture and results of lithium based ion attachment ionisation sources for two different mass spectrometry systems are presented. In this study trace gas analysis is investigated using a modified Chemical Ionization Mass Spectrometer (CIMS) and vapour pressure measurements are made using a modified Knudsen Effusion Mass Spectrometer (KEMS). In the Li+ CIMS, where the Li+ ionization acts a soft and unselective ionization source, limits of detection of 0.2 ppt for formic acid, 15 ppt for nitric acid and 120 ppt for ammonia were achieved, allowing for ambient measurements of such species at atmospherically relevant concentrations. In the first application of Lithium ion attachment in ultra-high vacuum (UHV), vapor pressures of various atmospherically relevant species were measured with the adapted KEMS, giving measured values equivalent to previous results from electron impact KEMS. In the Li+ KEMS vapour pressures <10−3 mbar can be measured without any fragmentation, as is seen with the initial electron impact (EI) set up, allowing the vapor pressure of individual components within mixtures to be determined.
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