Quantitative determination of biogenic volatile organic compounds in the atmosphere using proton-transfer reaction linear ion trap mass spectrometry.
Quantitative determination of biogenic volatile organic compounds in the atmosphere using proton-transfer reaction linear ion trap mass spectrometry.
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DOI：
10.1021/ac1014244
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发表时间：
2010-09
影响因子：
7.4
通讯作者：
L. Mielke;K. Pratt;P. Shepson;S. A. McLuckey;A. Wisthaler;A. Hansel
中科院分区：
文献类型：
--
作者：
L. Mielke;K. Pratt;P. Shepson;S. A. McLuckey;A. Wisthaler;A. Hansel
虽然生物挥发性有机化合物（BVOCs）的氧化在对流层臭氧和二次有机气溶胶的产生中起着重要的作用，但我们对BVOCs对臭氧，气溶胶和气候的影响的理解仍然存在重大的不确定性。为了定量BVOCs，质子转移反应线性离子阱（PTR-LIT）质谱仪是以前开发的。PTR-LIT代表了对更传统技术（包括质子转移反应质谱仪）的改进，提供了通过MS/MS分析直接定量和区分异构化合物的能力，与气相色谱技术相比，具有更好的时间分辨率和最少的样品处理。在此，我们提出的结果从第一个现场部署的PTR-LIT. During氧化剂的研究计划：光化学，排放和运输（PROPHET）2008年夏季研究在密歇根州北方，PTR-LIT成功地量化异戊二烯，总单萜，异戊二烯氧化产物甲基乙烯基酮和异丁烯醛的异构体在分十亿分之一（纳摩尔/摩尔）的水平在一个复杂的森林大气。PTR-LIT的快速时间响应的效用示出了通过测量异戊二烯，甲基乙烯基酮，和甲基丙烯醛的快速变化，同时改变臭氧摩尔分数。总体而言，PTR-LIT被证明是一个可行的现场仪器，具有必要的灵敏度，选择性和时间响应，以提供详细的测量复杂的大气样品中的BVOC摩尔分数，在痕量水平。
Although oxidation of biogenic volatile organic compounds (BVOCs) plays an important role in tropospheric ozone and secondary organic aerosol production, significant uncertainties remain in our understanding of the impacts of BVOCs on ozone, aerosols, and climate. To quantify BVOCs, the proton-transfer reaction linear ion trap (PTR-LIT) mass spectrometer was previously developed. The PTR-LIT represents an improvement over more traditional techniques (including the proton-transfer reaction mass spectrometer), providing the capability to directly quantify and differentiate isomeric compounds by MS/MS analysis, with better time resolution and minimal sample handling, compared to gas chromatography techniques. Herein, we present results from the first field deployment of the PTR-LIT. During the Program for Research on Oxidants: Photochemistry, Emissions and Transport (PROPHET) summer 2008 study in northern Michigan, the PTR-LIT successfully quantified isoprene, total monoterpenes, and isomeric isoprene oxidation products methyl vinyl ketone and methacrolein at sub-parts per billion (nmol/mol) levels in a complex forest atmosphere. The utility of the fast time response of the PTR-LIT was shown by the measurement of rapid changes in isoprene, methyl vinyl ketone, and methacrolein, concurrent with changing ozone mole fractions. Overall, the PTR-LIT was shown to be a viable field instrument with the necessary sensitivity, selectivity, and time response to provide detailed measurements of BVOC mole fractions in complex atmospheric samples, at trace levels.