Measurements of volatile organic compounds in urban air using proton-transfer-reaction mass spectrometer

使用质子转移反应质谱仪测量城市空气中的挥发性有机化合物

• 批准号: 15310009
• 负责人: KOIKE Makoto
• 金额: $ 9.86万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15310009/
• 关键词: VOC; proton-transfer-reaction

The purpose of this project is to establish a technique to measure volatile organic compounds (VOCs) in the atmosphere using a proton-transfer-reaction mass spectrometer (PTR-MS) with a high time resolution and high precision. The second purpose is to characterize behaviors of VOCs in urban air based on VOC measurements using the PTR-MS.The PTR-MS technique is based on proton-transfer-reaction between target species (VOCs in this case) and proton hydrate (H3O+), which is produced in the instrument.H_3O^+ + VOC → H_2O + VOC H^+Because of this soft ionization of the target species, they can generally be quantified by mass spectrometer without making fragmentation. Using this method, VOCs can be measured with a time resolution of seconds, which is much faster than the conventional gas-chromatography (GC) technique, which require more than an hour to identify VOC species. To establish the PTR-MS technique to measure VOCs in ambient air in this study, methods to determine the zero level of … More the signal and calibrate the detection sensitivity have been developed, and dependence of sensitivity on the humidity of ambient air and other parameters have been carefully calibrated. Simultaneous measurements of various VOCs have also been made with GC-FID and diffusion scrubber techniques, such as benzene, toluene, xylene, and tri-methyl benzene (GC-FID) and formaldehyde and acetaldehyde (diffusion scrubber), respectively, and generally a good agreement was found.In this study, to characterize behaviors of VOCs in mega-city Tokyo, a series of measurements of VOCs (benzene, toluene, xylene, etc.) and oxygenated VOCs (formaldehyde, acetaldehyde, acetone, methanol, etc.) was made using the PTR-MS. A diurnal and seasonal variations have been studied using these data. Among various VOCs, formaldehyde and acetaldehyde show a clear diurnal variation with a maximum around noon in summer. By removing a contribution from primary emissions using a correlation with CO, a contribution from photochemical production was estimated to be 70-80% in summer. A good correlation between the secondary production amounts and O3+NO2 concentrations confirmed these enhancements were due to photochemistry. Possible processes of secondary production were studied using a box model.These new findings have been reported in various domestic and international conferences, such as Gordon Research Conference in September 2005. Less

该项目的目的是建立一种使用具有高时间分辨率和高精度的质子转移反应质谱仪（PTR-MS）测量大气中挥发性有机化合物（VOC）的技术。第二个目的是使用 PTR-MS 根据 VOC 测量来表征城市空气中 VOC 的行为。PTR-MS 技术基于目标物质（本例中为 VOC）与仪器中产生的质子水合物 (H3O+) 之间的质子转移反应。H_3O^+ + VOC → H_2O + VOC H^+ 由于目标物质的这种软电离，它们通常可以通过质量进行量化 光谱仪不产生碎片。使用这种方法，可以以秒的时间分辨率测量VOC，这比传统的气相色谱（GC）技术要快得多，传统的气相色谱（GC）技术需要一个多小时才能识别VOC种类。为了在本研究中建立测量环境空气中 VOC 的 PTR-MS 技术，开发了确定信号零水平和校准检测灵敏度的方法，并仔细校准了灵敏度对环境空气湿度和其他参数的依赖性。还使用 GC-FID 和扩散洗涤器技术同时测量了各种 VOC，例如苯、甲苯、二甲苯和三甲基苯 (GC-FID) 以及甲醛和乙醛（扩散洗涤器），并且总体上发现了良好的一致性。在本研究中，为了表征大城市东京的 VOC 行为， 使用 PTR-MS 对 VOC（苯、甲苯、二甲苯等）和含氧 VOC（甲醛、乙醛、丙酮、甲醇等）进行了一系列测量。使用这些数据研究了昼夜和季节变化。各种VOC中，甲醛和乙醛表现出明显的日变化，夏季中午左右达到最大值。通过使用与 CO 的相关性去除一次排放的贡献，光化学产生的贡献估计在夏季为 70-80%。二次生产量和 O3+NO2 浓度之间良好的相关性证实了这些增强是由于光化学作用。使用盒子模型研究了二次生产的可能过程。这些新发现已在各种国内外会议上报道，例如2005年9月的戈登研究会议。更少

项目成果

In situ HNO_3 to NOy instrument comparison during SOLVE

SOLVE 期间原位 HNO_3 与 NOy 仪器比较

• 发表时间: 2003
• 期刊: J.Geophys.Res. 108(D6)
• 作者: Ballenthin;J.O;W.F.Thorn;M.Koike;N.Takegawa;他6名
• 通讯作者: 他6名

Measurement of NO_2 by the photolysis conversion technique during the Transport and Chemical Evolution Over the Pacific (TRACE-P) campaign

太平洋运输和化学演化（TRACE-P）活动期间采用光解转化技术测量 NO_2

• 发表时间: 2003
• 期刊: J.Geophys.Res. 108(D24)
• 作者: Nakamura;K;Y.Kondo;N.Takegawa;M.Koike;K.Kita;他7名
• 通讯作者: 他7名

Impacts of biomass burning in Southeast Asia on ozone and reactive nitrogen over the western Pacific in spring

• DOI: 10.1029/2003jd004203
• 发表时间: 2004-08
• 期刊: Journal of Geophysical Research
• 作者: Y. Kondo;Y. Morino;N. Takegawa;M. Koike;K. Kita;Y. Miyazaki;G. Sachse;S. Vay;M. Avery;F. F

Photochemistry of ozone over the western Pacific from winter to spring

• DOI: 10.1029/2004jd004871
• 发表时间: 2004-12
• 期刊: Journal of Geophysical Research
• 作者: Y. Kondo;Kazuaki Nakamura;Guimin Chen;N. Takegawa;M. Koike;Y. Miyazaki;K. Kita;J. Crawford;M. Ko;D. Blake;S. Kawakami;T. Shirai;B. Liley;Yang Wang;T. Ogawa

Export of anthropogenic reactive nitrogen and sulfur compounds from the East Asia region in spring

• DOI: 10.1029/2002jd003284
• 发表时间: 2003-10
• 期刊: Journal of Geophysical Research
• 作者: M. Koike;Y. Kondo;K. Kita;N. Takegawa;Y. Masui;Y. Miyazaki;M. Ko;A. Weinheimer;F. Flocke;R. Weber;D. Thornton;G. Sachse;S. Vay;D. Blake;D. Streets;F. Eisele;S. Sandholm;H. Singh;R. Talbot