VUV照明生成C2H5O+并掺杂丙醛增强检测气相甲醛。

IF 2.7 2区 化学 Q2 BIOCHEMICAL RESEARCH METHODS
Zhiyang Wei, , , Lixin Shan, , , Yongze Gao, , , Zhiyuan Luo, , , Shiyu Cheng, , and , Jinian Shu*, 
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引用次数: 0

摘要

甲醛(CH2O)具有致癌性和致畸性,是室内主要的有机污染物之一。然而,由于CH2O的高电离能,它一直是普通VUV灯光电离质谱(PI-MS)检测不到的物质。在本文中,我们报道了一种通过监测在VUV照明下形成并通过掺杂丙醛增强的C2H5O+ (m/z 45)来检测气相CH2O的质谱技术。在约1300 Pa的氮气或合成空气中,用VUV照射ppm级CH2O,观察到m/z 45处独特的质量峰。通过高分辨率质谱测量和氘核转移实验的验证,m/z 45离子被确定为C2H5O+。实验中观察到的C2H5O+离子的形成过程与本文讨论的碳氢化合物燃烧过程中C2H5O+的形成过程相似。载气中掺入丙醛后,C2H5O+的信号强度显著提高了近13倍。C2H5O+对CH2O的检测灵敏度达到46.0计数ppb-1, LOD为4.3 ppb,掺杂丙醛后检测灵敏度提高。使用干燥剂可以缓解湿度对检测的影响,在100% RH条件下,以CaCl2·2H2O为干燥剂的回收率达到30%的干燥条件。实验证明m/ z45离子可以作为CH2O检测的特征离子。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Detection of Gas-Phase Formaldehyde via C2H5O+ Produced by VUV Illumination and Enhanced by Doping Propionaldehyde

Detection of Gas-Phase Formaldehyde via C2H5O+ Produced by VUV Illumination and Enhanced by Doping Propionaldehyde

Formaldehyde (CH2O) is one of the main indoor organic pollutants due to its carcinogenicity and teratogenicity. However, CH2O has been an undetectable species for common VUV lamp-based photoionization mass spectrometry (PI-MS) due to its high ionization energy. In this article, we report a mass spectrometric technique developed for detecting gas-phase CH2O by monitoring C2H5O+ (m/z 45) formed in VUV illumination and enhanced by doping propionaldehyde. The unique mass peak at m/z 45 was observed by VUV illuminating ppm-level CH2O in ∼1300 Pa of nitrogen or synthetic air. The m/z 45 ion was assigned to be C2H5O+ via verification with a high-resolution mass spectrometric measurement and a deuteron transfer experiment. The formation process of the C2H5O+ ion observed in the experiment is similar to that of C2H5O+ formed in the combustion of hydrocarbons, discussed in the paper. Doping propionaldehyde in the carrier gas remarkably enhanced the signal intensity of C2H5O+ by nearly 13 times. The detection sensitivities of CH2O via C2H5O+ reached 46.0 counts ppb–1, and the LOD of the method was 4.3 ppb, enhanced by doping propionaldehyde. The influence of the humidity on the detection could be alleviated with desiccants, and the recovery with CaCl2·2H2O as the desiccant was achieved at 30% of the dry condition under 100% RH. This experiment demonstrated that the m/z 45 ions can be used as the characteristic ion for detecting CH2O.

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来源期刊
CiteScore
5.50
自引率
9.40%
发文量
257
审稿时长
1 months
期刊介绍: The Journal of the American Society for Mass Spectrometry presents research papers covering all aspects of mass spectrometry, incorporating coverage of fields of scientific inquiry in which mass spectrometry can play a role. Comprehensive in scope, the journal publishes papers on both fundamentals and applications of mass spectrometry. Fundamental subjects include instrumentation principles, design, and demonstration, structures and chemical properties of gas-phase ions, studies of thermodynamic properties, ion spectroscopy, chemical kinetics, mechanisms of ionization, theories of ion fragmentation, cluster ions, and potential energy surfaces. In addition to full papers, the journal offers Communications, Application Notes, and Accounts and Perspectives
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