Ultrasensitive detection of volatile aldehydes with chemi-ionization-coupled time-of-flight mass spectrometry

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	Ultrasensitive detection of volatile aldehydes with chemi-ionization-coupled time-of-flight mass spectrometry
	Yang, Bo ; Xu, Ce ; Shu, Jinian ; Li, Zhen ; Zhang, Haixu ; Ma, Pengkun
刊名	TALANTA
	2019-03-01
卷号	194 页码:888-894
关键词	Chemi-ionization Mass spectrometry Aldehydes On-line detection Photoionization
ISSN号	0039-9140
英文摘要	The chemi-ionization reaction is a high-efficiency pathway to produce molecular ions in plasma, however, it has rarely been applied in mass spectrometry to directly produce analyte ions. In this study, a novel chemi-ionization technique for mass spectrometry was applied for the direct and ultrasensitive detection of gaseous aldehydes. The ionization technique was enacted by a recently observed chemi-ionization reaction: the efficient proton transfer from H2O to oxygenated compounds was stimulated by vacuum ultraviolet (VUV)-excited CH2Cl2. By analyzing a series of aliphatic aldehydes (C2-C5) and benzaldehyde with different proton affinities (PAs) and polarities, the ionization features of the new ionization method were investigated for the first time. The chemi-ionization of aldehydes presented soft ionization characteristics with fragmentation patterns analogous to that of VUV photoionization. The method showed ultrahigh sensitivities toward aldehydes (up to 1108 +/- 6 counts pptv(-1) for benzaldehyde in 10 s acquisition time). The corresponding 3 sigma limits of detection (LODs) achieved 0.30-0.69 pptv, which are equivalent of 1.35-1.92 ng m(-3), for the compounds investigated. The humidity experiments revealed that the moisture in the sample gas had an evident impact on the detection efficiency of the analyte and the influence was PA dependent. In addition, the applicability of this ionization mode was further tested by analysis of aldehydes in cigarette smoke. This study provides a promising ionization method for greatly improving the current on-line detection sensitivity of volatile aldehydes.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43287]
专题	生态环境研究中心_水污染控制实验室
作者单位	1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China 2.Univ Chinese Acad Sci, Natl Engn Lab VOCs Pollut Control Mat & Technol, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Yang, Bo,Xu, Ce,Shu, Jinian,et al. Ultrasensitive detection of volatile aldehydes with chemi-ionization-coupled time-of-flight mass spectrometry[J]. TALANTA,2019,194:888-894.
APA	Yang, Bo,Xu, Ce,Shu, Jinian,Li, Zhen,Zhang, Haixu,&Ma, Pengkun.(2019).Ultrasensitive detection of volatile aldehydes with chemi-ionization-coupled time-of-flight mass spectrometry.TALANTA,194,888-894.
MLA	Yang, Bo,et al."Ultrasensitive detection of volatile aldehydes with chemi-ionization-coupled time-of-flight mass spectrometry".TALANTA 194(2019):888-894.