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A quantitative study of biogenic volatile organic compounds using proton transfer reaction linear ion trap mass spectrometry.

机译:使用质子转移反应线性离子阱质谱对生物挥发性有机物进行定量研究。

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摘要

Currently, proton-transfer reaction mass spectrometry (PTR-MS) allows for quantitative determination of volatile organic compounds in real time at concentrations in the low ppt range, but cannot differentiate isomers or isobaric molecules, using the conventional quadrupole mass filter. Here we pursue the application of linear quadrupole ion trap (LIT) mass spectrometry in combination with proton-transfer reaction chemical ionization to provide the advantages of specificity from MS/MS. A commercial PTR-MS platform composed of a quadrupole mass filter with the addition of end cap electrodes enabled the mass filter to operate as a linear ion trap. The utility of the PTR-LIT was demonstrated by distinguishing between the isomeric isoprene oxidation pair, methyl vinyl ketone (MVK) and methacrolein (MACR) in a photochemical reactor and in ambient forest conditions with 100 ppt LOD. The PTR-LIT method was compared to an established GC/MS method by quantifying MVK and MACR and with a QqQ-MS for distinguishing several monoterpenes and sesquiterpenes. The role of isoprene and its oxidation products, monoterpenes, sesquiterpenes, hydrocarbons, and aromatics was determined in terms of aerosol production and growth, and the formation of organic nitrates from the reaction of VOC with OH or NO3.
机译:当前,质子转移反应质谱法(PTR-MS)允许实时定量测定低ppt范围内的挥发性有机化合物,但不能使用常规的四极杆质量滤器区分异构体或同量异位分子。在这里,我们追求结合质子转移反应化学电离的线性四极离子阱(LIT)质谱的应用,以提供MS / MS的特异性优势。由四极质量过滤器和端盖电极组成的商用PTR-MS平台使质量过滤器可以用作线性离子阱。 PTR-LIT的用途通过在光化学反应器和森林环境中具有100 ppt LOD的异构异戊二烯氧化对,甲基乙烯基酮(MVK)和甲基丙烯醛(MACR)之间进行区分来证明。通过定量MVK和MACR以及使用QqQ-MS来区分几种单萜和倍半萜烯,将PTR-LIT方法与已建立的GC / MS方法进行了比较。异戊二烯及其氧化产物,单萜,倍半萜烯,碳氢化合物和芳香族化合物的作用取决于浮质的产生和生长,以及VOC与OH或NO3的反应形成有机硝酸盐。

著录项

  • 作者

    Mielke, Levi H.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Atmospheric Chemistry.Environmental Sciences.Chemistry Analytical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 250 p.
  • 总页数 250
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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