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Characterization of the organic matter in submicron urban aerosols using a Thermo-Desorption Proton-Transfer-Reaction Time-of-Flight Mass Spectrometer (TD-PTR-TOF-MS)

机译:使用热脱附质子转移反应飞行时间质谱仪(TD-PTR-TOF-MS)表征亚微米城市气溶胶中的有机物

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Organic matter is the most complicated and unresolved major component of atmospheric aerosol particles. Its sources and global budget are still highly uncertain and thereby necessitate further research efforts with state-of-the-art instrument. This study employed a Thermo-Desorption Proton-Transfer Reaction Time-of-Flight Mass Spectrometer (TD-PTR-TOF-MS) for characterization of ambient organic aerosols. First, five authentic standard substances, which include phthalic acid, levoglucosan, arabitol, cis-pinonic acid and glutaric acid, were utilized to examine the response of the instrument. The results demonstrated the linearity of the TD-PTR-TOF-MS signals against a range of mass loading of specific species on filters. However, it was found that significant fragmentation happened to those challenging compounds, although the proton-transfer-reaction (PTR) was recognized as a soft ionization technique. Consequently, quantitative characterization of aerosols with the TD-PTR-TOF-MS depended on the availability of the fragmentation pattern in mass spectra and the recovery rate with the quantification ion peak(s). The instrument was further deployed to analyze a subset of submicron aerosol samples collected at.the TARO (Taipei Aerosol and Radiation Observatory) in Taipei, Taiwan during August 2013. The results were compared with the measurements from a conventional DRI thermo-optical carbon analyzer. The inter-comparison indicated that the TD-PTR-TOF-MS underestimated the mass of total organic matter (TOM) in aerosol samples by 27%. The underestimation was most likely due to the thermodecomposition during desorption processes and fragmentation in PTR drift tube, where undetectable fragments were formed. Besides, condensation loss of low vapor pressure species in the transfer
机译:有机物是大气气溶胶颗粒中最复杂且尚未解决的主要成分。它的来源和全球预算仍然高度不确定,因此需要使用最先进的仪器进行进一步的研究。这项研究采用了热脱附质子转移飞行时间质谱仪(TD-PTR-TOF-MS)来表征环境有机气溶胶。首先,使用五种真实的标准物质(包括邻苯二甲酸,左旋葡聚糖,阿拉伯糖醇,顺式羽绒酸和戊二酸)检查仪器的响应。结果证明了TD-PTR-TOF-MS信号相对于特定物种在过滤器上的质量负载范围具有线性。然而,尽管质子转移反应(PTR)被认为是一种软电离技术,但发现这些具有挑战性的化合物发生了显着的碎片化。因此,用TD-PTR-TOF-MS进行气溶胶的定量表征取决于质谱图中碎片图谱的可用性以及定量离子峰的回收率。该仪器被进一步部署用于分析2013年8月在台湾台北的TARO(台北气溶胶和辐射观测所)收集的亚微米气溶胶样品的子集。将结果与传统DRI热光碳分析仪的测量结果进行比较。相互比较表明,TD-PTR-TOF-MS低估了气溶胶样品中总有机物(TOM)的质量27%。低估的原因很可能是由于解吸过程中的热分解和PTR漂移管中的碎裂(在碎裂中形成了无法检测的碎屑)。此外,在转移过程中低蒸气压物质的冷凝损失

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