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An ultrasensitive SPI/PAI ion source based on a high-flux VUV lamp and its applications for the online mass spectrometric detection of sub-pptv sulfur ethers
Guo, Yedong; Wang, Haijie; Yang, Bo; Shu, Jinian; Jiang, Kui; Yu, Zhangqi; Zhang, Zuojian; Li, Zhen; Huang, Jingyun; Wei, Zhiyang
2022-09-01
Source PublicationTALANTA
ISSN0039-9140
Volume247Issue:0Pages:123558
AbstractSingle-photon ionization mass spectrometry (SPI-MS) is an attractive analytical technique for the online detection of volatile organic compounds; however, the low photon flux of the vacuum ultraviolet (VUV) lamp commonly used in the SPI ion source and the corresponding low detection sensitivity remain a constraint to its wide field applications. In this study, a new VUV lamp-based SPI ion source was developed. By increasing the discharging volume and optimizing the configuration of the lens and ionizer, the photon flux of the VUV lamp and the sensitivity of the ion source were significantly improved. The VUV lamp output was 2.8 x 1015 photons s-1, which was focused into the small ionization zone, and the ion intensity of gaseous benzene under SPI achieved 1.7 x 104 counts per second per pptv (cps pptv-1). This ion source can also function in photoinduced associative ionization (PAI) mode by introducing gaseous CH2Cl2 to initiate an associative ionization reaction. Because of the high efficiency of the ion source, the amount of doped CH2Cl2 needed for PAI was greatly reduced (~2.5% of that used in previous experiments). PAI exhibited an outstanding protonation effect on monosulfur ethers (CnH2n+1S). The signal intensities of the protonated molecular ions (MH+) were 46-128 times higher than those of the molecular ions (M+) produced by SPI. Since monosulfur ethers generally have lower SPI crosssections than polysulfur ethers (CnH2n+1S2 or CnH2n+1S3), the PAI and SPI modes were selected for the online measurement of a series of mono- and polysulfur ethers, respectively. The obtained detection sensitivity of the mono- and polysulfur ethers reached 476.5 +/- 1.72-2835.1 +/- 99.5 and 47.9 +/- 0.4-105.1 +/- 2.3 counts pptv-1, respectively, in 10 s of sampling time. The corresponding 3 sigma limits of detection (LODs) were 0.12-0.71 and 0.06-0.14 pptv, respectively. This study provides advances in the development of a high-flux VUV lamp and a highly efficient SPI/PAI ion source, as well as an ultrasensitive analytical method for detecting sulfur ethers.
Department大气环境与污染控制实验室 ; 大气环境与污染控制实验室
KeywordSINGLE-PHOTON IONIZATION SOLID-PHASE MICROEXTRACTION ODOR-CAUSING COMPOUNDS GAS-CHROMATOGRAPHY ORGANIC-COMPOUNDS COMPOUNDS VSCS EXCIMER LIGHT AIR WATER GC
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/47384
Collection大气环境与污染控制实验室
Corresponding AuthorYang, Bo
Affiliation1.Univ Chinese Acad Sci, Natl Engn Lab VOCs Pollut Control Mat & Technol, Beijing 101408, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Simulat & Pollut Control, Beijing 100085, Peoples R China
Recommended Citation
GB/T 7714
Guo, Yedong,Wang, Haijie,Yang, Bo,et al. An ultrasensitive SPI/PAI ion source based on a high-flux VUV lamp and its applications for the online mass spectrometric detection of sub-pptv sulfur ethers[J]. TALANTA,2022,247(0):123558.
APA Guo, Yedong.,Wang, Haijie.,Yang, Bo.,Shu, Jinian.,Jiang, Kui.,...&Wei, Zhiyang.(2022).An ultrasensitive SPI/PAI ion source based on a high-flux VUV lamp and its applications for the online mass spectrometric detection of sub-pptv sulfur ethers.TALANTA,247(0),123558.
MLA Guo, Yedong,et al."An ultrasensitive SPI/PAI ion source based on a high-flux VUV lamp and its applications for the online mass spectrometric detection of sub-pptv sulfur ethers".TALANTA 247.0(2022):123558.
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