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

本计画的目的是建立一种使用高时间解析度与高精密度的质子转移反应质谱仪（PTR-MS）来量测大气中挥发性有机化合物（VOCs）的技术。第二个目的是利用PTR-MS技术对城市空气中VOCs的行为进行表征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谱仪定量而不进行裂解。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）技术快得多，后者需要一个多小时来识别VOC种类。为建立环境空气中挥发性有机化合物（VOCs）的PTR-MS检测技术，研究了VOCs零浓度的确定方法 ...更多信息 已经开发了信号和校准检测灵敏度，并且已经仔细校准了灵敏度对环境空气湿度和其他参数的依赖性。此外，还采用GC-FID和扩散洗涤器技术对苯、甲苯、二甲苯和三甲苯（GC-FID）以及甲醛和乙醛（扩散洗涤器）等多种挥发性有机物进行了同时测定，结果基本一致。和含氧VOC（甲醛、乙醛、丙酮、甲醇等）利用这些资料研究了大气环流的日变化和季节变化。在各种VOCs中，甲醛和乙醛表现出明显的日变化，在夏季中午前后达到最大值。通过去除一次排放的贡献，使用与CO的相关性，光化学生产的贡献估计为70-80%，在夏季。次级生产量和O3+NO2浓度之间的良好相关性证实了这些增强是由于光化学。这些新发现已在2005年9月的Gordon Research Conference等国内外会议上发表。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